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• iOS Development: Can I store an array of integers in a Core Data object without creating a new table to represent the array?

  - by BeachRunnerJoe

  Hello. I'm using Core Data and I'm trying to figure out the simplest way to store an array of integers in one of my Core Data entities. Currently, my entities contain various arrays of objects that are more complex than a single number, so it makes sense to represent those arrays as tables in my DB and attach them using relationships. If I want to store a simple array of integers, do I need to create a new table with a single column and attach it using a one-to-many relationship? Or is there a more simple way? Thanks in advance for your wisdom!

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• [sqlalchemy] subquery in select statement

  - by webjunkie

  Hi guys, I have two tables (albums,pictures) in a one to many relationship and I want to display each albums details with one picture so I have the following query select albums.name,(select pictures.path from pictures where pictures.albumid=albums.id limit 1) as picture from albums where ... Now I'm struggling creating this on Pylons with sqlalchemy I tried to do the following picture = Session.query(model.Picture) sub_q = picture.filter_by(albumid = model.Album.id).limit(1).subquery() album_q = Session.query(model.Album, sub_q) result = album_q.all() but it creates the following statement displaying the incorrect picture beacuse the table albums is included in the subquery select albums.name,(select pictures.path from pictures,albums where pictures.albumid=albums.id) from albums where ... Am I doing it wrong?, is this even possible in sqlalchemy?.

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• How do I customize the format of git rebase --interactive commit messages?

  - by adamjford

  Hi everyone, I use git for my local work (and love it ever so much), and I follow a workflow similar to the one described in this article. So basically, when starting on a new feature, I create a branch for it, go through the usual hack then commit cycle, and when I think I'm done with it, I squash it into a single commit using git rebase --interactive master, and these squashed commit messages always end up looking like the example in the article, reproduced here: [#3275] User Can Add A Comment To a Post * Adding Comment model, migrations, spec * Adding Comment controller, helper, spec * Adding Comment relationship with Post * Comment belongs to a User * Comment form on Post show page Of course, that's after a bunch of removing # This is the xth commit message lines and copy/pasting * in front of each commit message. Now, what I was wondering, is there any way to customize how git rebase -i outputs the merged commit messages so I don't have to do all that hacking? (I use msysgit, if that matters.) Thanks!

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• How to set up two models having a has_many association with each other

  - by daz13

  I'm looking for a suggestion on how to set up two models, Teacher and Subject. A Teacher can have many Subjects, and a Subject can have many Teachers. Another thing to consider in the relationship between the two models is that a Teacher can create a Subject and add other Teachers to the Subject. I think I'm solid on the basics of the set up for each model: for teacher.rb: has_many :subjects for subject.rb: has_many :teachers and the teachers table should have a subject_id column and the subject table should have a teacher_id column. What I'm not sure about is how to set up the views (and corresponding controller methods) to allow the addition of a Teacher to a Subject. Any suggestions (or links to examples) are greatly appreciated. I haven't been able to find anything on this exact case.

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• How is a constructor executed?

  - by simion

  I am doing some reviison from the lecture slides and it says a constructor is executed in the following way; If the constructor starts with this, recursively execute the indicated constructor, then go to step 4. Invoke the explicitly or implicitly indicated superclass constructor (unless this class is java.lang.Object) Initialise the fields of the object in the order in which they were declared in this class Execute the rest of the body of this constructor. What i dont undertsand is that, a constructor can never "start" with this, because even if it forms no class heirarchy/relationship then super() is inserted by default. How would this fit in with the description above? Thanks

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• Core Data: Detecting the type and casting it

  - by Tim Sullivan

  I have set up a Core Data model that includes an entity, Item with a 1-M relationship with the abstract entity Place, so that an item has many places. There are several entities with the parent set to Place. I want to set up several UI elements depending on the descendent place types. I have a loop that looks something like this: for (Place *place in item.places) { } ... but I'm not sure how to detect what type the place is, and how to cast it to the proper type so that I can access its properties. Thanks for any help!

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• How should I store this information?

