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  • Sort by ranking algorithm using will-paginate

    - by bearwithclaws
    I'm creating a digg-like site using Ruby on Rails that ranks the item (based on this algorithm). I'm using the will-paginate gem list the items in pages. The problem is, will-paginate only allows me to insert ':order =' based on the table data. I would like to make will-paginate to sort by a number which is calculated using a function based on different fields on the table (e.g number of votes, age hours). How can I do that?

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  • How to get last full MS SQL Server error message?

    - by JohnM2
    I am aware of: SELECT @@ERROR but it will give me only an ERROR CODE (a number) and I need a full text message like: Cannot insert duplicate key row in object 'dbo.TABLE_NAME' with unique index 'IX_ID_unique'. The statement has been terminated. How can I do that in MS Sql Server 2005 ?

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  • Is there a way to make PHP's SplHeap recalculate? (aka: add up-heap to SplHeap?)

    - by md2k7
    I am using an SplHeap to hold graph nodes of a tree with directed edges that will be traversed from the leaves to the root. For this, I precalculate the "fan-in" of nodes and put them into the heap so that I can always retrieve the node with the smallest fan-in (0) from it. After visiting a node, I reduce the fan-in of its successor by 1. Then obviously, the heap needs to be recalculated because the successor is now in the wrong place there. I have tried recoverFromCorruption(), but it doesn't do anything and keeps the heap in the wrong order (node with larger fanIn stays in front of smaller fanIn). As a workaround, I'm now creating a new heap after each visit, amounting to a full O(N*log(N)) sort each time. It should be possible, however, to make up-heap operations on the changed heap entry until it's in the right position in O(log(N)). The API for SplHeap doesn't mention an up-heap (or deletion of an arbitrary element - it could then be re-added). Can I somehow derive a class from SplHeap to do this or do I have to create a pure PHP heap from scratch? EDIT: Code example: class VoteGraph { private $nodes = array(); private function calculateFanIn() { /* ... */ } // ... private function calculateWeights() { $this->calculateFanIn(); $fnodes = new GraphNodeHeap(); // heap by fan-in ascending (leaves are first) foreach($this->nodes as $n) { // omitted: filter loops $fnodes->insert($n); } // traversal from leaves to root while($fnodes->valid()) { $node = $fnodes->extract(); // fetch a leaf from the heap $successor = $this->nodes[$node->successor]; // omitted: actual job of traversal $successor->fanIn--; // will need to fix heap (sift up successor) because of this //$fnodes->recoverFromCorruption(); // doesn't work for what I want // workaround: rebuild $fnodes from scratch $fixedHeap = new GraphNodeHeap(); foreach($fnodes as $e) $fixedHeap->insert($e); $fnodes = $fixedHeap; } } } class GraphNodeHeap extends SplHeap { public function compare($a, $b) { if($a->fanIn === $b->fanIn) return 0; else return $a->fanIn < $b->fanIn ? 1 : -1; } }

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  • Ignore collection properties in PropertyInfo

    - by LukePet
    I have a function with this code: foreach (PropertyInfo propertyInfo in typeof(T).GetProperties()){ //SOME CODE if (propertyInfo.CanWrite) propertyInfo.SetValue(myCopy, propertyInfo.GetValue(obj, null), null); } I would avoid to check "collection" properties; to do this now I have insert this control: if (propertyInfo.PropertyType.Name.Contains("List") || propertyInfo.PropertyType.Name.Contains("Enumerable") || propertyInfo.PropertyType.Name.Contains("Collection")) continue; but, It don't like me! Which is a better way to do it?

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  • How to add separator between items in a Spark List control

    - by simms2k
    I have a s:List where I've defined my own itemRenderer, and would like to insert a horizontal line separating items, similar to the way the mx:LinkBar works. I don't want to have a line at the top or bottom of the list, so I can't just include an upper or lower border in the itemRenderer. I was hoping the itemRenderer could be made aware of its index in the list, but I don't see how. Is there a way to do this?

