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How to set default values in Rails?
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"Correct" is a dangerous word in Ruby. There's usually more than one way to do anything. If you know you'll always want that default value for that column on that table, setting them in a DB migration file is the easiest way:
class SetDefault < ActiveRecord::Migration
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What is the difference between “ is None ” and “ ==None ”
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class Foo:
def __eq__(self,other):
return True
foo=Foo()
print(foo==None)
# True
print(foo is None)
# False
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Proper package naming for testing with the Go language
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I forked a package and made changes, and now my tests are all trying to import the original repo instead of my forked package. With Strategy 3, I don't have to change the "github.com/original/link" to "github.com/my/fork", because it's just referencing '.' instead.
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Constructor overload in TypeScript
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TypeScript allows you to declare overloads but you can only have one implementation and that implementation must have a signature that is compatible with all overloads. In your example, this can easily be done with an optional parameter...
How can I visualize per-character differences in a unified diff file?
...taining the diff, make sure that you're in diff-mode (if the file is named foo.diff or foo.patch this happens automatically; otherwise type M-x diff-mode RET), go to the hunk you are interested in and hit C-c C-b for refine-hunk. Or step through the file one hunk at a time with M-n; that will do th...
Why have header files and .cpp files? [closed]
...dencies so that code that uses the header doesn't necessarily need to know all the details of the implementation and any other classes/headers needed only for that. This will reduce compilation times and also the amount of recompilation needed when something in the implementation changes.
It's not ...
Return None if Dictionary key is not available
...f __getitem__(self, key):
return dict.get(self, key)
>>> foo = NoneDict([(1,"asdf"), (2,"qwerty")])
>>> foo[1]
'asdf'
>>> foo[2]
'qwerty'
>>> foo[3] is None
True
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What does %w(array) mean?
....], curly braces %w{...} or even something like exclamation marks %w!...!. All of these have the same behavior (returning an array).
– ryanb
Aug 13 '09 at 21:40
146
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Create nice column output in python
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This will make all columns the same width, which is not what column -t does.
– intuited
Dec 5 '12 at 0:54
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Is there a way of having git show lines added, lines changed and lines removed?
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If all of your files are staged for commit, to see the --numstat go like this:
git diff --numstat HEAD~
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