Class: FormObj::Struct::Attribute

Inherits:
Object
  • Object
show all
Defined in:
lib/form_obj/struct/attribute.rb

Direct Known Subclasses

Form::Attribute

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, array: false, class: nil, default: nil, parent:, primary_key: nil, &block) ⇒ Attribute

Returns a new instance of Attribute.

Raises:

  • (ArgumentError) 


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# File 'lib/form_obj/struct/attribute.rb', line 6

def initialize(name, array: false, class: nil, default: nil, parent:, primary_key: nil, &block)
  @name = name.to_sym
  @array = array
  @default_value = default
  @parent = parent

  @nested_class = binding.local_variable_get(:class)
  @nested_class = @nested_class.constantize if @nested_class.is_a? String
  @nested_class = Class.new(@parent.nested_class, &block) if !@nested_class && block_given?

  raise ArgumentError.new('Nested structure has to be defined (either with :class parameter or with block) for arrays if :default parameter is not specified') if @array && @nested_class.nil? && @default_value.nil?

  if primary_key
    if @nested_class
      @nested_class.primary_key = primary_key
    else
      parent.primary_key = name.to_sym
    end
  end

  if @array && @nested_class._attributes.find(@nested_class.primary_key).nil?
    raise FormObj::NonexistentPrimaryKeyError.new("#{@nested_class.inspect} has no attribute :#{@nested_class.primary_key} which is specified/defaulted as primary key")
  end
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/form_obj/struct/attribute.rb', line 4

def name
  @name
end

Instance Method Details

#default_value ⇒ Object 



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# File 'lib/form_obj/struct/attribute.rb', line 53

def default_value
  if @default_value.nil?
    if @nested_class
      if @array
        create_array
      else
        create_nested
      end
    end

  else
    value = if @default_value.is_a? ::Proc
              @default_value.call(@parent, self)
            else
              @default_value
            end

    if @nested_class
      if @array
        raise FormObj::WrongDefaultValueClassError unless value.is_a? ::Array
        value = create_array(value.map do |val|
          val = create_nested(val) if val.is_a?(::Hash)
          raise FormObj::WrongDefaultValueClassError if val.class != @nested_class
          val
        end)
      else
        value = create_nested(value) if value.is_a? ::Hash
        raise FormObj::WrongDefaultValueClassError if value.class != @nested_class
      end
    end

    value
  end
end

#subform? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/form_obj/struct/attribute.rb', line 31

def subform?
  !@nested_class.nil?
end

#validate_value!(value) ⇒ Object 



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# File 'lib/form_obj/struct/attribute.rb', line 35

def validate_value!(value)
  if @nested_class
    if @array
      unless value.class == @parent.array_class
        raise ArgumentError.new(":#{@name} attribute value should be of class #{@parent.nested_class.name}::Array while attempt to assign value of class #{value.class.name}")
      end
      unless value.item_class == @nested_class
        raise ArgumentError.new(":#{@name} attribute value should be an array with items of class #{@nested_class.name} while attempt to assign an array with items of class #{value.item_class.name}")
      end

    else
      unless value.class == @nested_class
        raise ArgumentError.new(":#{@name} attribute value should be of class #{@nested_class.name} while attempt to assign value of class #{value.class.name}")
      end
    end
  end
end