88 lines
2.5 KiB
Ruby
88 lines
2.5 KiB
Ruby
require 'active_support/core_ext/hash/except'
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require 'active_support/core_ext/hash/slice'
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module ActiveModel
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# Provides a basic serialization to a serializable_hash for your object.
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#
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# A minimal implementation could be:
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#
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# class Person
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#
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# include ActiveModel::Serialization
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#
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# attr_accessor :name
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#
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# def attributes
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# @attributes ||= {'name' => 'nil'}
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# end
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#
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# end
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#
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# Which would provide you with:
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#
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# person = Person.new
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# person.serializable_hash # => {"name"=>nil}
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# person.name = "Bob"
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# person.serializable_hash # => {"name"=>"Bob"}
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#
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# You need to declare some sort of attributes hash which contains the attributes
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# you want to serialize and their current value.
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#
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# Most of the time though, you will want to include the JSON or XML
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# serializations. Both of these modules automatically include the
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# ActiveModel::Serialization module, so there is no need to explicitly
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# include it.
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#
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# So a minimal implementation including XML and JSON would be:
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#
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# class Person
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#
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# include ActiveModel::Serializers::JSON
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# include ActiveModel::Serializers::Xml
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#
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# attr_accessor :name
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#
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# def attributes
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# @attributes ||= {'name' => 'nil'}
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# end
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#
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# end
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#
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# Which would provide you with:
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#
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# person = Person.new
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# person.serializable_hash # => {"name"=>nil}
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# person.to_json # => "{\"name\":null}"
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# person.to_xml # => "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<serial-person...
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#
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# person.name = "Bob"
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# person.serializable_hash # => {"name"=>"Bob"}
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# person.to_json # => "{\"name\":\"Bob\"}"
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# person.to_xml # => "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<serial-person...
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module Serialization
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def serializable_hash(options = nil)
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options ||= {}
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options[:only] = Array.wrap(options[:only]).map { |n| n.to_s }
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options[:except] = Array.wrap(options[:except]).map { |n| n.to_s }
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attribute_names = attributes.keys.sort
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if options[:only].any?
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attribute_names &= options[:only]
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elsif options[:except].any?
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attribute_names -= options[:except]
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end
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method_names = Array.wrap(options[:methods]).inject([]) do |methods, name|
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methods << name if respond_to?(name.to_s)
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methods
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end
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(attribute_names + method_names).inject({}) { |hash, name|
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hash[name] = send(name)
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hash
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}
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end
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end
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end
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