Module: Tarte::BakedInAssociations

Defined in:
lib/tarte/baked_in_associations.rb

Instance Method Summary collapse

Instance Method Details

#has_many_baked_in(association_name, methods = nil) ⇒ Object 



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# File 'lib/tarte/baked_in_associations.rb', line 91

def has_many_baked_in(association_name, methods = nil)
  names_constant = association_name.to_s.upcase
  methods[:verb] ||= :has
  
  write_inheritable_hash(:has_many_baked_in_attributes, association_name => methods[:verb])
  
  class_eval <<-EOV
    #{names_constant} = #{methods[:names].inspect}
  
    def #{association_name}=(values)
      return nil unless values
      
      if values.class == Array
        new_mask = (values & #{names_constant}).map { |v| 2**#{names_constant}.index(v) }.sum
      else values
        new_mask = #{names_constant}_GROUPS_MASKS[values]
      end
      raise(Tarte::Errors::NotValidAssociationMask) if new_mask >= #{2**methods[:names].size}
      
      self.#{association_name}_mask = new_mask
    end
    
    def #{association_name}
      #{names_constant}.reject { |v| ((self.#{association_name}_mask || 0) & 2**#{names_constant}.index(v)).zero? }
    end
    
    def #{association_name}_were
      #{names_constant}.reject { |v| ((self.#{association_name}_mask_was || 0) & 2**#{names_constant}.index(v)).zero? }
    end
    
    def #{association_name}_changed?
      self.#{association_name}_mask_changed?
    end
    
    def self.#{association_name}_mask_for(names)
      if names.class == Array
        new_mask = (names & #{names_constant}).map { |v| 2**#{names_constant}.index(v.to_sym) }.sum
        raise(Tarte::Errors::NotValidAssociationMask) if new_mask >= #{2**methods[:names].size}
        new_mask
      else
        #{names_constant}_GROUPS_MASKS[names]
      end
      
    end
  EOV

  methods[:names].each_with_index do |value, index|
    class_eval <<-EOV
      def #{methods[:verb]}_#{value}?
        self.#{association_name}_mask & #{2**index} > 0
      end
    EOV
  end
  
  # Converts arrays of options into masks.
  if methods[:groups]
    hash_with_masks = methods[:groups].merge(methods[:groups]) do |group, member_names|
      (member_names & methods[:names]).map { |m| 2**methods[:names].index(m.to_sym) }.sum
    end
    
    class_eval <<-EOV
      #{names_constant}_GROUPS_MASKS = #{hash_with_masks.inspect}
      
      # Use this method to build scopes
      def self.#{association_name}_condition(condition)
        {:#{association_name}_mask => #{names_constant}_GROUPS_MASKS[condition]}
      end
      
      def #{association_name}_matches(group)
        self.#{association_name}_mask == #{names_constant}_GROUPS_MASKS[group]
      end
      
    EOV
    
    methods[:groups].each_key do |group|
      send(:named_scope, "matching_#{group}", :conditions => {"#{association_name}_mask".to_sym => hash_with_masks[group]})
      send(:named_scope, "with_#{group}", :conditions => ["#{association_name}_mask & ? > 0", hash_with_masks[group]])
      
      class_eval <<-EOV
        def #{association_name}_matches_#{group}?
          self.#{association_name}_mask == #{names_constant}_GROUPS_MASKS[:#{group}]
        end
      EOV
    end
    
  end
end

#has_one_baked_in(association_name, methods = nil) ⇒ Object 



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# File 'lib/tarte/baked_in_associations.rb', line 11

def has_one_baked_in(association_name, methods = nil)
  names_constant = association_name.to_s.pluralize.upcase
  
  write_inheritable_array(:has_one_baked_in_attributes, [association_name])
  
  class_eval <<-EOV
    #{names_constant} = #{methods[:names].inspect}

    def #{association_name}=(value)
      if value
        self.#{association_name}_code = #{names_constant}.index(value)
      else
        self.#{association_name}_code = nil
      end
    end

    def #{association_name}
      if code = #{association_name}_code
        #{names_constant}[code]
      else
        nil
      end
    end

    def #{association_name}_was
      #{names_constant}[self.#{association_name}_code_was]
    end
    
    def #{association_name}_changed?
      self.#{association_name}_code_changed?
    end
    
    def self.#{association_name}_codes_for(names)
      if names.class == Array
        names.map{|n| #{names_constant}.index(n)}
      else
        #{names_constant}_GROUPS_CODES[names]
      end
    end
  EOV
  
  methods[:names].each_with_index do |value, code|
    class_eval <<-EOV
      def #{value}
        self.#{association_name}_code = #{code}
        self
      end

      def #{value}?
        self.#{association_name}_code == #{code}
      end

      def #{value}!
        update_attribute(:#{association_name}_code, #{code})
      end
      
      def #{association_name}_changed_to_#{value}?
        self.#{association_name}_code_changed? && self.#{association_name}_code == #{code}
      end
    EOV
  end
  
  if methods[:groups]
    hash_with_codes = methods[:groups].merge(methods[:groups]) do |group, member_names|
      member_names.map{|n| methods[:names].index(n)}
    end
    class_eval <<-EOV
      #{names_constant}_GROUPS_CODES = #{hash_with_codes.inspect}
      
      def self.#{association_name}_condition(condition)
        {:#{association_name}_code => #{names_constant}_GROUPS_CODES[condition]}
      end
    EOV
    methods[:groups].each_key do |group|
      send(:named_scope, "is_#{group}", :conditions => {"#{association_name}_code" => hash_with_codes[group]})
    end
  end
  
end