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Check if a table exists in Rails
...e available in Rails 5:
drop_table :kittens, if_exists: true
Reference: https://github.com/rails/rails/pull/16366
And here's the Rails 5 ActiveRecord's CHANGELOG:
Introduce the :if_exists option for drop_table.
Example:
drop_table(:posts, if_exists: true)
That would execute:
DRO...
How to pass macro definition from “make” command line arguments (-D) to C source code?
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Fastest way to convert Image to Byte array
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What's the difference between tilde(~) and caret(^) in package.json?
...for version specificity including the ones referred to in the question -
https://docs.npmjs.com/files/package.json
https://docs.npmjs.com/misc/semver#x-ranges-12x-1x-12-
~version "Approximately equivalent to version" See npm semver - Tilde Ranges & semver (7)
^version "Compatible with versi...
Is $(document).ready necessary?
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@Media min-width & max-width
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EC2 instance types's exact network performance?
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How do I call Objective-C code from Swift?
...ld settings. After that, we can use the Objective-C code.
let manager = AFHTTPRequestOperationManager()
manager.GET(
"http://example.com/resources.json",
parameters: nil,
success: { (operation: AFHTTPRequestOperation!,
responseObject: AnyObject!) in
println("JSON: " + resp...
What does it mean in shell when we put a command inside dollar sign and parentheses: $(command)
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Pandas every nth row
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