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How to reset a single table in rails?
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A lot of people (like me) come here to find how to delete all the data in the table. Here you go:
$ rails console
> ModelName.delete_all
or
> ModelName.destroy_all
destroy_all checks dependencies and callbacks, and takes a little longer.
delete_all is a straight SQL que...
List of installed gems?
Is there a Ruby method I can call to get the list of installed gems?
11 Answers
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Why does X[Y] join of data.tables not allow a full outer join, or a left join?
...Y) does both ways at the same time. The number of rows of X[Y] and Y[X] usually differ, whereas the number of rows returned by merge(X,Y) and merge(Y,X) is the same.
BUT that misses the main point. Most tasks require something to be done on the
data after a join or merge. Why merge all the co...
Enable the display of line numbers in Visual Studio
...al Studio has line numbering:
Tools -> Options -> Text Editor -> All Languages -> check the "Line numbers" checkbox.
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Display / print all rows of a tibble (tbl_df)
...ame manipulation package in R. It prevents long table outputs when accidentally calling the data frame.
7 Answers
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find all unchecked checkbox in jquery
...cked'));
}
}
);
You can then use $("input:unchecked") to get all checkboxes and radio buttons that are checked.
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Delete all but the most recent X files in bash
...n a pretty standard UNIX environment with bash, to run a command to delete all but the most recent X files from a directory?
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Junit - run set up method once
...Before I would like to have a setup method that executes only once before all tests. Is that possible with Junit 4.8?
10 A...
At runtime, find all classes in a Java application that extend a base class
...is helpful link to the great package "org.reflections"! With that I've finally found a practicable and neat solution for my problem.
– Hartmut P.
Jul 7 '15 at 13:15
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Entity Framework - Start Over - Undo/Rollback All Migrations
...oint where I just want to start over, so is there a way to completely undo all migrations, erase the history, and delete the migration code, so I'm back to square one?
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