  - by 5YrsLaterDBA

  I have a PrivilegeGroup table, a Privileges table and a link table because the PrivilegeGroup table and the Privileges table is a many to many relationship. I am thinking about load all contents of PrivilegeGroup table and Privilege table into memory from database at beginning when application started. I want to save them in a form easily to look up. Usually we will look up the PrivilegeCode via GroupId. Which structure is good for this purpose? array of list? dictionary?

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• Duplicate records

  - by czuroski

  Hello, I am using nHibernate for db persistence. I have a one-to-many relationship defined between 2 tables. When I query and try to get data, I am getting the correct number of rows from the "many" table, but the rows are duplicates of the first row returned. table1 (one), table2 (many). I create a criteria query to get a certain record from table1. I then expect to get all associated records from table2. ie, table1 holds orders, table2 holds items. I query table1 to get an order which has 4 items. I expect to see each of those 4 items from table2, but all I am seeing is the 1st item repeated 4 times. Does anyone have any idea what might be happening?

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• Ubuntu server header timeout

  - by Tabatha M

  I'm running Ubuntu Linux 12.04.1 Kernel and CPU Linux 3.2.0-30-generic on x86_64. Intel(R) Xeon(R) CPU E31230 @ 3.20GHz, 8 cores I recently came across this problem. I'm using apache2/php latest and when I run $url_headers = @get_headers($url); Inside PHP it would normally take milliseconds to within a second to get the headers. Now recently it can take up to 15 seconds or even timeout. It has worked great for over a year and recently started doing this. I'm not sure how to go about fixing it, any help would be greatly appreciated. Thank you

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• Symfony use NativeSQL to JOIN unrelated tables

  - by keybored

  I'd like to run a query like this: $rsm = new ResultSetMappingBuilder($this->em); $rsm->addRootEntityFromClassMetadata('myBundle:Foo', 'f'); $rsm->addRootEntityFromClassMetadata('myBundle:Bar', 'b'); $sql = 'SELECT l.*, b.* FROM foos f INNER JOIN FROM bars b ON b.baz_id = f.baz_id WHERE l.bam = 1'; $query = $this->em->createNativeQuery($sql, $rsm); $fooBarQuery= $query->getResult(); Unfortunately this is not a situation where I can set up a proper relationship in the entity. Is not going to be possible for me to do this? Thanks.

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• Is there good FAT driver for FUSE? (Lightweight, not mountlo)

  - by Vi.

  FUSE filesystem list show some FuseFat and FatFuse. Both are old, FatFuse is read-only , FuseFat is non-buildable and probably depends on glib. Now I'm using mountlo for the task (mounting USB drives in generic way without root access or suid things (except of fusermount itself)), but it looks too big for such task. Using FUSE to mount external storage devices is good both for security and for flexibility reason: the kernel sees only block reads and writes while actual code that deals with filesystem details runs with user privileges, allowing user to use custom filesystems and preventing from kernel filesystem exploits. Is there good vfat FUSE driver?

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• Can I use applescript to click buttons in background?

  - by Giorgio

  Sorry for this generic and probably bad-written question. I've never programmed in applescript, but I'm quite familiar with other coding language. I'm in the need of clicking on 2 sequential button inside the lobby of a software (when you click the first a popup appears and we should click 'ok'). However things are a little bit more complicated then this because: 1) the lobby of this program isn't in foreground: it's covered by other windows opened. (I don't have experience so I don't know if this represent a problem). 2) there should be a timer and the program should click this button at regular intervals. Is this feasible with applescript?

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• Rails - How to secure foreign keys and still allow association selection

  - by Bryce

  For simplicity, assume that I have a simple has-many-through relationship class User < ActiveRecord::Base has_many :courses, :through => :registrations end class Registration < ActiveRecord::Base belongs_to :user belongs_to :course end class Course < ActiveRecord::Base has_many :users, :through => :registrations end I want to keep my app secure, so I use attr_accessible to whitelist my attributes. My question is twofold: How would I set up my whitelist attributes such that I could create a new Registration object through a form (passing in :user and :course, but not risk allowing those foreign keys to be maliciously updated later? How would I set up my validations such that both belongs_to associations are required BUT also allow for Registration objects to be created in nested forms?

