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• mysql circular dependency in foreign key constraints

  - by Flavius

  Given the schema: What I need is having every user_identities.belongs_to reference an users.id. At the same time, every users has a primary_identity as shown in the picture. However when I try to add this reference with ON DELETE NO ACTION ON UPDATE NO ACTION, MySQL says #1452 - Cannot add or update a child row: a foreign key constraint fails (yap.#sql-a3b_1bf, CONSTRAINT #sql-a3b_1bf_ibfk_1 FOREIGN KEY (belongs_to) REFERENCES users (id) ON DELETE NO ACTION ON UPDATE NO ACTION) I suspect this is due to the circular dependency, but how could I solve it (and maintain referential integrity)?

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• Passing arguments to scope_procedure in searchlogic

  - by Greg

  I'd like to use searchlogic's scope_procedure feature like so class MyModelObject < ActiveRecord::Base scope_procedure :my_scope_proc, lambda { |p1, p2| { :conditions => "p1 >= #{p1} AND p2 < #{p2}" }} end Then, I am doing the search: scope = MyModelObject.search(:my_scope_proc => true) scope.all The above code obviously doesn't work because I didn't pass p1 and p2 parameters to my named scope. I can't figure out how to pass parameters to the named scope.

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• C# rendering graph

  - by subodh

  i have to render a graph in my web page.i have desigened a class( in C#) file which contain a event for rendering a graph(pie chart).In that event i pass some value i.e legends which is a string[] and value which is double[] to draw the graph. But i want that instead of inserting the value directly into the event, pass that value with some function like public void insertvalue(string[] legends,double[] values) { } how could i do that plese help me???????? And i am using Zedgraphweb control to render the graph.

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• Problem migrating membershipProvider functionality from mvc1 to mvc2

  - by Jericho

  I am migrating a web app in mvc1 to mvc2. When it came down to migrating my MembershipProvider authentication I keep getting errors that MembershipProvider and MembershipCreateStatus type cannot be found. I do have the reference to System.Web which to my understanding includes the Security reference, but when I examine the the object, those types do not appear. I am just getting familiar with mvc2, if anyone has any input on this it would be extremely appreciated.

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• Javascript (JSON) Objects: Get Parent

  - by Dänu

  Hey Guys I got some question about nested javascript objects (is it me, google or is javascript quite poorly documented?). Now, I got the following (nested) object: obj: { subObj: { 'hello world' } }; next thing I do is to reference the subobject like this: var s = obj.subObj; now what I would like to do, is to get a reference to the object obj out of the variable s. Something like: var o = s.parent; Is this somehow possible?

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• is it possible to load a shared library on a shared memory?

  - by quimm2003

  I have a server and a client written in C. I try to load a shared library in the server and then pass library function pointers to the client. This way I can change the library without have to compile the client. Because of every process has its own separate memory space, I wonder if it is possible to load a shared library on a shared memory, pass the function pointers and map the shared memory on the client and then make the client execute the code of the library loaded by the server.

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• Isn't objective-c function parameter syntax weird? [closed]

  - by Haoest

  Consider the following method: +(void) myMethod:(int)arg1 **argument2**(int)arg2 **argument3**(int) arg3; See how the first argument, unlike the 2nd and 3rd, doesn't have a description, giving it an impression of bad symmetry. Also you would expect the extra typing will provide named argument as you pass it in, but you still have to pass them in the correct order. Can anyone help me make sense of this?

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• In django 1.1, how do I find a form field's max_length attribute

  - by AlexH

  I have a form that looks like this: class SampleForm(forms.Form): text = forms.CharField(max_length=100) In my django template, I want to reference the fact that the length is 100. I tried {{ form.text.max_length }} to no avail. On a related note, how do I reference this value in python?

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• Facebook API, export group wall entries

  - by Guy David

  After trying to find a reference to an API/tutorial to such thing, I have come here. I would like to scan a specific group wall, pulling all posts from it, with PHP or C#. In the end, I would like to have a nested-array containing each posts, with the next details: An array of the related comments Likes Views Obviously, I don't ask for any code, only a reference to the related API I will need to use. EDIT: If this is not possible, should I consider cURL as an option?

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• Converting a pointer C# type to F#??

  - by Brendon

  Hello all I am just a beginner in programing i wish covert some code from C# to F#, I have encotered this code: "float[] v1=new float[10]" I need to use this pointer to pass to the function: "ComputeBuffer bufV1 = new ComputeBuffer(Context, ComputeMemoryFlags.ReadWrite | ComputeMemoryFlags.UseHostPointer, v1);" If i creat an array in F# like this: "let v1 = [| 1.0..10.0 |]" and call now the funaction like this: "let bufV1 = new ComputeBuffer(Context, ComputeMemoryFlags.ReadWrite ||| ComputeMemoryFlags.UseHostPointer, v1)" Is it an error?? How do i pass a pointer??

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• How can I implement a dispatch table using Perl objects?

  - by bitbucket

  What is the syntax for the hash value for a Perl object member subroutine reference in a dispatch table? use lib Alpha; my $foo = new Alpha::Foo; $foo->bar(); my %disp_table = ( bar => ??? ); I want ??? to be the code reference for $foo->bar().

