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How to get the original value of an attribute in Rails
is there a way to get the original value that an ActiveRecord attribute (=the value that was loaded from the database)?
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Can a dictionary be passed to django models on create?
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If title and body are fields in your model, then you can deliver the keyword arguments in your dictionary using the ** operator.
Assuming your model is called MyModel:
# create instance of model
m = MyModel(**data_dict)
# don't forget to save to database!
m...
Warning the user/local/mysql/data directory is not owned by the mysql user
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If you can't start mysql service in snow leopard, and in the panel prefs appears 'warning the user/local/mysql/data directory is not owned by the mysql user', you have to:
sudo chown -RL root:mysql /usr/local/mysql
sudo chown -R...
How I can delete in VIM all text from current line to end of file?
...of the file. Is it possible (in vim) to delete the rest of the file (from current line to the end of file)?
4 Answers
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What does an underscore in front of an import statement mean?
I saw this example from sqlite3 on GitHub :
4 Answers
4
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How can I add a boolean value to a NSDictionary?
Well, for integers I would use NSNumber . But YES and NO aren't objects, I guess. A.f.a.i.k. I can only add objects to an NSDictionary , right?
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What is the “reactor” in Maven?
I've been reading about Maven reactor and am confused by its terminology usage. I've read that a multi-module is a reactor, that you can manipulate the maven reactor and that the reactor is a plugin. What exactly is the reactor?
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What events does an fire when it's value is changed?
Just wondering whether anyone knows what events an HTML5 <input type="number" /> element fires when its up / down arrows are clicked:
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How did this person code “Hello World” with Microsoft Paint?
I have just seen this within the past few days and cannot figure out how it works. The video I talk about is here :
3 Ans...
How do I combine two data frames?
I'm using Pandas data frames. I have a initial data frame, say D . I extract two data frames from it like this:
6 Answers
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