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  • Tree-like queues

    - by Rehno Lindeque
    I'm implementing a interpreter-like project for which I need a strange little scheduling queue. Since I'd like to try and avoid wheel-reinvention I was hoping someone could give me references to a similar structure or existing work. I know I can simply instantiate multiple queues as I go along, I'm just looking for some perspective by other people who might have better ideas than me ;) I envision that it might work something like this: The structure is a tree with a single root. You get a kind of "insert_iterator" to the root and then push elements onto it (e.g. a and b in the example below). However, at any point you can also split the iterator into multiple iterators, effectively creating branches. The branches cannot merge into a single queue again, but you can start popping elements from the front of the queue (again, using a kind of "visitor_iterator") until empty branches can be discarded (at your discretion). x -> y -> z a -> b -> { g -> h -> i -> j } f -> b Any ideas? Seems like a relatively simple structure to implement myself using a pool of circular buffers but I'm following the "think first, code later" strategy :) Thanks

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  • Setting 0/1-to-1 relationship in SQLAlchemy?

    - by Timmy
    is there a proper way of setting up a 0/1-to-1 relationship? i want to be able to check if the related item exists without creating it: if item.relationship is None: item.relationship = item2() but it creates the insert statements on the if statement

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  • cakephp hasMany through and multiselect form

    - by Zoran Kalinic
    I'm using cakephp 2.2.2 and I have a problem with the editing view Models and relationships are: Person hasMany OrganizationPerson Organization hasMany OrganizationPerson OrganizationPerson belongs to Person,Organization A basic hasMany through relationship as found within cake documentation. Tables are: people (id,...) organizations (id,...) organization_people (id, person_id,organization_id,...) In the person add and edit forms there is a select box allowing a user to select multiple organization. The problem I have is, when a user edits an existing person, the associated organizations aren't pre-selected. Here is the code in the PeopleController: $organizations = $this->Person->OrganizationPerson->Organization->find('list'); $this->set(compact('organizations')); Related part of the code in the People/edit code looks like: $this->Form->input('OrganizationPerson.organization_id', array('multiple' => true, 'empty' => false)); This will populate the select field, but it does not pre-select it with the Person's associated organizations. Format and content of the $this-data: Array ( [Person] => Array ( [id] => 1 ... ) [OrganizationPerson] => Array ( [0] => Array ( [id] => 1 [person_id] => 1 [organization_id] => 1 ... ) [1] => Array ( [id] => 2 [person_id] => 1 [organization_id] => 2 ... ) ) ) What I have to add/change in the code to get pre-selected organizations? Thanks in advance!

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  • Serialization Error:Unable to generate a temporary class (result=1).\r\nerror CS0030:- c#

    - by ltech
    Running XSD.exe on my xml to generate C# class. All works well except on this property public DocumentATTRIBUTES[][] Document { get { return this.documentField; } set { this.documentField = value; } } I want to try and use CollectionBase, and this was my attempt public DocumentATTRIBUTESCollection Document { get { return this.documentField; } set { this.documentField = value; } } /// <remarks/> [System.SerializableAttribute()] [System.Diagnostics.DebuggerStepThroughAttribute()] [System.ComponentModel.DesignerCategoryAttribute("code")] [System.Xml.Serialization.XmlTypeAttribute(AnonymousType = true)] public partial class DocumentATTRIBUTES { private string _author; private string _maxVersions; private string _summary; /// <remarks/> [System.Xml.Serialization.XmlElementAttribute(Form = System.Xml.Schema.XmlSchemaForm.Unqualified)] public string author { get { return _author; } set { _author = value; } } /// <remarks/> [System.Xml.Serialization.XmlElementAttribute(Form = System.Xml.Schema.XmlSchemaForm.Unqualified)] public string max_versions { get { return _maxVersions; } set { _maxVersions = value; } } /// <remarks/> [System.Xml.Serialization.XmlElementAttribute(Form = System.Xml.Schema.XmlSchemaForm.Unqualified)] public string summary { get { return _summary; } set { _summary = value; } } } public class DocumentAttributeCollection : System.Collections.CollectionBase { public DocumentAttributeCollection() : base() { } public DocumentATTRIBUTES this[int index] { get { return (DocumentATTRIBUTES)this.InnerList[index]; } } public void Insert(int index, DocumentATTRIBUTES value) { this.InnerList.Insert(index, value); } public int Add(DocumentATTRIBUTES value) { return (this.InnerList.Add(value)); } } However when I try to serialize my object using XmlSerializer serializer = new XmlSerializer(typeof(DocumentMetaData)); I get the error: {"Unable to generate a temporary class (result=1).\r\nerror CS0030: Cannot convert type 'DocumentATTRIBUTES' to 'DocumentAttributeCollection'\r\nerror CS1502: The best overloaded method match for 'DocumentAttributeCollection.Add(DocumentATTRIBUTES)' has some invalid arguments\r\nerror CS1503: Argument '1': cannot convert from 'DocumentAttributeCollection' to 'DocumentATTRIBUTES'\r\n"} the XSD pertaining to this property is <xs:complexType> <xs:sequence> <xs:element name="ATTRIBUTES" minOccurs="0" maxOccurs="unbounded"> <xs:complexType> <xs:sequence> <xs:element name="author" type="xs:string" minOccurs="0" /> <xs:element name="max_versions" type="xs:string" minOccurs="0" /> <xs:element name="summary" type="xs:string" minOccurs="0" /> </xs:sequence> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element>

