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  • Fast JSON serialization (and comparison with Pickle) for cluster computing in Python?

    - by user248237
    I have a set of data points, each described by a dictionary. The processing of each data point is independent and I submit each one as a separate job to a cluster. Each data point has a unique name, and my cluster submission wrapper simply calls a script that takes a data point's name and a file describing all the data points. That script then accesses the data point from the file and performs the computation. Since each job has to load the set of all points only to retrieve the point to be run, I wanted to optimize this step by serializing the file describing the set of points into an easily retrievable format. I tried using JSONpickle, using the following method, to serialize a dictionary describing all the data points to file: def json_serialize(obj, filename, use_jsonpickle=True): f = open(filename, 'w') if use_jsonpickle: import jsonpickle json_obj = jsonpickle.encode(obj) f.write(json_obj) else: simplejson.dump(obj, f, indent=1) f.close() The dictionary contains very simple objects (lists, strings, floats, etc.) and has a total of 54,000 keys. The json file is ~20 Megabytes in size. It takes ~20 seconds to load this file into memory, which seems very slow to me. I switched to using pickle with the same exact object, and found that it generates a file that's about 7.8 megabytes in size, and can be loaded in ~1-2 seconds. This is a significant improvement, but it still seems like loading of a small object (less than 100,000 entries) should be faster. Aside from that, pickle is not human readable, which was the big advantage of JSON for me. Is there a way to use JSON to get similar or better speed ups? If not, do you have other ideas on structuring this? (Is the right solution to simply "slice" the file describing each event into a separate file and pass that on to the script that runs a data point in a cluster job? It seems like that could lead to a proliferation of files). thanks.

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  • Working with foreigh keys - cannot insert

    - by Industrial
    Hi everyone! Doing my first tryouts with foreign keys in a mySQL database and are trying to do a insert, that fails for this reason: Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails Does this mean that foreign keys restrict INSERTS as well as DELETES and/or UPDATES on each table that is enforced with foreign keys relations? Thanks!

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  • How to best show progress info when using ADO.NET?

    - by Yadyn
    I want to show the user detailed progress information when performing potentially lengthy database operations. Specifically, when inserting/updating data that may be on the order of hundreds of KB or MB. Currently, I'm using in-memory DataTables and DataRows which are then synced with the database via TableAdapter.Update calls. This works fine and dandy, but the single call leaves little opportunity to glean any kind of progress info to show to the user. I have no idea how much data is passing through the network to the remote DB or its progress. Basically, all I know is when Update returns and it is assumed complete (barring any errors or exceptions). But this means all I can show is 0% and then a pause and then 100%. I can count the number of rows, even going so far to cound how many are actually Modified or Added, and I could even maybe calculate per DataRow its estimated size based on the datatype of each column, using sizeof for value types like int and checking length for things like strings or byte arrays. With that, I could probably determine, before updating, an estimated total transfer size, but I'm still stuck without any progress info once Update is called on the TableAdapter. Am I stuck just using an indeterminate progress bar or mouse waiting cursor? Would I need to radically change our data access layer to be able to hook into this kind of information? Even if I can't get it down to the precise KB transferred (like a web browser file download progress bar), could I at least know when each DataRow/DataTable finishes or something? How do you best show this kind of progress info using ADO.NET?

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  • NHibernate query CreateCriteria

    - by Jacob
    Is it possible to chose what columns I want in return from Session.CreateCriteria() ? egz.: var x = session.CreateCriteria(); x.CreateAlias("EmployeePosition", "employeePosition"); x.Add(Restrictions.Eq("employeePosition.Name", "Developer")); and is there a way to add something like "select LastName" to avoid downloading the whole row.

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  • Codeigniter: Using URIs with forms

