Set up a coercion rule such that any time the specified key is set it will be coerced into the specified class. Coercion will occur by first attempting to call Class.coerce and then by calling Class.new with the value as an argument in either case.
@param [Object] key the key or array of keys you would like to be coerced. @param [Class] into the class into which you want the key(s) coerced.
@example Coerce a “user” subhash into a User object
class Tweet < Hash include Hashie::Extensions::Coercion coerce_key :user, User end
# File lib/hashie/extensions/coercion.rb, line 63 def coerce_key(*attrs) @key_coercions ||= {} into = attrs.pop attrs.each { |key| @key_coercions[key] = into } end
Set up a coercion rule such that any time a value of the specified type is set it will be coerced into the specified class.
@param [Class] from the type you would like coerced. @param [Class] into the class into which you would like the value coerced. @option options [Boolean] :strict (true) whether use exact source class only or include ancestors
@example Coerce all hashes into this special type of hash
class SpecialHash < Hash include Hashie::Extensions::Coercion coerce_value Hash, SpecialHash def initialize(hash = {}) super hash.each_pair do |k,v| self[k] = v end end end
# File lib/hashie/extensions/coercion.rb, line 102 def coerce_value(from, into, options = {}) options = { strict: true }.merge(options) if options[:strict] (@strict_value_coercions ||= {})[from] = into else while from.superclass && from.superclass != Object (@lenient_value_coercions ||= {})[from] = into from = from.superclass end end end
Returns the specific key coercion for the specified key, if one exists.
# File lib/hashie/extensions/coercion.rb, line 78 def key_coercion(key) key_coercions[key.to_sym] end
Returns a hash of any existing key coercions.
# File lib/hashie/extensions/coercion.rb, line 72 def key_coercions @key_coercions || {} end
Return all value coercions that have the :strict rule as false.
# File lib/hashie/extensions/coercion.rb, line 120 def lenient_value_coercions @value_coercions || {} end
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