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• Need help sending mass emails [closed]

  - by Jose

  Possible Duplicate: Prevent mail being marked as spam I have an Ubuntu server that I want to be able to send out several thousand emails each containing a generic header and an unique pdf attachment containing an invoice. What I want to know is what would be the best way to accomplish this? Also, are there any other programs I need to install such as anti-virus / verification tools? I would like to be able to know what the procedures for this normally are as I would prefer that the emails are not send to the junk folder of the clients receiving the emails. Any tips would be appreciated. Thanks

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• AS or not to AS, queries

  - by zeMinimalist

  I'm fairly new to PHP/MySql and using queries in general. I was just wondering if there's any benefit to using "AS" in a query other than trying to make it look cleaner? Does it speed up the query at all? I probably could have figured this out by a google search but I wanted to ask my first question and see how this works. I WILL select an answer (unlike some people...) with: SELECT news.id as id news.name as name FROM news without: SELECT news.id news.name FROM news A more complex example from a many-to-many relationship tutorial I found: SELECT c.name, cf.title FROM celebrities AS c JOIN ( SELECT icf.c_id, icf.f_id, f.title FROM int_cf AS icf JOIN films AS f ON icf.f_id = f.f_id ) AS cf ON c.c_id = cf.c_id ORDER BY c.c_id ASC

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• Find original owning process of a Linux socket

  - by Rob H

  In Linux and other UNIX-like operating systems, it is possible for two (or more) processes to share an Internet socket. Assuming there is no parent-child relationship between the processes, is there any way to tell what process originally created a socket? Clarification: I need to determine this from "outside" the processes using the /proc filesystem or similar. I can't modify the code of the processes. I can already tell what processes are sharing sockets by reading /proc/<pid>/fd, but that doesn't tell me what process originally created them.

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• AppDelegate, RootViewController, and UIApplication

  - by guy8214

  Hi Guys I am trying to figure out the relationship between the appdelegate, RootViewControoler, and UIApplication. Here is what I kinda have figured out so far: When starting your application up, main.m gets loaded. From here, your MainWindow.xib gets loaded. In your MainWindow.xib, your File's Owner is of type UIApplication. You set your UIApplication's delegate to your AppDelegate. In your AppDelegate's source code, you can set your RootViewController to be the first view shown. Is this right? What prompts AppDelegate to initially run it's - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { } method?

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• login with users, groups and permissions

  - by Dan Bemowski

  OK, I have a set of tables that I want to use for my user logins. I am guessing that I need a separate model for each table in the database. My tables are as follows: Users - user information such as first and last name, groups_id, status, etc... groups - defines the user groups with id, name, description permissions - defines a list of permissions that a group can have permission_assignments - groups_id and permissions_id. many to many relationship table I am not sure how to go about populating an array that would contain the list of permissions that a user would have based on the group they are in after a successful login. Basically, a user belongs to a group, and the group gets assigned permissions. I want to then be able to validate functions/methods based on weather the logged in user has certain permissions. Any help is appreciated

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• Should I pointer-cast from a private derived class to its base class?

  - by skydoor

  I found this from C++FAQ Generally, No. From a member function or friend of a privately derived class, the relationship to the base class is known, and the upward conversion from PrivatelyDer* to Base* (or PrivatelyDer& to Base&) is safe; no cast is needed or recommended. However users of PrivatelyDer should avoid this unsafe conversion, since it is based on a private decision of PrivatelyDer, and is subject to change without notice. How to understand the above words? I don't think the explanation is correct or accurate. I have a code like this class A{ }; class B: private A{ }; int main(){ B *b = new B(); A *a = new A(); a = b; //wrong a = (A*)b; //right }

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• how to integrate my users database table with the aspnet_users table that comes with asp.net members

  - by ooo

  i have a database that already has a users table COLUMNS: userID - int loginName - string First - string Last - string i just installed the asp.net membership table. Right now all of my tables are joined into my users table foreign keyed into the "userId" field How do i integrate asp.net_users table into my schema? here are the ideas i thought of: Add a membership_id field to my users table and on new inserts, include that new field in my users table. This seems like the cleanest way as i dont need to break any existing relationships. break all existing relationship and move all of the fields in my user table into the asp.net_users table. This seems like a pain but ultimately will lead to the most simple, normalized solution any thoughts?