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  • Restrict update Column

    - by Kushan Hasithe Fernando
    Is it possible to restrict updating a column in SQL without using a trigger ? If so how ? (need the query) PS: I mean, I have a table CREATE TABLE MYBUDGET.tbl_Income ( [IncomeID] INT NOT NULL IDENTITY(1,1), [IncomeCatID] INT NOT NULL, [IncomeAmnt] MONEY NOT NULL, [IncomeCurrencyID] INT NOT NULL, [ExchangeRateID] INT NOT NULL, [IncomeAmnt_LKR] MONEY NOT NULL, [AddedOn] DATETIME NOT NULL, [Remark] VARCHAR(250), ) I need to allow users to update only [ExchangeRateID] and [IncomeAmnt_LKR] fields. All other fields can not be updated. only insert.

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  • Create attribute in existing XML

    - by user560411
    Hello. I have the following php code that inserts data into XML and works correctly. However, I want to add an ID number like below <CD id="xxxx"> My question is how can i add an ID into CD for this to work ? I use form to parse the id. ** the main code ** <?php $CD = array( 'TITLE' => $_POST['title'], 'BAND' => $_POST['band'], 'YEAR' => $_POST['year'], ); $doc = new DOMDocument(); $doc->load( 'insert.xml' ); $doc->formatOutput = true; $r = $doc->getElementsByTagName("CATEGORIES")->item(0); $b = $doc->createElement("CD"); $TITLE = $doc->createElement("TITLE"); $TITLE->appendChild( $doc->createTextNode( $CD["TITLE"] ) ); $b->appendChild( $TITLE ); $BAND = $doc->createElement("BAND"); $BAND->appendChild( $doc->createTextNode( $CD["BAND"] ) ); $b->appendChild( $BAND ); $YEAR = $doc->createElement("YEAR"); $YEAR->appendChild( $doc->createTextNode( $CD["YEAR"] ) ); $b->appendChild( $YEAR ); $r->appendChild( $b ); $doc->save("insert.xml"); ?> the XML file <?xml version="1.0" encoding="utf-8"?> <MY_CD> <CATEGORIES> <CD> <TITLE>NEVER MIND THE BOLLOCKS</TITLE> <BAND>SEX PISTOLS</BAND> <YEAR>1977</YEAR> </CD> <CD> <TITLE>NEVERMIND</TITLE> <BAND>NIRVANA</BAND> <YEAR>1991</YEAR> </CD> </CATEGORIES> </MY_CD>

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  • MEF instance management

    - by Lawrence A. Contreras
    I am working on application that has multiple modules and sub modules. Here's what I need to do: ModuleA has a sub module SubModuleA, SubModuleB, SubModuleC. I want to export ModuleA, SubModuleA, SubModuleB, SubModuleC. ModuleA can have multiple instances. Whenever I import ModuleA inside the sub modules, I want to get the correct instance and also when I import SubModuleA,SubModuleB and SubModuleC inside other classes. How can I manage that scenario using MEF? Do I really need to use MEF. Updated: Here's a quick example: public class School { List<Classroom> classRooms { get; set; } } [Export] public class Classroom { List<Teacher> teachers { get; set; } } public class Teacher { List<Student> students { get; set; } } public class Student { [Import] Classroom classroom { get; set; } } As you can see, I want to export the classroom class because I need to import it in the Student class, let's just say that I really need the classroom class inside the student class. I want to skip the part where we pass the classroom to the teacher and from the teacher we'll pass it to the student. But when I import classroom, I want to have the correct instance where that class room contains the teacher of the student.

