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class Hash
##
## CONVERTING
##
#
# convert self into a hash, but only include the specified keys
#
def pick(*keys)
keys.map(&:to_s).inject({}) do |hsh, key|
if has_key?(key)
hsh[key] = self[key]
end
hsh
end
end
#
# recursive merging (aka deep merge)
# taken from ActiveSupport::CoreExtensions::Hash::DeepMerge
#
def deep_merge(other_hash)
self.merge(other_hash) do |key, oldval, newval|
oldval = oldval.to_hash if oldval.respond_to?(:to_hash)
newval = newval.to_hash if newval.respond_to?(:to_hash)
oldval.class.to_s == 'Hash' && newval.class.to_s == 'Hash' ? oldval.deep_merge(newval) : newval
end
end
def deep_merge!(other_hash)
replace(deep_merge(other_hash))
end
#
# A recursive symbolize_keys
#
unless Hash.method_defined?(:symbolize_keys)
def symbolize_keys
self.inject({}) {|result, (key, value)|
new_key = case key
when String then key.to_sym
else key
end
new_value = case value
when Hash then symbolize_keys(value)
else value
end
result[new_key] = new_value
result
}
end
end
end
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