Class: Kvom::Adapter::Attributes

Inherits:
Object
  • Object
show all
Defined in:
lib/kvom/adapter/attributes.rb

Instance Method Summary collapse

Constructor Details

#initialize(attributes, from_db = false) ⇒ Attributes

Returns a new instance of Attributes.



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# File 'lib/kvom/adapter/attributes.rb', line 7

def initialize(attributes, from_db = false)
  if from_db
    meta = attributes && attributes.delete("@meta.json")
    @coding = meta && MultiJson.load(meta)["coding"] || {}
    @coded_attributes = attributes
    @attributes = {}
  else
    @coding = {}
    @coded_attributes = {}
    @attributes = attributes ? attributes.dup : {}
  end
end

Instance Method Details

#[](name) ⇒ Object 



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# File 'lib/kvom/adapter/attributes.rb', line 20

def [](name)
  return @attributes[name] if @attributes.key?(name)
  coded_value = @coded_attributes[name]
  @attributes[name] =
      case @coding[name]
      when nil
        coded_value
      when "json"
        MultiJson.load(coded_value)
      when "jsonvalue"
        ::Kvom::Lib::JsonValue.load(coded_value)
      else
        raise "Unexpected coding #{@coding[name]} for attribute #{name}"
      end
end

#[]=(name, value) ⇒ Object 



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# File 'lib/kvom/adapter/attributes.rb', line 36

def []=(name, value)
  @coding.delete(name)
  @coded_attributes.delete(name)
  @attributes[name] = value
end

#to_h ⇒ Object 



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# File 'lib/kvom/adapter/attributes.rb', line 42

def to_h
  @attributes.each do |(name, value)|
    next if @coded_attributes.key?(name)
    if value == nil
      # can happen for (the writer bypassing) new(:property => nil)
      @coded_attributes.delete(name)
    else
      @coded_attributes[name] =
          case value
          when "", true, false
            @coding[name] = "jsonvalue"
            ::Kvom::Lib::JsonValue.dump(value)
          when Array, Hash
            @coding[name] = "json"
            MultiJson.dump(value)
          when String, Numeric
            value
          else
            raise UnsupportedValue, "Unsupported value type #{value.class}"
          end
     end
  end

  if @coding.empty?
    @coded_attributes.delete("@meta.json")
  else
    @coded_attributes["@meta.json"] = MultiJson.dump("coding" => @coding)
  end
  @coded_attributes
end