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How do I make a column unique and index it in a Ruby on Rails migration?
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The short answer for old versions of Rails (see other answers for Rails 4+):
add_index :table_name, :column_name, unique: true
To index multiple columns together, you pass an array of column names instead of a single column name,
add_index :table_name, [:column_name_a, :column_name_b], unique...
Convert Int to String in Swift
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Converting Int to String:
let x : Int = 42
var myString = String(x)
And the other way around - converting String to Int:
let myString : String = "42"
let x: Int? = myString.toInt()
if (x != nil) {
// Successfully converted String to Int
}
Or if you're usi...
Ignore python multiple return value
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Brian ClapperBrian Clapper
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bundle install fails with SSL certificate verification error
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WillWill
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How do you round a float to two decimal places in jruby
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steenslagsteenslag
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TFS Code Reviews - Show updated files in response to comments
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4 Answers
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Jackson with JSON: Unrecognized field, not marked as ignorable
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answered Sep 25 '11 at 14:13
Ariel KoganAriel Kogan
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How can I make a UITextField move up when the keyboard is present - on starting to edit?
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is it possible to `git status` only modified files?
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answered Apr 4 '12 at 20:26
Lily BallardLily Ballard
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Java Naming Convention with Acronyms [closed]
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Since it looks like the answer is that there is no single standard for this in Java, I'd like t...