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module ActiveSupport #:nodoc:
module CoreExtensions #:nodoc:
module Hash #:nodoc:
# Allows for reverse merging where its the keys in the calling hash that wins over those in the <tt>other_hash</tt>.
# This is particularly useful for initializing an incoming option hash with default values:
#
# def setup(options = {})
# options.reverse_merge! :size => 25, :velocity => 10
# end
#
# The default <tt>:size</tt> and <tt>:velocity</tt> is only set if the +options+ passed in doesn't already have those keys set.
module ReverseMerge
# Performs the opposite of merge, with the keys and values from the first hash taking precedence over the second.
def reverse_merge(other_hash)
other_hash.merge(self)
end
# Performs the opposite of merge, with the keys and values from the first hash taking precedence over the second.
# Modifies the receiver in place.
def reverse_merge!(other_hash)
replace(reverse_merge(other_hash))
end
alias_method :reverse_update, :reverse_merge!
end
end
end
end
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