    - by Kevin Brown
    I'm using URIs to direct a function in a library: $id = $this->CI->session->userdata('id'); $URI = $this->CI->uri->uri_string(); $new = "new"; if(strpos($URI, $new) === FALSE){ $method = "update"; } elseif(strpos($URI, $new) !== FALSE){ $method = "create"; } So I have two if statements directing what information to if ($method === 'update') { // Modify form, first load $this->CI->db->from('be_survey'); $this->CI->db->where('user_id' , $id); $survey = $this->CI->db->get(); $user = array_merge($user->row_array(),$survey->row_array()); $this->CI->validation->set_default_value($user); // Display page $data['user'] = $user; } $this->CI->validation->set_rules($rules); if ( $this->CI->validation->run() === FALSE ) { // Output any errors $this->CI->validation->output_errors(); } else { // Submit form $this->_submit($method); } Submit function: function _submit($method) { //Submit and Update for current User $id = $this->CI->session->userdata('id'); $this->CI->db->select('users.id, users.username, users.email, profiles.firstname, profiles.manager_id'); $this->CI->db->from('be_users' . " users"); $this->CI->db->join('be_user_profiles' . " profiles",'users.id=profiles.user_id'); $this->CI->db->having('id', $id); $email_data['user'] = $this->CI->db->get(); $email_data['user'] = $email_data['user']->row(); $manager_id = $email_data['user']->manager_id; $this->CI->db->select('firstname','email')->from('be_user_profiles')->where('user_id', $manager_id); $email_data['manager'] = $this->CI->db->get(); $email_data['manager'] = $email_data['manager']->row(); // Fetch what they entered in the form for($i=1;$i<18;$i++){ $survey["a_".$i]= $this->CI->input->post('a_'.$i); } for($i=1;$i<15;$i++){ $survey["b_".$i]= $this->CI->input->post('b_'.$i); } for($i=1;$i<12;$i++){ $survey["c_".$i]= $this->CI->input->post('c_'.$i); } $profile['firstname'] = $this->CI->input->post('firstname'); $profile['lastname'] = $this->CI->input->post('lastname'); $profile['test_date'] = date ("Y-m-d H:i:s"); $profile['company_name'] = $this->CI->input->post('company_name'); $profile['company_address'] = $this->CI->input->post('company_address'); $profile['company_city'] = $this->CI->input->post('company_city'); $profile['company_phone'] = $this->CI->input->post('company_phone'); $profile['company_state'] = $this->CI->input->post('company_state'); $profile['company_zip'] = $this->CI->input->post('company_zip'); $profile['job_title'] = $this->CI->input->post('job_title'); $profile['job_type'] = $this->CI->input->post('job_type'); $profile['job_time'] = $this->CI->input->post('job_time'); $profile['department'] = $this->CI->input->post('department'); $profile['vision'] = $this->CI->input->post('vision'); $profile['height'] = $this->CI->input->post('height'); $profile['weight'] = $this->CI->input->post('weight'); $profile['hand_dominance'] = $this->CI->input->post('hand_dominance'); $profile['areas_of_fatigue'] = $this->CI->input->post('areas_of_fatigue'); $profile['job_description'] = $this->CI->input->post('job_description'); $profile['injury_review'] = $this->CI->input->post('injury_review'); $profile['job_positive'] = $this->CI->input->post('job_positive'); $profile['risk_factors'] = $this->CI->input->post('risk_factors'); $profile['job_improvement_short'] = $this->CI->input->post('job_improvement_short'); $profile['job_improvement_long'] = $this->CI->input->post('job_improvement_long'); if ($method == "update") { //Begin db transmission $this->CI->db->trans_begin(); $this->CI->home_model->update('Survey',$survey, array('user_id' => $id)); $this->CI->db->update('be_user_profiles',$profile, array('user_id' => $id)); if ($this->CI->db->trans_status() === FALSE) { flashMsg('error','There was a problem entering your test! Please contact an administrator.'); redirect('survey','location'); } else { //Get credits of user and subtract 1 $this->CI->db->set('credits', 'credits -1', FALSE); $this->CI->db->update('be_user_profiles',$profile, array('user_id' => $manager_id)); //Mark the form completed. $this->CI->db->set('test_complete', '1'); $this->CI->db->where('user_id', $id)->update('be_user_profiles'); // Stuff worked... $this->CI->db->trans_commit(); //Get Manager Information $this->CI->db->select('users.id, users.username, users.email, profiles.firstname'); $this->CI->db->from('be_users' . " users"); $this->CI->db->join('be_user_profiles' . " profiles",'users.id=profiles.user_id'); $this->CI->db->having('id', $email_data['user']->manager_id); $email_data['manager'] = $this->CI->db->get(); $email_data['manager'] = $email_data['manager']->row(); //Email User $this->CI->load->library('User_email'); $data_user = array( 'firstname'=>$email_data['user']->firstname, 'email'=> $email_data['user']->email, 'user_completed'=>$email_data['user']->firstname, 'site_name'=>$this->CI->preference->item('site_name'), 'site_url'=>base_url() ); //Email Manager $data_manager = array( 'firstname'=>$email_data['manager']->firstname, 'email'=> $email_data['manager']->email, 'user_completed'=>$email_data['user']->firstname, 'site_name'=>$this->CI->preference->item('site_name'), 'site_url'=>base_url() ); $this->CI->user_email->send($email_data['manager']->email,'Completed the Assessment Tool','public/email_manager_complete',$data_manager); $this->CI->user_email->send($email_data['user']->email,'Completed the Assessment Tool','public/email_user_complete',$data_user); flashMsg('success','You finished the assessment successfully!'); redirect('home','location'); } } //Create New User elseif ($method == "create") { // Build $profile['user_id'] = $id; $profile['manager_id'] = $manager_id; $profile['test_complete'] = '1'; $survey['user_id'] = $id; $this->CI->db->trans_begin(); // Add user_profile details to DB $this->CI->db->insert('be_user_profiles',$profile); $this->CI->db->insert('be_survey',$survey); if ($this->CI->db->trans_status() === FALSE) { // Registration failed $this->CI->db->trans_rollback(); flashMsg('error',$this->CI->lang->line('userlib_registration_failed')); redirect('auth/register','location'); } else { // User registered $this->CI->db->trans_commit(); flashMsg('success',$this->CI->lang->line('userlib_registration_success')); redirect($this->CI->config->item('userlib_action_register'),'location'); } } } The submit function is similar, updating the db if $method == "update", and inserting if the method == "create". The problem is, when the form is submitted, it doesn't take into account the url b/c the form submits to the function "survey", which passes data to the lib function, so things are always updated, never created. *How can I pass $method to the _submit() function correctly?!*

