Module: GeneralUnits::ActiveRecordExtension::ClassMethods

Defined in:
lib/general_units/models/active_record_extension.rb

Instance Method Summary collapse

Instance Method Details

#has_box(*args) ⇒ Object 



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# File 'lib/general_units/models/active_record_extension.rb', line 128

def has_box(*args)
  options = args.extract_options!
  prefix = args.first||:box
  
  class_attribute :_has_box unless defined?(_has_box)
  self._has_box = {prefix => {}}
  
  self._has_box[prefix][:length_field] = length_field = options[:length]||:"#{prefix}_length"
  self._has_box[prefix][:width_field] = width_field = options[:width]||:"#{prefix}_width"
  self._has_box[prefix][:height_field] = height_field = options[:height]||:"#{prefix}_height"
  
  self._has_box[prefix][:unit_field] = unit_field = options[:unit]||:"#{prefix}_unit"
  self._has_box[prefix][:default_unit] = default_unit = options[:default_unit]||:centimeter
  self._has_box[prefix][:default_unit_method] = default_unit_method = options[:default_unit_method]||:"deafult_#{prefix}_unit"
  
  validates_inclusion_of unit_field, :in => Length.units.map {|u| u.code.to_s}, :if => Proc.new {|o| o.send(length_field).present? || o.send(width_field).present? || o.send(height_field).present?}
  
  class_eval <<-EOV
  
    def #{unit_field}=(value)
      if value.to_sym.in?(GeneralUnits::Length.units.map(&:code))
        super(value.to_s) 
      else
        raise ArgumentError, "Unprocessable unit: \#{value.inspect\}"
      end
    end
    
    def #{prefix}
      begin
        if @_#{prefix}.nil? || #{length_field}_changed? || #{width_field}_changed? || #{height_field}_changed? || #{unit_field}_changed?
          @_#{prefix} = GeneralUnits::Box.new(#{length_field}, #{width_field}, #{height_field}, #{unit_field})
        else
          @_#{prefix}
        end
      rescue ArgumentError, TypeError
        nil
      end
    end
    
    def #{prefix}=(value)
      case value
      when GeneralUnits::Box then
        self.#{length_field} = value.length
        self.#{width_field} = value.width
        self.#{height_field} = value.height
        self.#{unit_field} = value.unit.code
      when Array then
        self.#{length_field} = value[0]
        self.#{width_field} = value[1]
        self.#{height_field} = value[2]
        self.#{unit_field} = value[3]||try(:#{default_unit_method})||:#{default_unit}
      when Hash then
        value = value.with_indifferent_access
        self.#{length_field} = value[:length]
        self.#{width_field} = value[:width]
        self.#{height_field} = value[:height]
        self.#{unit_field} = value[:unit]||try(:#{default_unit_method})||:#{default_unit}
      when Numeric then
        self.#{length_field} = value
        self.#{width_field} = value
        self.#{height_field} = value
        self.#{unit_field} = try(:#{default_unit_method})||:#{default_unit}
      when nil then
        self.#{length_field} = nil
        self.#{width_field} = nil
        self.#{height_field} = nil
        self.#{unit_field} = nil
      end
      #{prefix}
    end
  EOV
end

#has_length(*args) ⇒ Object 



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# File 'lib/general_units/models/active_record_extension.rb', line 68

def has_length(*args)
  options = args.extract_options!
  prefix = args.first||:length
  
  class_attribute :_has_length unless defined?(_has_length)
  self._has_length = {prefix => {}}
  
  self._has_length[prefix][:amount_field] = amount_field = options[:amount]||:"#{prefix}_amount"
  self._has_length[prefix][:unit_field] = unit_field = options[:unit]||:"#{prefix}_unit"
  self._has_length[prefix][:default_unit] = default_unit = options[:default_unit]||:centimeter
  self._has_length[prefix][:default_unit_method] = default_unit_method = options[:default_unit_method]||:"deafult_#{prefix}_unit"
  