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  • The Best Way to shred XML data into SQL Server database columns

    - by eddiegroves
    What is the best way to shred XML data into various database columns? So far I have mainly been using the nodes and value functions like so: INSERT INTO some_table (column1, column2, column3) SELECT Rows.n.value('(@column1)[1]', 'varchar(20)'), Rows.n.value('(@column2)[1]', 'nvarchar(100)'), Rows.n.value('(@column3)[1]', 'int'), FROM @xml.nodes('//Rows') Rows(n) However I find that this is getting very slow for even moderate size xml data.

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  • How to fill a two Dimensional ArrayList in java with Integers?

    - by eNetik
    I have to create a 2d array with unknown size. So I have decided to go with a 2d ArrayList the problem is I'm not sure how to initialize such an array or store information. Say I have the following data 0 connects 1 2 connects 3 4 connects 5 ....etc up to a vast amount of random connections and I want to insert true(1) into [0][1], true(1) into [2][3], true(1) into [4][5]. Can the array automatically update the column/rows for me Any help is appreciated thanks

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  • "Too many indexes on table" error when creating relationships in Microsoft Access 2010.

    - by avianattackarmada
    I have tblUsers which has a primary key of UserID. UserID is used as a foreign key in many tables. Within a table, it is used as a foreign key for multiple fields (e.g. ObserverID, RecorderID, CheckerID). I have successfully added relationships (with in the the MS Access 'Relationship' view), where I have table aliases to do the multiple relationships per table: *tblUser.UserID - 1 to many - tblResight.ObserverID *tblUser_1.UserID - 1 to many - tblResight.CheckerID After creating about 25 relationships with enforcement of referential integrity, when I try to add an additional one, I get the following error: "The operation failed. There are too many indexes on table 'tblUsers.' Delete some of the indexes on the table and try the operation again." I ran the code I found here and it returned that I have 6 indexes on tblUsers. I know there is a limit of 32 indexes per table. Am I using the relationship GUI wrong? Does access create an index for the enforcement of referential integrity any time I create a relationship (especially indexes that wouldn't turn up when I ran the script)? I'm kind of baffled, any help would be appreciated.

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  • Partitioning a table in mysql after creation

    - by erik
    I have a table with a bunch of data already in it. I know how to create a partitioned table or alter an already existing partitioned table, but can I add partitions to a table after it has been created, has data in it, without losing the data? The other option is to dump all the data, recreate the table with the partitions and then insert it all back it. Is that the only way? Thanks.

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  • get data from a querystring

    - by regwe
    i have this querystring that shall open up my page. http://www.a1-one.com/[email protected]&stuid=123456 Now when this page loads, on page_load, I want to pick up email and stuid in two different variables. So I can use them to insert into my database (sql server) how can this be done in vb.net

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  • Href link with php value

    - by Aruna
    hi i am having a link like below <a href="#" onclick="window.open('http://www.twitter.com/home?status=Reading+Facebook share, Yahoo Buzz and Tweet this buttons for Blogger blogs+http://www.didiknow.com');">Tweet this</a> i want to insert a php variable value inside for the status thing like <a href="#" onclick="window.open('http://www.twitter.com/home?status=$markme_ddesc">Tweet this</a> how to do so?? please help me..

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  • How do I encode Unicode strings using pyodbc to save to a SAS dataset?

    - by Chris B.
    I'm using Python to read and write SAS datasets, using pyodbc and the SAS ODBC drivers. I can load the data perfectly well, but when I save the data, using something like: cursor.execute('insert into dataset.test VALUES (?)', u'testing') ... I get a pyodbc.Error: ('HY004', '[HY004] [Microsoft][ODBC Driver Manager] SQL data type out of range (0) (SQLBindParameter)') error. The problem seems to be the fact I'm passing a unicode string; what do I need to do to handle this?

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  • TinyMCE Custom Tags Rendering

    - by Cullen2010
    I have add a custom plugin that insert custom tags into my tinyMCE editor of the format: title I want the custom tags to be rendered with some styles when viewed in the WYSIWYG view. I have seen one response to a similar question : http://topsecretproject.finitestatemachine.com/2010/02/how-to-custom-tags-with-tinymce/ but this doesn't work - they tags are not stripped out but they are not styled either??

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  • sql data source

    - by George
    I have a table (EmployeeID,EmployeeName,ManagerID) How can I create a sqldatasource to include the ManagerName from the EmployeeName given EmployeeID = ManagerID? In my gridview after dragging a dropdownlist what bindings should I do to display the managerName? Is it possible to use it without writing custom select,insert,delete,update? If not what are the steps I need to do to write the whole thing i.e. custom grid and source? Thank you very much

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