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  • Stall in animation

    - by tech74
    Hi , I am using this code from this site http://ramin.firoozye.com/2009/09/29/semi-modal-transparent-dialogs-on-the-iphone/ to show a modal view and remove it. It displays fine ie drops in from the top but when being removed it stalls just on its way out just for a fraction of second but its noticeable how do i get rid of the stall. The view i am showing is view of a viewcontroller which is a memeber of the parent viewcontroller so i call methods like this to display [self showModal:self.modalController.view] to hide [self hideModal:self.modalController.view]; (void) showModal:(UIView*) modalView { UIWindow* mainWindow = (((SessionTalkAppDelegate*) [UIApplication sharedApplication].delegate).window); //CGPoint middleCenter = modalView.center; CGPoint middleCenter = CGPointMake(160, 205); CGSize offSize = [UIScreen mainScreen].bounds.size; //CGPoint offScreenCenter = CGPointMake(offSize.width / 2.0, offSize.height * 1.5); CGPoint offScreenCenter = CGPointMake(offSize.width / 2.0, -100); // start from top modalView.center = offScreenCenter; // we start off-screen [mainWindow addSubview:modalView]; // Show it with a transition effect [UIView beginAnimations:nil context:nil]; [UIView setAnimationDuration:0.3]; // animation duration in seconds [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; modalView.center = middleCenter; [UIView commitAnimations]; } // Use this to slide the semi-modal back up. - (void) hideModal:(UIView*) modalView { CGSize offSize = [UIScreen mainScreen].bounds.size; //CGPoint offScreenCenter = CGPointMake(offSize.width / 2.0, offSize.height * 1.5); CGPoint offScreenCenter = CGPointMake(offSize.width / 2.0, -100); [UIView beginAnimations:nil context:modalView]; [UIView setAnimationDuration:0.3]; [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut]; [UIView setAnimationDelegate:self]; [UIView setAnimationDidStopSelector:@selector(hideModalEnded:finished:context:)]; modalView.center = offScreenCenter; [UIView commitAnimations]; } (void) hideModalEnded:(NSString *)animationID finished:(NSNumber *)finished context:(void )context { UIView modalView = (UIView *)context; [modalView removeFromSuperview]; //[modalView release]; }

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  • Linq for java

    - by Milhous
    Would a LINQ for java be a useful tool? I have been working on a tool that will allow a java object to map to a row in a database. Would this be useful for java programmers? What features would be useful?

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  • Should We Mask Passwords?

    - by Abi Noda
    From Jacob Nielson's "Stop Password Masking": Usability suffers when users type in passwords and the only feedback they get is a row of bullets. Typically, masking passwords doesn't even increase security, but it does cost you business due to login failures. What do you guys think?

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  • CDI SessionScoped Bean instance remains unchanged when login with different user

