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How to rollback a specific migration?
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rake db:rollback STEP=1
Is a way to do this, if the migration you want to rollback is the last one applied. You can substitute 1 for however many migrations you want to go back.
For example:
rake db:rollback STEP=5
Will also rollback all the migration that ...
Angular.js programmatically setting a form field to dirty
... my form with a value and I would like to set the field state to $dirty . Doing something like:
11 Answers
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Make xargs execute the command once for each line of input
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The following will only work if you do not have spaces in your input:
xargs -L 1
xargs --max-lines=1 # synonym for the -L option
from the man page:
-L max-lines
Use at most max-lines nonblank input lines per command line.
Trailing blank...
Understanding prototypal inheritance in JavaScript
...ile at the second approach Drive() will exist per instance (Every time you do new Car() the function drive() will be created again). Or different said the first uses the prototype to store the function and the second the constructor. The lookup for functions is constructor and then prototype. So for...
Android - get children inside a View?
... View nextChild = ((ViewGroup) viewGroup).getChildAt(index);
}
Will that do?
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How do I represent a hextile/hex grid in memory?
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Thanks :) That page doesn't cover edges and vertices, but I cover them in the Relationships Between Parts section of my grids article at www-cs-students.stanford.edu/~amitp/game-programming/grids (the diagrams are for square grids but the table ...
How do I remove blank elements from an array?
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There are many ways to do this, one is reject
noEmptyCities = cities.reject { |c| c.empty? }
You can also use reject!, which will modify cities in place. It will either return cities as its return value if it rejected something, or nil if no rej...
Remove Safari/Chrome textinput/textarea glow
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Edit (11 years later): Don't do this unless you're going to provide a fallback to indicate which element is active. Otherwise, this harms accessibility as it essentially removes the indication showing which element in a document has focus. Imagine ...
Should commit messages be written in present or past tense? [closed]
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I think of these messages as they appear to other developers. They don't yet have the changes applied, and there is the implicit question, "what will applying this changeset/patch do?" It will "Fix the XXX bug in YYY"!
For other verbs writing them as a command seems more natural, and works...
How do I programmatically determine if there are uncommitted changes?
...working tree or the index). What's the cleanest and most efficient way to do that? A command that exits with a return value of zero in one case and non-zero in the other would suit my purposes.
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