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• Django modelform ForeignKey List

  - by Harry

  How do you get each item in the ForeignKey field in a list, for example: class Delegate(models.Model): excursion = models.ForeignKey(Excursion, limit_choices_to = {'is_activity': False}, related_name='excursion', null=True, blank=True) Template: {% for object in formset.excursion_set.all %} {{ object.lable }} etc {% endfor %} My reason is that I don't want the options to display as a dropdown, but in a custom way that I will style etc.

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• How do I specify attributes for a Html.TextBox helper while maintaing the value retreival from ViewD

  - by BigJoe714

  I am using the Html.TextBox helper to create textboxes. I want to set attributes on the textbox, which I understand is done using the following overload: Html.TextBox (string name, object value, object htmlAttributes) However, I want to maintain the functionality where the html helper automatically uses the value from either ViewData or ViewData.Model and I do not see a way to just specify the name and the htmlAttributes. Is this possible?

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• How do SEL and @select work in iphone sdk?

  - by BlueDolphin

  I have one sample code which get SEL from current object, SEL callback = @selector(mymethod:parameter2); And I have method like -(void)mymethod:(id)v1 parameter2;(NSString*)v2 { } Now I need to move mymethod to another object, say myDelegate. I have tried: SEL callback = @selector(myDelegate, mymethod:parameter2); but appears not compiling. Thanks.

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• Instantiating and referencing models in MVC

  - by fig-gnuton

  In MVC, should each model be a globally accessible singleton accessible to any view/controller? Or should the models be singletons that are dependency injected into any component that requires them? Or should a new model instance be created for each component that needs one, in which case events would be used to propagate changes across model instances of the same class?

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• System.identityHashCode() and compacting garbage collectors

  - by FredOverflow

  I was just wondering how System.identityHashCode() is able to always yield the same result for a given object, even if the garbage collector moves it around in memory. Does every object have an additional invisible field storing its identity, independent from its current address?

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• Need a Java map/table with multiple keys to one value. Value is commonly altered

  - by Duncan

  What I need is a collection which allows multiple keys to access a single object. I need to apply frequent alterations to this object. It also must be efficient for 500k+ entries.

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• how to remove duplicate from a list in c# .net

  - by Richa Media and services

  i want to remove duplicate from List<Dictionary<string, object>> val = new List<Dictionary<string, object>>();

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• What does "Contract can't be in try block" mean?

  - by MatthewMartin

  I'm using the 3.5 library for microsoft code contracts public object RetrieveById(int Id) { Contract.Ensures(newObject != null, "object must not be null"); return newProject; //No error message if I move the Contract.Ensures to here //But it isn't asserting/throwing a contract exception here either } I get the compiler message: "Error 18 Contract section within try block in method 'Controller.RetrieveById(System.Int32)'

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• programming in lua, objects

  - by anon

  Sample code: function Account:new (o) o = o or {} -- create object if user does not provide one setmetatable(o, self) self.__index = self return o end taken from: http://www.lua.org/pil/16.1.html What is the purpose of the: self.__index = self line? And why is it executed every time an object is created?

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• Can we instantiate abstract class?

  - by satheesh.droid

  I don't understand whether we can instantiate abstract class by any means because I have read we can inherit the abstract class but in have found we can create an object by calling method of other class.For example LocationProvider is an abstract class but we can create object for the same by calling getProvider() function in LocationManager class. By the following code LocationManager lm=getSystemService(Context.LOCATION_PROVIDER) LocationProvider lp=lm.getProvider("gps");

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• How value objects are saving and loading?

  - by yeraycaballero

  Since there isn't respositories for value objects. How can I load all value objects? Suppose we are modeling a blog application and we have this classes: Post (Entity) Comment (Value object) Tag (Value object) PostsRespository (Respository) I Know that when I save a new post, its tags are saving with it in the same table. But how could I load all tags of all posts. Has PostsRespository got a method to load all tags? I usually do it, but I want to know others opinions

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• In Ruby on Rails, how is view code able to use instance variables that are set inside the controller

  - by Jian Lin

  In Ruby on Rails, how is an ActionView object able to access the instance variables of ActionController object (how is view code able to use instance variables that are set inside the controller code)?

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• Is there any sql interpreter for objects?

  - by Behrooz

  Is there any interpreter that takes a string or even a custom object as input and execute it on my datasource? I cannot use linq to object because query always changes and the report i'm working on, has about 6000 queries which i can reduce to 9 if i find some tool doing that for me. Opensource is very applicable. thanks in advance.

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• Cannot use ternary operator in LINQ query

  - by Nissan Fan

  I can't figure out why I get a Object reference not set to an instance of an object. error if I use a ternary operator in my LINQ query. var courses = from d in somesource orderby d.SourceName, d.SourceType select new { ID = d.InternalCode, Name = string.Format("{0} - {1}{2}", d.InternalCode, d.SourceName, (d.SourceType.Length > 0 ? ", " + d.SourceType : string.Empty)) }; Any thoughts?

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• How do I correlate build configurations in dependant vcproj files with different names?

  - by Tim

  I have a solution file that requires a third party library (open source). The containing solution uses the typical configuration names of "Debug" and "release". The 3rd party one has debug and release configs for both DLL and static libs - their names are not "Debug" and "Release". How do I tell the solution to build the dependency first and how do I correlate which config to the dependant config? i.e. MyProject:Debug should build either 3rdParty:debug_shared or 3rdParty:debug_static

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• Why doesn't HashTable.Contains() just simply return false if it is passed a null?

