Module: Attribution::ClassMethods

Defined in:
lib/attribution.rb

Instance Method Summary collapse

Instance Method Details

#add_attribute(name, type, metadata = {}) ⇒ Object

Defines an attribute

Parameters:

  • name (String) —

    The name of the attribute

  • type (Symbol) —

    The type of the attribute

  • metadata (Hash{Symbol => Object}) (defaults to: {}) —

    The metadata for the attribute



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# File 'lib/attribution.rb', line 80

def add_attribute(name, type, metadata={})
  attr_reader name
  attributes << (metadata || {}).merge(:name => name.to_sym, :type => type.to_sym)
end

#attribute_names ⇒ Array<Symbol>

Returns The names of the attributes in the order in which they were defined.

Returns:

  • (Array<Symbol>) —

    The names of the attributes in the order in which they were defined



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# File 'lib/attribution.rb', line 69

def attribute_names
  @attribute_names ||= attributes.map{|a| a[:name] }
end

#attributes ⇒ Hash{Symbol => Object}

Returns Each attribute name, type and any related metadata in the order in which they were defined.

Returns:

  • (Hash{Symbol => Object}) —

    Each attribute name, type and any related metadata in the order in which they were defined



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# File 'lib/attribution.rb', line 59

def attributes
  @attributes ||= if superclass && superclass.respond_to?(:attributes)
    superclass.attributes.dup
  else
    []
  end
end

#autoload_associations? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/attribution.rb', line 200

def autoload_associations?
  true
end

#belongs_to(association_name, metadata = {}) ⇒ Object

Defines an attribute that is a reference to another Attribution class.

Parameters:

  • association_name (Symbol) —

    The name of the association

  • metadata (Hash) (defaults to: {}) —

    Extra information about the association.

Options Hash (metadata):

  • :class_name (String) —

    Class of the association, defaults to a class name based on the association name



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# File 'lib/attribution.rb', line 212

def belongs_to(association_name, metadata={})
  # foo_id
  id_getter = "#{association_name}_id".to_sym
  add_attribute(id_getter, :integer, metadata)

  association_class_name = metadata.try(:fetch, :class_name, [name.split('::')[0..-2].join('::'), association_name.to_s.classify].reject(&:blank?).join('::'))

  define_method(id_getter) do
    ivar = "@#{id_getter}"
    if instance_variable_defined?(ivar)
      instance_variable_get(ivar)
    else
      if obj = send(association_name)
        instance_variable_set(ivar, obj.id)
      else
        instance_variable_set(ivar, nil)
      end
    end
  end

  # foo_id=
  define_method("#{id_getter}=") do |arg|
    instance_variable_set("@#{id_getter}", arg.to_i)
  end

  # foo
  define_method(association_name) do
    if instance_variable_defined?("@#{association_name}")
      instance_variable_get("@#{association_name}")
    elsif id = instance_variable_get("@#{association_name}_id")

      begin
        association_class = Object.const_get(association_class_name)
      rescue NameError => ex
        raise ArgumentError.new("Association #{association_name} in #{self.class} is invalid because #{association_class_name} does not exist")
      end

      if self.class.autoload_associations? && association_class.respond_to?(:find)
        instance_variable_set("@#{association_name}", association_class.find(id))
      end
    else
      instance_variable_set("@#{association_name}", nil)
    end
  end

  # foo=
  define_method("#{association_name}=") do |arg|
    begin
      association_class = Object.const_get(association_class_name)
    rescue NameError => ex
      raise ArgumentError.new("Association #{association_name} in #{self.class} is invalid because #{association_class_name} does not exist")
    end

    if instance_variable_defined?("@#{association_name}_id")
      remove_instance_variable("@#{association_name}_id")
    end
    instance_variable_set("@#{association_name}", association_class.cast(arg))
  end
end

#boolean(attr, metadata = {}) ⇒ Object

Defines a boolean attribute

Parameters:

