Class: Hash

Inherits:
Object
  • Object
show all
Defined in:
lib/eve/core_extensions/hash.rb

Instance Method Summary collapse

Instance Method Details

#camelize_keys ⇒ Object 



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# File 'lib/eve/core_extensions/hash.rb', line 26

def camelize_keys
  stringify_keys.rename(inject({}) do |renamed, (key, value)|
    renamed[key.to_s] = key.to_s.camelize
    renamed
  end)
end

#optionalize ⇒ Object Also known as: without_nil_values

Returns a hash that is a copy of this one, except that all nil values have been removed, making them essentially “optional” keys.



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# File 'lib/eve/core_extensions/hash.rb', line 20

def optionalize
  without_values(nil)
end

#rename(to) ⇒ Object

Takes a hash whose keys must match keys in this hash. Those keys will be renamed to match the corresponding value in the specified hash.

Keys not found are ignored.

Returns self.

Example:

{ :a => 1 }.rename(:a => :b)
  => {:b => 1}



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# File 'lib/eve/core_extensions/hash.rb', line 44

def rename(to)
  merge!(inject({}) do |hash, (old_key, value)|
    hash[to[old_key] || old_key] = value
    delete(old_key)
    hash
  end)
end

#without(*keys) ⇒ Object 



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# File 'lib/eve/core_extensions/hash.rb', line 2

def without(*keys)
  keys.flatten!
  inject({}) do |hash, (key, value)|
    hash[key] = value unless keys.include?(key)
    hash
  end
end

#without_values(*values) ⇒ Object 



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# File 'lib/eve/core_extensions/hash.rb', line 10

def without_values(*values)
  values.flatten!
  inject({}) do |hash, (key, value)|
    hash[key] = value unless values.include?(value)
    hash
  end
end