    - by Jason Yang
    I've been looking for the workaround of this problem for rather plenty of time and no result, so I ask question here. Simply speaking, I'm using a CDI SessionScoped Bean User in my project to manage user information and display them on jsf pages. Also container-managed j_security_check is used to resolve authentication issue. Everything is fine if first logout with session.invalidate() and then login in the same browser tab with a different user. But when I tried to directly login (through login.jsf) with a new user without logout beforehand, I found the user information remaining unchanged. I debugged and found the User bean, as well as the HttpSession instance, always remaining the same if login with different users in the same browser, as long as session.invalidate() not invoked. But oddly, the session id did modified, and I've both checked in Java code and Firebug. org.apache.catalina.session.StandardSessionFacade@5d7b4092 StandardSession[c69a71d19f369d08b5dddbea2ef0] attrName = org.jboss.weld.context.conversation.ConversationIdGenerator : attrValue=org.jboss.weld.context.conversation.ConversationIdGenerator@583c9dd8 attrName = org.jboss.weld.context.ConversationContext.conversations : attrValue = {} attrName = org.jboss.weld.context.http.HttpSessionContext#org.jboss.weld.bean-Discipline-ManagedBean-class com.netease.qa.discipline.profile.User : attrValue = Bean: Managed Bean [class com.netease.qa.discipline.profile.User] with qualifiers [@Any @Default @Named]; Instance: com.netease.qa.discipline.profile.User@c497c7c; CreationalContext: org.jboss.weld.context.CreationalContextImpl@739efd29 attrName = javax.faces.request.charset : attrValue = UTF-8 org.apache.catalina.session.StandardSessionFacade@5d7b4092 StandardSession[c6ab4b0c51ee0a649ef696faef75] attrName = org.jboss.weld.context.conversation.ConversationIdGenerator : attrValue = org.jboss.weld.context.conversation.ConversationIdGenerator@583c9dd8 attrName = com.sun.faces.renderkit.ServerSideStateHelper.LogicalViewMap : attrValue = {-4968076393130137442={-7694826198761889564=[Ljava.lang.Object;@43ff5d6c}} attrName = org.jboss.weld.context.ConversationContext.conversations : attrValue = {} attrName = org.jboss.weld.context.http.HttpSessionContext#org.jboss.weld.bean-Discipline-ManagedBean-class com.netease.qa.discipline.profile.User : attrValue = Bean: Managed Bean [class com.netease.qa.discipline.profile.User] with qualifiers [@Any @Default @Named]; Instance: com.netease.qa.discipline.profile.User@c497c7c; CreationalContext: org.jboss.weld.context.CreationalContextImpl@739efd29 attrName = javax.faces.request.charset : attrValue = UTF-8 Above block contains two successive logins and their Session info. We can see that the instance(1st row) the same while session id(2nd row) different. Seems that session object is reused to contain different session id and CDI framework manages session bean life cycle in accordance with the session object only(?). I'm wondering whether there could be only one server-side session object within the same browser unless invalidated? Since I'm adopting j_security_check I fancy intercepting it and invalidating old session is not so easy. So is it possible to accomplish the goal without altering the CDI+JSF+j_security_check design that one can relogin with different account in the same or different tab within the same browser? Really look forward for your response. More info: Glassfish v3.1 is my appserver.

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  • asp.net grid view hyper link pass values to new window

