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Rails 3 check if attribute changed
...ributes with their original and new values (in an array).
You can check APIDock for which versions supported these methods.
http://apidock.com/rails/ActiveModel/Dirty
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Get image data url in JavaScript?
... the original file, but a re-encoded version. If you need the result to be identical to the original, see Kaiido's answer.
You will need to create a canvas element with the correct dimensions and copy the image data with the drawImage function. Then you can use the toDataURL function to get a dat...
Django migration strategy for renaming a model and relationship fields
...kemigrations myapp command will ask you if you renamed your model. E.g.: Did you rename the myapp.Foo model to Bar? [y/N] If you answer 'y' your migration will contain the migration.RenameModel('Foo', 'Bar') Same counts for the renamed fields :-)
– ceasaro
Apr...
What's the difference between django OneToOneField and ForeignKey?
...del) and ForeignKey(SomeModel, unique=True). As stated in The Definitive Guide to Django:
OneToOneField
A one-to-one relationship. Conceptually, this is similar to a ForeignKey with unique=True, but the "reverse" side of the relation will directly return a single object.
In contrast to th...
Programmatically fire button click event?
...ode, not manually as a user. Is it possible in iOS development? Please provide your suggestions and guide me how to do that.
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Python Requests and persistent sessions
... to understand how to maintain such a session. Additionally, I want to provide a class which keeps the session maintained over different runs of a script (with a cache file). This means a proper "login" is only performed when required (timout or no session exists in cache). Also it supports proxy se...
How can I expand the full path of the current file to pass to a command in Vim?
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The other two answers didn’t work for me (for some reason). However, I found that this combo displays the full path when typed in Normal mode:
Press 1 then CtrlG
Source: “Get the name of the current file” on the Vim Tips Wiki. See also the ...
What is PostgreSQL explain telling me exactly?
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I am mystified why people think slide decks make good technical documentation. A video of the talk might be helpful, but the information density of that slide deck is very close to zero. In the first six slides (1/5th of the total), there is exactly 1 sentenc...
How do I do a 'git status' so it doesn't display untracked files without using .gitignore?
...o
which is equivalent to:
git status --untracked-files=no
It's a bit hidden in the manuals, but the manpage for status says "supports the same options as git-commit", so that's where you'd have to look.
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Hide all warnings in ipython
I need to produce a screencast of an ipython session, and to avoid confusing viewers, I want to disable all warnings emitted by warnings.warn calls from different packages. Is there a way to configure the ipythonrc file to automatically disable all such warnings?
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