Class: JsonRecord::JsonField

Inherits:
Object
  • Object
show all
Includes:
AttributeMethods
Defined in:
lib/json_record/json_field.rb

Instance Method Summary collapse

Methods included from AttributeMethods

#read_attribute, #write_attribute

Constructor Details

#initialize(record, name, schemas) ⇒ JsonField

Returns a new instance of JsonField.

Raises:

  • (ArgumentError) 

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# File 'lib/json_record/json_field.rb', line 7

def initialize (record, name, schemas)
  @record = record
  @name = name.to_s
  @schemas = schemas
  @attributes = nil
  json_column = record.class.columns_hash[@name]
  raise ArgumentError.new("column #{name} does not exist in #{table_name}") unless json_column
  @compressed = json_column.type == :binary
end

Instance Method Details

#changed_attributes ⇒ Object 


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# File 'lib/json_record/json_field.rb', line 67

def changed_attributes
  @record.instance_variable_get(:@changed_attributes)
end

#changes ⇒ Object 


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# File 'lib/json_record/json_field.rb', line 63

def changes
  @record.changes
end

#deserialize ⇒ Object 


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# File 'lib/json_record/json_field.rb', line 27

def deserialize
  @attributes = {}
  @schemas.each do |schema|
    schema.fields.values.each do |field|
      @attributes[field.name] = field.multivalued? ? EmbeddedDocumentArray.new(field.type, @record) : field.default
    end
  end
  
  unless @record[@name].blank?
    json = @record[@name]
    json = Zlib::Inflate.inflate(json) if @compressed
    do_not_track_changes = Thread.current[:do_not_track_json_field_changes]
    Thread.current[:do_not_track_json_field_changes] = true
    begin
      ActiveSupport::JSON.decode(json).each_pair do |attr_name, attr_value|
        setter = "#{attr_name}=".to_sym
        if @record.respond_to?(setter)
          @record.send(setter, attr_value)
        else
          field = nil
          @schemas.each{|schema| field = schema.fields[attr_name]; break if field}
          field = FieldDefinition.new(attr_name, :type => attr_value.class) unless field
          write_attribute(field, attr_value, @record)
        end
      end
    ensure
      Thread.current[:do_not_track_json_field_changes] = do_not_track_changes
    end
  end
end

#json_attributes ⇒ Object 


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# File 'lib/json_record/json_field.rb', line 58

def json_attributes
  deserialize unless @attributes
  @attributes
end

#serialize ⇒ Object 


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# File 'lib/json_record/json_field.rb', line 17

def serialize
  if @attributes
    stripped_attributes = {}
    @attributes.each_pair{|k, v| stripped_attributes[k] = v unless v.blank?}
    json = stripped_attributes.to_json
    json = Zlib::Deflate.deflate(json) if json and @compressed
    @record[@name] = json
  end
end