    - by srihari
    hai guys here is my question please help me I have a gridview with hyperlink fields here my requirement is if I click on hyperlink of particular row I need to display that particular row values into other page in that page user will edit record values after that if he clicks on update button I need to update that record values and get back to previous home page. if iam clicking hyper link in first window new window should open with out any url tool bar and minimize close buttons like popup modular Ajax ModalPopUpExtender but iam un able to ge that that one please help me the fillowing code is defalut.aspx <head runat="server"> <title>PassGridviewRow values </title> <style type="text/css"> #gvrecords tr.rowHover:hover { background-color:Yellow; font-family:Arial; } </style> </head> <body> <form id="form1" runat="server"> <div> <asp:GridView runat="server" ID="gvrecords" AutoGenerateColumns="false" HeaderStyle-BackColor="#7779AF" HeaderStyle-ForeColor="White" DataKeyNames="UserId" RowStyle-CssClass="rowHover"> <Columns> <asp:TemplateField HeaderText="Change Password" > <ItemTemplate> <a href ='<%#"UpdateGridviewvalues.aspx?UserId="+DataBinder.Eval(Container.DataItem,"UserId") %>'> <%#Eval("UserName") %> </a> </ItemTemplate> </asp:TemplateField> <asp:BoundField DataField="FirstName" HeaderText="FirstName" /> <asp:BoundField DataField="LastName" HeaderText="LastName" /> <asp:BoundField DataField="Email" HeaderText="Email" /> </Columns> </asp:GridView> </div> </form> </body> </html> following code default.aspx.cs code using System; using System.Collections.Generic; using System.Data; using System.Data.SqlClient; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { BindGridview(); } } protected void BindGridview() { SqlConnection con = new SqlConnection("Data Source=.;Integrated Security=SSPI;Initial Catalog=testdb1"); con.Open(); SqlCommand cmd = new SqlCommand("select * from UserDetails", con); SqlDataAdapter da = new SqlDataAdapter(cmd); cmd.ExecuteNonQuery(); con.Close(); DataSet ds = new DataSet(); da.Fill(ds); gvrecords.DataSource = ds; gvrecords.DataBind(); } } this is updategridviewvalues.aspx <head runat="server"> <title>Update Gridview Row Values</title> <script type="text/javascript"> function Showalert(username) { alert(username + ' details updated successfully.'); if (alert) { window.location = 'Default.aspx'; } } </script> </head> <body> <form id="form1" runat="server"> <div> <table> <tr> <td colspan="2" align="center"> <b> Edit User Details</b> </td> </tr> <tr> <td> User Name: </td> <td> <asp:Label ID="lblUsername" runat="server"/> </td> </tr> <tr> <td> First Name: </td> <td> <asp:TextBox ID="txtfname" runat="server"></asp:TextBox> </td> </tr> <tr> <td> Last Name: </td> <td> <asp:TextBox ID="txtlname" runat="server"></asp:TextBox> </td> </tr> <tr> <td> Email: </td> <td> <asp:TextBox ID="txtemail" runat="server"></asp:TextBox> </td> </tr> <tr> <td> </td> <td> <asp:Button ID="btnUpdate" runat="server" Text="Update" onclick="btnUpdate_Click" /> <asp:Button ID="btnCancel" runat="server" Text="Cancel" onclick="btnCancel_Click"/> </td> </tr> </table> </div> </form> </body> </html> and my updategridviewvalues.aspx.cs code is follows using System; using System.Collections.Generic; using System.Data; using System.Data.SqlClient; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; public partial class UpdateGridviewvalues : System.Web.UI.Page { SqlConnection con = new SqlConnection("Data Source=.;Integrated Security=SSPI;Initial Catalog=testdb1"); private int userid=0; protected void Page_Load(object sender, EventArgs e) { userid = Convert.ToInt32(Request.QueryString["UserId"].ToString()); if(!IsPostBack) { BindControlvalues(); } } private void BindControlvalues() { con.Open(); SqlCommand cmd = new SqlCommand("select * from UserDetails where UserId=" + userid, con); SqlDataAdapter da = new SqlDataAdapter(cmd); cmd.ExecuteNonQuery(); con.Close(); DataSet ds = new DataSet(); da.Fill(ds); lblUsername.Text = ds.Tables[0].Rows[0][1].ToString(); txtfname.Text = ds.Tables[0].Rows[0][2].ToString(); txtlname.Text = ds.Tables[0].Rows[0][3].ToString(); txtemail.Text = ds.Tables[0].Rows[0][4].ToString(); } protected void btnUpdate_Click(object sender, EventArgs e) { con.Open(); SqlCommand cmd = new SqlCommand("update UserDetails set FirstName='" + txtfname.Text + "',LastName='" + txtlname.Text + "',Email='" + txtemail.Text + "' where UserId=" + userid, con); SqlDataAdapter da = new SqlDataAdapter(cmd); int result= cmd.ExecuteNonQuery(); con.Close(); if(result==1) { ScriptManager.RegisterStartupScript(this, this.GetType(), "ShowSuccess", "javascript:Showalert('"+lblUsername.Text+"')", true); } } protected void btnCancel_Click(object sender, EventArgs e) { Response.Redirect("~/Default.aspx"); } } My requirement is new window should come like pop window as new window with out having url and close button my database tables is ColumnName DataType ------------------------------------------- UserId Int(set identity property=true) UserName varchar(50) FirstName varchar(50) LastName varchar(50) Email Varchar(50)

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  • How to set the itemdata in a combox from key value

    - by glinch
    Hi, How would i set the itemdata from getting just the ID/key of a row, if i didnt know what order it is in on the list For example I have a combo box showing the following: cmbPeople: ID Name 2 Rod 4 Jane 6 Freddy eg. I know I want Jane to be the focus of the combo box, and i have the ID but i dont know that its the second item in the list ( Me.cmbPeople.ItemData(1) ) How would I go about doing this?? Thanks in advance for any help

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  • finding the missing values in a range using any scripting language - perl, python or shell script

    - by manu
    Hi everyone I got stuck in one problem of finding the missing values in a range and the range is also variable for the successive rows. Ex. =================== inpt ==================== 673 673 673 676 676 680 2667 2667 2668 2670 2671 2674 ===================== output should be like this =================== 674 675 677 678 679 2669 2672 2673 ======================== This is just one part and the row values can be more also If there is any clarification plz let me know. thanx in advance manu

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  • C# Regex stops after first line matched

    - by JD Guzman
    Ok so I have a regex and I need it to find matches in a multiline string. This is the string I am using: Device Identifier: disk0 Device Node: /dev/disk0 Part of Whole: disk0 Device / Media Name: OCZ-VERTEX2 Media Volume Name: Not applicable (no file system) Mounted: Not applicable (no file system) File System: None Content (IOContent): GUID_partition_scheme OS Can Be Installed: No Media Type: Generic Protocol: SATA SMART Status: Verified Total Size: 240.1 GB (240057409536 Bytes) (exactly 468862128 512-Byte-Blocks) Volume Free Space: Not applicable (no file system) Device Block Size: 512 Bytes Read-Only Media: No Read-Only Volume: Not applicable (no file system) Ejectable: No Whole: Yes Internal: Yes Solid State: Yes OS 9 Drivers: No Low Level Format: Not supported Basically I need to separate each line into two groups with the colon as the separator. The regex I am using is: @"([A-Za-z0-9\(\) \-\/]+):([A-Za-z0-9\(\) \-\/]+).*" It does work but only picks up the first line and separates it into the two groups like I want but it stops at that point. I have tried the Multiline option but it doesn't make any difference. I must admit I am new to the regex world. Any help is appreciated.

