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