  validates_inclusion_of unit_field, :in => Length.units.map {|u| u.code.to_s}, :if => Proc.new {|o| o.send(amount_field).present?}
  
  class_eval <<-EOV
  
    def #{unit_field}=(value)
      if value.to_sym.in?(GeneralUnits::Length.units.map(&:code))
        super(value.to_s) 
      else
        raise ArgumentError, "Unprocessable unit: \#{value.inspect\}"
      end
    end
  
    def #{prefix}
      begin
        if @_#{prefix}.nil? || #{amount_field}_changed? || #{unit_field}_changed?
          @_#{prefix} = GeneralUnits::Length.new(#{amount_field}, #{unit_field})
        else
          @_#{prefix}
        end
      rescue ArgumentError, TypeError
        nil
      end
    end
    
    def #{prefix}=(value)
      case value
      when GeneralUnits::Length
        self.#{amount_field} = value.amount
        self.#{unit_field} = value.unit.code
      when Array then
        self.#{amount_field} = value[0]
        self.#{unit_field} = value[1]||try(:#{default_unit_method})||:#{default_unit}
      when Hash then
        value = value.with_indifferent_access
        self.#{amount_field} = value[:amount]
        self.#{unit_field} = value[:unit]||try(:#{default_unit_method})||:#{default_unit}
      when Numeric then
        self.#{amount_field} = value
        self.#{unit_field} = try(:#{default_unit_method})||:#{default_unit}
      when nil then
        self.#{amount_field} = nil
        self.#{unit_field} = nil
      end
      #{prefix}
    end
  EOV
end

#has_weight(*args) ⇒ Object 



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# File 'lib/general_units/models/active_record_extension.rb', line 8

def has_weight(*args)
  options = args.extract_options!
  prefix = args.first||:weight
  
  class_attribute :_has_weight unless defined?(_has_weight)
  self._has_weight = {prefix => {}}
  
  self._has_weight[prefix][:amount_field] = amount_field = options[:amount]||:"#{prefix}_amount"
  self._has_weight[prefix][:unit_field] = unit_field = options[:unit]||:"#{prefix}_unit"
  self._has_weight[prefix][:default_unit] = default_unit = options[:default_unit]||:kilogram
  self._has_weight[prefix][:default_unit_method] = default_unit_method = options[:default_unit_method]||:"deafult_#{prefix}_unit"
  
  validates_inclusion_of unit_field, :in => Weight.units.map {|u| u.code.to_s}, :if => Proc.new {|o| o.send(amount_field).present?}
  
  class_eval <<-EOV
  
    def #{unit_field}=(value)
      if value.to_sym.in?(GeneralUnits::Weight.units.map(&:code))
        super(value.to_s) 
      else
        raise ArgumentError, "Unprocessable unit: \#{value.inspect\}"
      end
    end
  
    def #{prefix}
      begin
        if @_#{prefix}.nil? || #{amount_field}_changed? || #{unit_field}_changed?
          @_#{prefix} = GeneralUnits::Weight.new(#{amount_field}, #{unit_field})
        else
          @_#{prefix}
        end
      rescue ArgumentError, TypeError
        nil
      end
    end
    
    def #{prefix}=(value)
      case value
      when GeneralUnits::Weight
        self.#{amount_field} = value.amount
        self.#{unit_field} = value.unit.code
      when Array then
        self.#{amount_field} = value[0]
        self.#{unit_field} = value[1]||try(:#{default_unit_method})||:#{default_unit}
      when Hash then
        value = value.with_indifferent_access
        self.#{amount_field} = value[:amount]
        self.#{unit_field} = value[:unit]||try(:#{default_unit_method})||:#{default_unit}
      when Numeric then
        self.#{amount_field} = value
        self.#{unit_field} = try(:#{default_unit_method})||:#{default_unit}
      when nil then
        self.#{amount_field} = nil
        self.#{unit_field} = nil
      end
      #{prefix}
    end
  EOV
end