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  • Putting update logic in your migrations

    - by Daniel Abrahamsson
    A couple of times I've been in the situation where I've wanted to refactor the design of some model and have ended up putting update logic in migrations. However, as far as I've understood, this is not good practice (especially since you are encouraged to use your schema file for deployment, and not your migrations). How do you deal with these kind of problems? To clearify what I mean, say I have a User model. Since I thought there would only be two kinds of users, namely a "normal" user and an administrator, I chose to use a simple boolean field telling whether the user was an adminstrator or not. However, after I while I figured I needed some third kind of user, perhaps a moderator or something similar. In this case I add a UserType model (and the corresponding migration), and a second migration for removing the "admin" flag from the user table. And here comes the problem. In the "add_user_type_to_users" migration I have to map the admin flag value to a user type. Additionally, in order to do this, the user types have to exist, meaning I can not use the seeds file, but rather create the user types in the migration (also considered bad practice). Here comes some fictional code representing the situation: class CreateUserTypes < ActiveRecord::Migration def self.up create_table :user_types do |t| t.string :name, :nil => false, :unique => true end #Create basic types (can not put in seed, because of future migration dependency) UserType.create!(:name => "BASIC") UserType.create!(:name => "MODERATOR") UserType.create!(:name => "ADMINISTRATOR") end def self.down drop_table :user_types end end class AddTypeIdToUsers < ActiveRecord::Migration def self.up add_column :users, :type_id, :integer #Determine type via the admin flag basic = UserType.find_by_name("BASIC") admin = UserType.find_by_name("ADMINISTRATOR") User.all.each {|u| u.update_attribute(:type_id, (u.admin?) ? admin.id : basic.id)} #Remove the admin flag remove_column :users, :admin #Add foreign key execute "alter table users add constraint fk_user_type_id foreign key (type_id) references user_types (id)" end def self.down #Re-add the admin flag add_column :users, :admin, :boolean, :default => false #Reset the admin flag (this is the problematic update code) admin = UserType.find_by_name("ADMINISTRATOR") execute "update users set admin=true where type_id=#{admin.id}" #Remove foreign key constraint execute "alter table users drop foreign key fk_user_type_id" #Drop the type_id column remove_column :users, :type_id end end As you can see there are two problematic parts. First the row creation part in the first model, which is necessary if I would like to run all migrations in a row, then the "update" part in the second migration that maps the "admin" column to the "type_id" column. Any advice?

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  • Get next record with Core Data

    - by Sebastian
    Hey, I have a tableview which content is managed through core data. When I select a row, a details view is pushed in and shows more information. How can I jump to the next record (the one below the one I selected in the tableview before) through a "next" button in the view ? Same for a previous button, but that should be very similar ... thx a lot ! Sebastian

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  • CSS Menus having cross browser problems

