Class: Jason::Encoding::PersistenceHandler::Persistable

Inherits:
PersistenceObject show all
Includes:
Operations::File
Defined in:
lib/jason/encoding/persistable.rb

Instance Attribute Summary

Attributes inherited from PersistenceObject

#persistable_obj

Instance Method Summary collapse

Methods inherited from PersistenceObject

#eigenclass, #instance_method

Constructor Details

#initialize(obj, options = {}) ⇒ Persistable

Returns a new instance of Persistable.



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# File 'lib/jason/encoding/persistable.rb', line 9

def initialize(obj,options={})
  @update           = options.fetch(:update, false)
  super(obj)
end

Instance Method Details

#process_persistence ⇒ Object 



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# File 'lib/jason/encoding/persistable.rb', line 15

def process_persistence
  persisted = true
  begin
    persisted_file_content  = load_from_file(where_to_persist)
    r_objects       =  ActiveSupport::JSON.decode(persisted_file_content)
  rescue MultiJson::DecodeError => de
    r_objects = []
  ensure
    # There was something persisted before. Search for id and replace.
    # (Only if update is true)
    # If not updated, append to objects array.
    unless @update
      as_json = @persistable_obj.send(:as_json)
        
      # persist with relations if given.
      # persist belongs_to
      
      if @persistable_obj.class.ancestors.map(&:to_s).include?("Jason::Relation")
        as_json[@root].each_pair do |key,value|
          next unless key.to_s.include?("_id")
          relation = key.to_s.split("_id").first.to_sym
          reflection = @persistable_obj.class.reflect_on_relation(relation)
          if reflection
            process_method = instance_method("process_#{reflection.type}")
            process_method.bind(self).call(reflection,value)
          end
        end
      end
      r_objects << as_json
    else 
      r_objects.each do |object|
        if object[@root]["id"] == @persistable_obj.send(:id)
          # persist with relations if given.
          object[@root] = @persistable_obj.send(:as_json)[@root]
          break
        end
      end
    end
    persisted = save_to_file(ActiveSupport::JSON.encode(r_objects))
  end
  return persisted
end