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• referencing (this) in a function

  - by Sara Chipps

  I have elements being generated by dynamic html, I would like to reference the particular href that is calling the function when one of many may be calling it. <a href="javascript:Foo(this)">Link</a> Does not work when I try to reference $(this). Is there another way to do this or do I have to make dynamic ids?

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• passing data to and from server using xml

  - by sapna

  i need to design a web site in which data is passed to and from the server using xml.i got it how to transform data from database to xml and then to html.but i am not able to find how to pass data from client to server using xml.webpages are designed using asp.is it possible to do pass data from client to server using xml.what are the things that are to be studied.help needed immediately.

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• Is there a better way to format this Python/Django code as valid PEP8?

  - by Ryan Detzel

  I have code written both ways and I see flaws in both of them. Is there another way to write this or is one approach more "correct" than the other? def functionOne(subscriber): try: results = MyModelObject.objects.filter( project__id=1, status=MyModelObject.STATUS.accepted, subscriber=subscriber).values_list( 'project_id', flat=True).order_by('-created_on') except: pass def functionOne(subscriber): try: results = MyModelObject.objects.filter( project__id=1, status=MyModelObject.STATUS.accepted, subscriber=subscriber) results = results.values_list('project_id', flat=True) results = results.order_by('-created_on') except: pass

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• extract transform load

  - by mitch

  Wikipedia defines a 'typical' ETL cycle as : Cycle initiation Build reference data Extract (from sources) Validate Transform (clean, apply business rules, check for data integrity, create aggregates or disaggregates) Stage (load into staging tables, if used) Audit reports (for example, on compliance with business rules. Also, in case of failure, helps to diagnose/repair) Publish (to target tables) Archive Clean up ..What is meant by 'Build reference data'?

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• How do I search for the comma character within data stored in SQL Server?

  - by Fred

  I have some data that I needs to be searched for the comma character. example entry I need to locate in the field Citation in the Citations table: This is sometimes true, Textual Reference In the end, I'm looking to extract Textual Reference Selecting the column with the data: select Citation from Citations;

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• Is there any difference between "foo is None" and "foo == None"?

  - by Joe Shaw

  Is there any difference between: if foo is None: pass and if foo == None: pass The convention that I've seen in most Python code (and the code I myself write) is the former, but I recently came across code which uses the latter. None is an instance (and the only instance, IIRC) of NoneType, so it shouldn't matter, right? Are there any circumstances in which it might?

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• How to create ActiveX DLL in Visual C++

  - by Eric Lavitsky

  Is there a tutorial/reference for creating an ActiveX DLL in Visual Studio 2008 C++ ? I've got a DLL built with the DLLRegisterServer/UnregisterServer, and it's registered, but I'm having a little trouble figuring out what name to use to reference it (from a vbscript) and how to make sure my functions are exported correctly. Do I have to put my functions in a special class? Thanks!

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• Is it a good idea to define a class within a class in Python?

  - by rmh

  I've sometimes seen code like this: class Something(object): class Else(object): def __init__(self): pass def __init__(self): # Do something with self.Else... pass Is it a good idea to define classes inside related classes? Is this an acceptable way to group related code?

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• Does the compiler optimize the function parameters passed by value?

  - by Naveen

  Lets say I have a function where the parameter is passed by value instead of const-reference. Further, lets assume that only the value is used inside the function i.e. the function doesn't try to modify it. In that case will the compiler will be able to figure out that it can pass the value by const-reference (for performance reasons) and generate the code accordingly? Is there any compiler which does that?

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• Rvalues in C++03

  - by DeadMG

  How can you tell whether or not a given parameter is an rvalue in C++03? I'm writing some very generic code and am in need of taking a reference if possible, or constructing a new object otherwise. Can I overload to take by-value as well as by-reference and have the rvalue returns call the by-value function? Or do I have a very sickening feeling that this is why rvalue references are in C++0x?

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• How to get the cookies in webservice using silverlight application

  - by user334223

  Hi, I have an ASP.Net MVC Application ,from this I pass the .ASPXAUTH cookie to silverlight application . I am able to get this cookie using HtmlPage.Document.Cookies.Split(';');. Now I want to pass this cookie to my webservice through headers ,so that based on this I can authenticate the user .How can I set in silverlight apllication and then get cookies in webservice . Thanks in Advance DNM

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• Target Framework Mismatch

  - by Si Keep

  When adding a reference to a project I sometimes see the message... "The Target Framework version for the project is higher than the current project Target Framework version. Would you like to add this reference to your project anyway?" I understand what the message is indicating but can anyone explain what issues might arise from saying 'Yes'?

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• Decorator that can take both init args and call args?

  - by digitala

  Is it possible to create a decorator which can be __init__'d with a set of arguments, then later have methods called with other arguments? For instance: from foo import MyDecorator bar = MyDecorator(debug=True) @bar.myfunc(a=100) def spam(): pass @bar.myotherfunc(x=False) def eggs(): pass If this is possible, can you provide a working example?

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• Perl and hosts file mapping question?

  - by user275633

  All, I have a hosts file that looks like this: 10.10.10.1 myserver1 myserver1alias 10.10.10.2 myserver2 myserver2alias I'm looking for a way using perl to pass in an argument of myserver1 and have it return myserver1alias, likewise if I pass in myserver2 it should return myserver2alias. Any suggestions?

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