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Tag: v2.0.1
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module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module Hash #:nodoc:
module Keys
# Return a new hash with all keys converted to strings.
def stringify_keys
inject({}) do |options, (key, value)|
options[key.to_s] = value
options
end
end
# Destructively convert all keys to strings.
def stringify_keys!
keys.each do |key|
unless key.class.to_s == "String" # weird hack to make the tests run when string_ext_test.rb is also running
self[key.to_s] = self[key]
delete(key)
end
end
self
end
# Return a new hash with all keys converted to symbols.
def symbolize_keys
inject({}) do |options, (key, value)|
options[key.to_sym || key] = value
options
end
end
# Destructively convert all keys to symbols.
def symbolize_keys!
keys.each do |key|
unless key.is_a?(Symbol) || (new_key = key.to_sym).nil?
self[new_key] = self[key]
delete(key)
end
end
self
end
alias_method :to_options, :symbolize_keys
alias_method :to_options!, :symbolize_keys!
# Validate all keys in a hash match *valid keys, raising ArgumentError on a mismatch.
# Note that keys are NOT treated indifferently, meaning if you use strings for keys but assert symbol
# as keys, this will fail.
# examples:
# { :name => "Rob", :years => "28" }.assert_valid_keys(:name, :age) # => raises "ArgumentError: Unknown key(s): years"
# { :name => "Rob", :age => "28" }.assert_valid_keys("name", "age") # => raises "ArgumentError: Unknown key(s): years, name"
# { :name => "Rob", :age => "28" }.assert_valid_keys(:name, :age) # => passes, raises nothing
def assert_valid_keys(*valid_keys)
unknown_keys = keys - [valid_keys].flatten
raise(ArgumentError, "Unknown key(s): #{unknown_keys.join(", ")}") unless unknown_keys.empty?
end
end
end
end
end
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