    - by George
    I am trying to solve a problem with a CSS menu where the menu does not display properly in IE 6 I see that the HTML has some conditional code to make it work with different browsers but I do not understand it well enough. Can someone suggest a fix so the selected tab in order displayed without the grey breaK? Thanks! #pad { height: 140px; } .dropline { position: relative; padding-bottom: 0px; list-style-type: none; margin: 0px 0px 0px 5px; padding-left: 0px; width: 860px; padding-right: 0px; background: url(../images/menus/ulback.gif) repeat-x; height: 40px; top: 0px; list-style-image: none; padding-top: 0px; left: 5px; } .dropline TABLE { margin: -3px -10px; width: 25px; border-collapse: collapse; height: 17px; } .dropline LI { margin-bottom: 0px; float: left; } .dropline LI A { padding-bottom: 0px; line-height: 40px; padding-left: 0px; padding-right: 19px; display: block; font-family: tahoma, sans-serif; float: left; height: 40px; color: #fff; font-size: 12px; text-decoration: none; padding-top: 0px; } .dropline A { text-align: right; padding-bottom: 0px; line-height: 40px; padding-left: 0px; padding-right: 19px; font-family: tahoma, sans-serif; float: right; height: 40px; color: #fff; font-size: 12px; text-decoration: none; padding-top: 0px; } .dropline A:hover { color: yellow; } .welcomeuser { text-align: right; padding-bottom: 0px; line-height: 40px; padding-left: 20px; padding-right: 0px; font-family: tahoma, sans-serif; float: right; height: 40px; color: #fff; clear: inherit; font-size: 12px; text-decoration: none; padding-top: 0px; } .dropline LI A B { padding-bottom: 0px; padding-left: 20px; padding-right: 0px; display: block; float: left; height: 40px; cursor: pointer; padding-top: 0px; } .dropline UL { z-index: 10; border-bottom: #fff 1px solid; position: absolute; padding-bottom: 0px; list-style-type: none; margin: 0px; padding-left: 0px; width: 860px; padding-right: 0px; background: #f8f8f8; height: 25px; border-top: #ff9933 3px solid; top: 40px; list-style-image: none; padding-top: 0px; left: -9999px; } .dropline UL LI { line-height: 25px; height: 25px; } .dropline UL.right LI { float: right; } .dropline UL LI A { padding-bottom: 0px; line-height: 25px; padding-left: 10px; padding-right: 10px; height: 25px; color: #000; font-size: 11px; font-weight: bold; border-right: #e60 1px solid; padding-top: 0px; } .dropline UL LI A:hover { line-height: 25px; background: none transparent scroll repeat 0% 0%; height: 25px; color: #c60; } .dropline UL.right LI A { border-left: #e60 1px solid; border-right: 0px; } .dropline UL LI A.last { border-bottom: 0px; border-left: 0px; border-top: 0px; border-right: 0px; } .dropline :hover UL { left: 0px; } .dropline LI.current UL { z-index: 1; left: 0px; } .dropline LI.current A { line-height: 36px; background: url(../images/menus/tab_a.gif) no-repeat right top; height: 44px; } .dropline LI.current A B { line-height: 36px; background: url(../images/menus/tab_b.gif) no-repeat left top; } .dropline LI.current UL LI A { padding-bottom: 0px; line-height: 25px; padding-left: 10px; padding-right: 10px; background: none transparent scroll repeat 0% 0%; height: 25px; color: #000; padding-top: 0px; } .dropline LI.current UL LI.current_sub A { color: #c60; } .dropline LI.current UL LI A:hover { color: #c60; } <div id="top_nav"> <asp:ContentPlaceHolder ID="phTopNav" runat="server"> <!-- MENU --> <ul id="dropline" class="dropline" runat="server" style="left: -6px; top: -2px; width:1000px;" clientidmode="Static"> <li runat="server" id="Home"> <a runat="server" id="lnkHome" href="../Default.aspx" title="Go to the Home page"><b>Home</b> <!--[if gte IE 7]><!--></a> <!--<![endif]--> <!--[if lte IE 6]> <table> <tr> <td> <![endif]--><!--[if lte IE 6]> </td> </tr> </table> </a><![endif]--> </li> <li runat="server" id="ApplyNow"> <a runat="server" id="lnkEditOrder" href="../OrderChinaVisa.aspx" title="Use our Price Calculator and simultaneously begin the China Visa application process!"><b>Apply Now!</b> <!--[if gte IE 7]><!--></a> <!--<![endif]--> <!--[if lte IE 6]> <table> <tr> <td> <![endif]--><!--[if lte IE 6]> </td> </tr> </table> </a><![endif]--> </li> <li runat="server" id="CheckStatus"> <a id="lnkCheckStatus" runat="server" href="../Check_Status.aspx" title="Check on the status of a placed order"><b>Check Status</b><!--[if gte IE 7]><!--></a><!--<![endif]--> <!--[if lte IE 6]> <table> <tr> <td> <![endif]--><!--[if lte IE 6]> </td> </tr> </table> </a><![endif]--></li> <li runat="server" id="Affiliate"> <a id="lnkAffiliate" runat="server" href="../Secure/VisaActivity.aspx" title=""><b>Affiliate</b><!--[if gte IE 7]><!--></a><!--<![endif]--> <!--[if lte IE 6]> <table> <tr> <td> <![endif]--><!--[if lte IE 6]> </td> </tr> </table> </a><![endif]--></li> </ul> </asp:ContentPlaceHolder> </div>

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  • SQL Server - OPENXML how to get attribute value

    - by DotnetDude
    I have the following XML: <Field FieldRowId="1000"> <Items> <Item Name="CODE"/> <Item Name="DATE"/> </Items> </Field> I need to get the FieldRowId using OPENXML. The SQL i have so far: INSERT INTO @tmpField ([name], [fieldRowId]) SELECT [Name], --Need to get row id of the parent node FROM OPENXML (@idoc, '/Field/Items/Item', 1)

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  • SQL Server Distinct Question

    - by RPS
    I need to be able to select only the first row for each name that has the greatest value. I have a table with the following: id name value 0 JOHN 123 1 STEVE 125 2 JOHN 127 3 JOHN 126 So I am looking to return: id name value 1 STEVE 125 2 JOHN 127 Any idea on the MSSQL Syntax on how to perform this operation?