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• How do I filter values in a Django form using ModelForm?

  - by malandro95

  I am trying to use the ModelForm to add my data. It is working well, except that the ForeignKey dropdown list is showing all values and I only want it to display the values that a pertinent for the logged in user. Here is my model for ExcludedDate, the record I want to add: class ExcludedDate(models.Model): date = models.DateTimeField() reason = models.CharField(max_length=50) user = models.ForeignKey(User) category = models.ForeignKey(Category) recurring = models.ForeignKey(RecurringExclusion) def __unicode__(self): return self.reason Here is the model for the category, which is the table containing the relationship that I'd like to limit by user: class Category(models.Model): name = models.CharField(max_length=50) user = models.ForeignKey(User, unique=False) def __unicode__(self): return self.name And finally, the form code: class ExcludedDateForm(ModelForm): class Meta: model = models.ExcludedDate exclude = ('user', 'recurring',) How do I get the form to display only the subset of categories where category.user equals the logged in user?

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• Very basic database theory.

  - by John R

  I have a set of tables to show the relationship between organziations and supporters below. Although I have done some basic mySQL querries, I know very little about database 'design'. I plan to querry the database for: -a list of contributors to a specific organization... or, -a list of organizations that a specific suporter supports. The database tables for organiations and contributors may have other columns in the future and recieve a lesser amount of querries based on that information. A | X A | Y A | Z B | X B | Y C | X C | Z How should the tables be set up? I assume that there should be a third table, but there is still redundent information in the third table. Is there a better way of setting up the tables? +----+-------+ +-------------+----------+ +----+-------+ | id | org | | org | contr | | id | contr.| +----+-------+ +-------------+----------+ +----+-------+ | 1 | A | | 1 | 1 | | 1 | X | | 2 | B | | 1 | 2 | | 2 | Y | | 3 | C | | 1 | 3 | | 3 | Z | +----+-------+ | 2 | 1 | +----+-------+ | 2 | 2 | | 3 | 1 | | 3 | 3 | +-------------+----------+

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• Timezone settings in MySQL - Using NOW()?

  - by matt74tm

  SOmewhat related to Doing calculations in MySQL vs PHP Right now, our database assumes that the system time is in UTC and uses that to calculate NOW(). PHP explicitly sets the timezone as UTC (so its impervious to server time zone shifts). An accidental shift of timezones on the server messed this relationship up at the database level and i'm now trying to figure out the ideal congiguration: configure Mysql to be in UTC, but also from the perspective that: our application may be on someone else's server where they might have a different TZ (so i cant set the timezone at the mysql/server level). How do i configure it at the specific database level?

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• 1TB HDD making strange noise (not a common one)

  - by Darkkurama

  I built a new PC some days ago, and everything seems perfect, except that the 1 TB HDD I cloned from my old 500 GB HDD is making a deep weird sound. First of all, every time I access the disk, I hear a deep sound, and when the PC is turning on, I hear some clicking (the rapid clicking is my mouse, I'm opening and closing folders to trigger the vibrating deep weird sound I'm describing). I'm using this 1TB disk for data mainly (I use a SSD as the OS). As background information, the disk is a seagate barracuda 7200 rpm which was RMAd and replaced with a refurbished one. Maybe the refurbished disks make these noises? should I worry about my data? (although the disk is working normal and passed a seagatetools short generic test? Thanks! PS: I recorded the sounds, just click on the links. Thanks

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• rails - REST or create another method

  - by user1304740

  Let's assume we have two models linked with a 1-to-many relationship (like clients and invoices - a client can have many invoices). In a view of a 'client' (let's say the 'show' view), there is a form to capture an 'invoice'. I found 2 approaches: This form should be handled by the 'invoice' controller (method create), having client_id passed as a parameter This form should be handled by a new method in 'client' controller, probably a PUT method defined in routes.rb. Is there a 'Rails way', or both of them are good? Is there a preffered way? Thanks!

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