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Rails migration for has_and_belongs_to_many join table
...ny table must match this format. I'm assuming the two models to be joined by has_and_belongs_to_many are already in the DB : apples and oranges:
create_table :apples_oranges, :id => false do |t|
t.references :apple, :null => false
t.references :orange, :null => false
end
# Adding the...
Type.GetType(“namespace.a.b.ClassName”) returns null
... the type exists, it's in a different class library, and i need to get it by string name
– Omu
Dec 1 '09 at 9:58
28
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What does 'const static' mean in C and C++?
... C++ treats namespace variables). In C++, a member marked static is shared by all instances of a given class. Whether it's private or not doesn't affect the fact that one variable is shared by multiple instances. Having const on there will warn you if any code would try to modify that.
If it was st...
What's the difference between the atomic and nonatomic attributes?
...ult behavior (note that it is not actually a keyword; it is specified only by the absence of nonatomic -- atomic was added as a keyword in recent versions of llvm/clang).
Assuming that you are @synthesizing the method implementations, atomic vs. non-atomic changes the generated code. If you are wr...
What is the difference between ELF files and bin files?
The final images produced by compliers contain both bin file and extended loader format ELf file ,what is the difference between the two , especially the utility of ELF file.
...
input type=“submit” Vs button tag are they interchangeable?
...
The <input type="button"> is just a button and won't do anything by itself.
The <input type="submit">, when inside a form element, will submit the form when clicked.
Another useful 'special' button is the <input type="reset"> that will clear the form.
...
Getting the client's timezone offset in JavaScript
...le
Mozilla Date Object reference
Note that not all timezones are offset by whole hours: for example, Newfoundland is UTC minus 3h 30m (leaving Daylight Saving Time out of the equation).
share
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i...
Routing with Multiple Parameters using ASP.NET MVC
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Parameters are directly supported in MVC by simply adding parameters onto your action methods. Given an action like the following:
public ActionResult GetImages(string artistName, string apiKey)
MVC will auto-populate the parameters when given a URL like:
/Arti...
What does !important mean in CSS?
...ule!'
In normal use a rule defined in an external stylesheet is overruled by a style defined in the head of the document, which, in turn, is overruled by an in-line style within the element itself (assuming equal specificity of the selectors). Defining a rule with the !important 'attribute' (?) dis...
Limit number of characters allowed in form input text field
...racters that will be accepted as input. This can be greater that specified by SIZE , in which case the field
will scroll appropriately. The default is unlimited.
<input type="text" maxlength="2" id="sessionNo" name="sessionNum" onkeypress="return isNumberKey(event)" />
However, this may ...