  • attr (Symbol) —

    The name of the attribute

  • metadata (Hash{Symbol => Object}) (defaults to: {}) —

    The metadata for the attribute



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# File 'lib/attribution.rb', line 100

def boolean(attr, metadata={})
  add_attribute(attr, :boolean, metadata)
  define_method("#{attr}=") do |arg|
    v = case arg
    when String then BOOLEAN_TRUE_STRINGS.include?(arg.downcase)
    when Numeric then arg == 1
    when nil then nil
    else !!arg
    end
    instance_variable_set("@#{attr}", v)
  end
  alias_method "#{attr}?", attr
end

#cast(obj) ⇒ Attribution

Returns An instance of this class.

Parameters:

  • obj (Hash, Attribution) —

    The Hash or Object to convert to an instance of this class

Returns:



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# File 'lib/attribution.rb', line 49

def cast(obj)
  case obj
  when Hash then new(obj)
  when self then obj
  else raise ArgumentError.new("can't convert #{obj.class} to #{name}")
  end
end

#date(attr, metadata = {}) ⇒ Object

Defines a date attribute

Parameters:

  • attr (Symbol) —

    The name of the attribute

  • metadata (Hash{Symbol => Object}) (defaults to: {}) —

    The metadata for the attribute



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# File 'lib/attribution.rb', line 151

def date(attr, metadata={})
  add_attribute(attr, :date, metadata)
  define_method("#{attr}=") do |arg|
    v = case arg
    when Date then arg
    when Time, DateTime then arg.to_date
    when String then Date.parse(arg)
    when Hash
      args = Util.extract_values(arg, :year, :month, :day)
      args.present? ? Date.new(*args.map(&:to_i)) : nil
    when nil then nil
    else raise ArgumentError.new("can't convert #{arg.class} to Date")
    end
    instance_variable_set("@#{attr}", v)
  end
end

#decimal(attr, metadata = {}) ⇒ Object

Defines a decimal attribute

Parameters:

  • attr (Symbol) —

    The name of the attribute

  • metadata (Hash{Symbol => Object}) (defaults to: {}) —

    The metadata for the attribute



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# File 'lib/attribution.rb', line 140

def decimal(attr, metadata={})
  add_attribute(attr, :decimal, metadata)
  define_method("#{attr}=") do |arg|
    instance_variable_set("@#{attr}", arg.nil? ? nil : BigDecimal.new(arg.to_s))
  end
end

#float(attr, metadata = {}) ⇒ Object

Defines a float attribute

Parameters:

  • attr (Symbol) —

    The name of the attribute

  • metadata (Hash{Symbol => Object}) (defaults to: {}) —

    The metadata for the attribute



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# File 'lib/attribution.rb', line 129

def float(attr, metadata={})
  add_attribute(attr, :float, metadata)
  define_method("#{attr}=") do |arg|
    instance_variable_set("@#{attr}", arg.nil? ? nil : arg.to_f)
  end
end

#has_many(association_name, metadata = {}) ⇒ Object

Defines an attribute that is a reference to an Array of another Attribution class.

Parameters:

  • association_name (Symbol) —

    The name of the association

  • metadata (Hash) (defaults to: {}) —

    Extra information about the association.

Options Hash (metadata):

  • :class_name (String) —

    Class of the association, defaults to a class name based on the association name



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# File 'lib/attribution.rb', line 278

def has_many(association_name, metadata={})

  association_class_name = metadata.try(:fetch, :class_name, [name.split('::')[0..-2].join('::'), association_name.to_s.singularize.classify].reject(&:blank?).join('::'))

