102 lines
3.6 KiB
Ruby
102 lines
3.6 KiB
Ruby
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require 'active_support/json'
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module ActiveRecord #:nodoc:
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module Serialization
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class Serializer #:nodoc:
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attr_reader :options
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def initialize(record, options = nil)
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@record = record
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@options = options ? options.dup : {}
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end
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# To replicate the behavior in ActiveRecord#attributes,
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# <tt>:except</tt> takes precedence over <tt>:only</tt>. If <tt>:only</tt> is not set
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# for a N level model but is set for the N+1 level models,
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# then because <tt>:except</tt> is set to a default value, the second
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# level model can have both <tt>:except</tt> and <tt>:only</tt> set. So if
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# <tt>:only</tt> is set, always delete <tt>:except</tt>.
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def serializable_attribute_names
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attribute_names = @record.attribute_names
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if options[:only]
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options.delete(:except)
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attribute_names = attribute_names & Array(options[:only]).collect { |n| n.to_s }
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else
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options[:except] = Array(options[:except]) | Array(@record.class.inheritance_column)
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attribute_names = attribute_names - options[:except].collect { |n| n.to_s }
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end
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attribute_names
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end
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def serializable_method_names
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Array(options[:methods]).inject([]) do |method_attributes, name|
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method_attributes << name if @record.respond_to?(name.to_s)
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method_attributes
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end
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end
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def serializable_names
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serializable_attribute_names + serializable_method_names
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end
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# Add associations specified via the <tt>:includes</tt> option.
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# Expects a block that takes as arguments:
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# +association+ - name of the association
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# +records+ - the association record(s) to be serialized
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# +opts+ - options for the association records
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def add_includes(&block)
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if include_associations = options.delete(:include)
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base_only_or_except = { :except => options[:except],
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:only => options[:only] }
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include_has_options = include_associations.is_a?(Hash)
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associations = include_has_options ? include_associations.keys : Array(include_associations)
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for association in associations
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records = case @record.class.reflect_on_association(association).macro
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when :has_many, :has_and_belongs_to_many
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@record.send(association).to_a
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when :has_one, :belongs_to
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@record.send(association)
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end
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unless records.nil?
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association_options = include_has_options ? include_associations[association] : base_only_or_except
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opts = options.merge(association_options)
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yield(association, records, opts)
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end
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end
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options[:include] = include_associations
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end
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end
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def serializable_record
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returning(serializable_record = {}) do
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serializable_names.each { |name| serializable_record[name] = @record.send(name) }
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add_includes do |association, records, opts|
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if records.is_a?(Enumerable)
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serializable_record[association] = records.collect { |r| self.class.new(r, opts).serializable_record }
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else
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serializable_record[association] = self.class.new(records, opts).serializable_record
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end
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end
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end
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end
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def serialize
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# overwrite to implement
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end
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def to_s(&block)
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serialize(&block)
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end
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end
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end
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end
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require 'active_record/serializers/xml_serializer'
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require 'active_record/serializers/json_serializer'
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