  - by Nate Pinchot

  I understand why passing a null to HashTable.Contains() doesn't work, but I don't understand what the point of it throwing an ArgumentNullException is - instead of just simply returning false? What is the benefit of throwing the exception (other than to make me do null checks before calling .Contains())? Caused By [System.ArgumentNullException] Key cannot be null. Parameter name: key at System.Collections.Hashtable.ContainsKey(Object key) at System.Collections.Hashtable.Contains(Object key)

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• Does a syntax for this exist? In any language?

  - by Michael

  It seems pretty common to me to have an argument, in a dynamically typed language that is either an Object or a key to lookup that object. For instance when I'm working with a database I might have a method getMyRelatedStuff(person) All I really need to lookup the related stuff is the id of the person so my method could look like this in python: def getMyRelatedStuff(person_or_id): id = person_or_id.id if isinstance(person,User) else person_or_id #do some lookup Or going the other direction: def someFileStuff(file_or_name): file = file_or_name if hasattr(file,'write') else open(file_or_name)

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• .htaccess & mod_rewrite for passing GET parameters

  - by Joel Alejandro

  Currently I use this to pass GET parameters on an "elegant" way: RewriteEngine On RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^([^/]*)/$ index.php?module=$1 [L] RewriteRule ^([^/]*)/([^/]*)/$ index.php?module=$1&object=$2 [L] RewriteRule ^([^/]*)/([^/]*)/([^/]*)/$ index.php?module=$1&object=$2&submodule=$3 [L] This works great for 3 parameters max., (and I'm sure it's seriously ugly). Any way to do the same thing, for n-paremeters?

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• C# - Does foreach() iterate by reference?

  - by sharkin

  Consider this: List<MyClass> obj_list = get_the_list(); foreach( MyClass obj in obj_list ) { obj.property = 42; } Is 'obj' a reference to the corresponding object within the list so that when I change the property the change will persist in the object instance once constructed somewhere?

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• how to find out which textbox is currenlty selected.

  - by abcdefghijklmnopqrstuvwxyz

  I have 3 text-boxes, how do I find out which text-box is currently selected (has focus). I am unable to come up with anything. Public Class Form1 Public activeTextBox As TextBox = CType(Me.ActiveControl, TextBox) Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click activeTextBox.Text = activeTextBox.Text & "This is text 1" End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click activeTextBox.Text = activeTextBox.Text & "This is the text 2" End Sub End Class

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• How do I know if an input sting is a method name of a specific class?

  - by Itay Moav

  Inside an object, I get a string and I have to know if there is a method with the same name in the current object I am in. How do I do that?

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• Fastest way to copy a set (100+) of related SQLAlchemy objects and change attribute on each one

  - by rebus

  I am developing an app that keeps track of items going in and out of factory. For example, lets say you have 3 kinds of plastic coming in, they are mixed in various ratios and then sent out as a new product. So to keep track of this I've created following database structure: This is very simplified overview of my SQLAlchemy models: IN <- RATIO <- OUT <- REPORT ITEMS -> REPORT IN are products coming in, RATIO is various information on measurements, and OUT is a final product. REPORT is basically a header model which has a lot of REPORT ITEMS attached to it, which in turn relate it to OUT products. This would all work perfectly, but IN and RATION values can change. These changes ultimately change the OUT product which would mean the REPORT values would change. So in order to change an attribute on IN object for example I should copy that object with that attribute changed. I would think this is basically a question about database normalization, because i didn't want to duplicate all the IN, RATIO and OUT information by writing it in REPORT ITEMS table for example, but I've came across this problem (well not really a problem but rather a feature I'd like for a user to have). When the attribute on IN object is changed I want related objects (RATIO and OUT) automatically copied and related to a new IN object. So I was thinking something like: Take an existing instance of model IN that needs to change (call it old_in) Create a new one out of it with some attributes changed (call it new_in) Collect all the RATIO objects that are related to old_in Copy each RATIO and relate them to a new_in Collect all the OUT objects that are related to old RATIO Copy each OUT and relate them to a new RATIO Few questions pop to mind when i look at this problem: Should i just duplicate the data, does all this copying even make sense? If it does, should i rather do it in plain SQL? If no what would be the best approach to do it with Python and SQLAlchemy? Any general answer would suffice really, at least a pointer in right direction. I really want to free then end user for hassle of having create new ratios and out products.

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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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• Are there video tutorials on how to analyze the memory footprint of an iPhone app?

  - by mystify

  Are there good video tuts that show how to use this Object Alloc instrument to figure out if my objects and other stuff get freed from memory? Also, I have a bunch of C code and use Core Audio, so those are not really objects but still heavy in memory. Would like to know more about that Object Alloc instrument.

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• Reflection: different ways to retrieve property value

  - by jules

  I'm retrieving an IEnumerable list of properties via following code: BindingFlags bindingFlag = BindingFlags.Instance | BindingFlags.Public; var dataProperties = typeof(myParentObject).GetProperties(bindingFlag); Then I'm iterating through the list and retrieving the value for each property. I've come across two different approaches to doing this, and just wondered what the difference is between them: 1) object propertyValue = property.GetGetMethod().Invoke(myObject, null); 2) object propertValue = property.GetValue(myObject, null)

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