  # foos
  define_method(association_name) do |*query|

    # TODO: Support a more generic version of lazy-loading
    begin
      association_class = Object.const_get(association_class_name)
    rescue NameError => ex
      raise ArgumentError.new("Association #{association_name} in #{self.class} is invalid because #{association_class_name} does not exist")
    end

    if query.empty? # Ex: Books.all, so we want to cache it.
      ivar = "@#{association_name}"
      if instance_variable_defined?(ivar)
        instance_variable_get(ivar)
      elsif self.class.autoload_associations? && association_class.respond_to?(:all)
        instance_variable_set(ivar, Array(association_class.all("#{self.class.name.underscore}_id" => id)))
      end
    else # Ex: Book.all(:name => "The..."), so we do not want to cache it
      if self.class.autoload_associations? && association_class.respond_to?(:all)
        Array(association_class.all({"#{self.class.name.demodulize.underscore}_id" => id}.merge(query.first)))
      end
    end
  end

  # foos=
  define_method("#{association_name}=") do |arg|
    # TODO: put this in method
    begin
      association_class = Object.const_get(association_class_name)
    rescue NameError => ex
      raise ArgumentError.new("Association #{association_name} in #{self.class} is invalid because #{association_class_name} does not exist")
    end

    attr_name = self.class.name.demodulize.underscore
    objs = (arg.is_a?(Hash) ? arg.values : Array(arg)).map do |obj|
      o = association_class.cast(obj)

      if o.respond_to?("#{attr_name}=")
        o.send("#{attr_name}=", self)
      end

      if o.respond_to?("#{attr_name}_id=") && respond_to?(:id)
        o.send("#{attr_name}_id=", id)
      end

      o
    end
    instance_variable_set("@#{association_name}", objs)
  end
end

#integer(attr, metadata = {}) ⇒ Object

Defines a integer attribute

Parameters:

  • attr (Symbol) —

    The name of the attribute

  • metadata (Hash{Symbol => Object}) (defaults to: {}) —

    The metadata for the attribute



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# File 'lib/attribution.rb', line 118

def integer(attr, metadata={})
  add_attribute(attr, :integer, metadata)
  define_method("#{attr}=") do |arg|
    instance_variable_set("@#{attr}", arg.nil? ? nil : arg.to_i)
  end
end

#string(attr, metadata = {}) ⇒ Object

Defines a string attribute

Parameters:

  • attr (Symbol) —

    The name of the attribute

  • metadata (Hash{Symbol => Object}) (defaults to: {}) —

    The metadata for the attribute



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# File 'lib/attribution.rb', line 89

def string(attr, metadata={})
  add_attribute(attr, :string, metadata)
  define_method("#{attr}=") do |arg|
    instance_variable_set("@#{attr}", arg.nil? ? nil : arg.to_s)
  end
end

#time(attr, metadata = {}) ⇒ Object

Defines a time attribute

Parameters:

  • attr (Symbol) —

    The name of the attribute

  • metadata (Hash{Symbol => Object}) (defaults to: {}) —

    The metadata for the attribute



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# File 'lib/attribution.rb', line 172

def time(attr, metadata={})
  add_attribute(attr, :time, metadata)
  define_method("#{attr}=") do |arg|
    v = case arg
    when Date, DateTime then arg.to_time
    when Time then arg
    when String then Time.parse(arg)
    when Hash
      args = Util.extract_values(arg, :year, :month, :day, :hour, :min, :sec, :utc_offset)
      args.present? ? Time.new(*args.map(&:to_i)) : nil
    when nil then nil
    else raise ArgumentError.new("can't convert #{arg.class} to Time")
    end
    instance_variable_set("@#{attr}", v)
  end
end

#time_zone(attr, metadata = {}) ⇒ Object

Defines a time zone attribute, based on ActiveSupport::TimeZone

Parameters:

  • attr (Symbol) —

    The name of the attribute

  • metadata (Hash{Symbol => Object}) (defaults to: {}) —

    The metadata for the attribute



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# File 'lib/attribution.rb', line 193

def time_zone(attr, metadata={})
  add_attribute(attr, :time_zone, metadata)
  define_method("#{attr}=") do |arg|
    instance_variable_set("@#{attr}", arg.nil? ? nil : ActiveSupport::TimeZone[arg.to_s])
  end
end