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  • WPF XAML ComboBox Width

    - by griegs
    I have the following xaml with all the binding removed; <StackPanel Grid.Row="2" Grid.Column="1" Orientation="Horizontal" HorizontalAlignment="Left" Height="20"> <ComboBox x:Name="ddlDay" Width="30"/> If I set the width of the combobox to 200 it works but if I set it to 50 it doesn't size past the default. I'm kinda new to xaml so is this default behavior or what do I do to make the combobox small?

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  • How to animate the drawing of a CGPath?

    - by Jordan Kay
    I am wondering if there is a way to do this using Core Animation. Specifically, I am adding a sub-layer to a layer-backed custom NSView and setting its delegate to another custom NSView. That class's drawInRect method draws a single CGPath: - (void)drawInRect:(CGRect)rect inContext:(CGContextRef)context { CGContextSaveGState(context); CGContextSetLineWidth(context, 12); CGMutablePathRef path = CGPathCreateMutable(); CGPathMoveToPoint(path, NULL, 0, 0); CGPathAddLineToPoint(path, NULL, rect.size.width, rect.size.height); CGContextBeginPath(context); CGContextAddPath(context, path); CGContextStrokePath(context); CGContextRestoreGState(context); } My desired effect would be to animate the drawing of this line. That is, I'd like for the line to actually "stretch" in an animated way. It seems like there would be a simple way to do this using Core Animation, but I haven't been able to come across any. Do you have any suggestions as to how I could accomplish this goal?

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  • Project Euler (P14): recursion problems

    - by sean mcdaid
    Hi I'm doing the Collatz sequence problem in project Euler (problem 14). My code works with numbers below 100000 but with numbers bigger I get stack over-flow error. Is there a way I can re-factor the code to use tail recursion, or prevent the stack overflow. The code is below: import java.util.*; public class v4 { // use a HashMap to store computed number, and chain size static HashMap<Integer, Integer> hm = new HashMap<Integer, Integer>(); public static void main(String[] args) { hm.put(1, 1); final int CEILING_MAX=Integer.parseInt(args[0]); int len=1; int max_count=1; int max_seed=1; for(int i=2; i<CEILING_MAX; i++) { len = seqCount(i); if(len > max_count) { max_count = len; max_seed = i; } } System.out.println(max_seed+"\t"+max_count); } // find the size of the hailstone sequence for N public static int seqCount(int n) { if(hm.get(n) != null) { return hm.get(n); } if(n ==1) { return 1; } else { int length = 1 + seqCount(nextSeq(n)); hm.put(n, length); return length; } } // Find the next element in the sequence public static int nextSeq(int n) { if(n%2 == 0) { return n/2; } else { return n*3+1; } } }

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  • PHP - warning - Undefined property: stdClass - fix?

    - by Phill Pafford
    I get this warning in my error logs and wanted to know how to correct this issues in my code. Warning: PHP Notice: Undefined property: stdClass::$records in script.php on line 440 Some Code: // Parse object to get account id's // The response doesn't have the records attribute sometimes. $role_arr = getRole($response->records); // Line 440 Response if records exists stdClass Object ( [done] => 1 [queryLocator] => [records] => Array ( [0] => stdClass Object ( [type] => User [Id] => [any] => stdClass Object ( [type] => My Role [Id] => [any] => <sf:Name>My Name</sf:Name> ) ) ) [size] => 1 ) Response if records does not exist stdClass Object ( [done] => 1 [queryLocator] => [size] => 0 ) I was thinking something like array_key_exists() functionality but for objects, anything? or am I going about this the wrong way?

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  • java 2D and swing

    - by user384706
    Hi, I have trouble understanding a fundamental concept in Java 2D. To give a specific example: One can customize a swing component via implementing it's own version of the method paintComponent(Graphics g) Graphics is available to the body of the method. Question: What is exactly this Graphics object, I mean how it is related to the object that has the method paintComponent? Ok, I understand that you can do something like: g.setColor(Color.GRAY); g.fillOval(0, 0, getWidth(), getHeight()); To get a gray oval painted. What I can not understand is how is the Graphics object related to the component and the canvas. How is this drawing actually done? Another example: public class MyComponent extends JComponent { protected void paintComponent(Graphics g) { System.out.println("Width:"+getWidth()+", Height:"+getHeight()); } public static void main(String args[]) { JFrame f = new JFrame("Some frame"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setSize(200, 90); MyComponent component = new MyComponent (); f.add(component); f.setVisible(true); } } This prints Width:184, Height:52 What does this size mean? I have not added anything to the frame of size(200,90). Any help on this is highly welcome Thanks

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