Class: Enumerize::Attribute

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass, name, options = {}) ⇒ Attribute

Returns a new instance of Attribute.

Raises:

  • (ArgumentError) 


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# File 'lib/enumerize/attribute.rb', line 5

def initialize(klass, name, options={})
  raise ArgumentError, ':in option is required' unless options[:in]
  raise ArgumentError, ':scope option does not work with option :multiple' if options[:multiple] && options[:scope]

  extend Multiple if options[:multiple]

  @klass  = klass
  @name   = name.to_sym

  value_class = options.fetch(:value_class, Value)
  @values = Array(options[:in]).map { |v| value_class.new(self, *v) }

  @value_hash = Hash[@values.map { |v| [v.value.to_s, v] }]
  @value_hash.merge! Hash[@values.map { |v| [v.to_s, v] }]

  if options[:i18n_scope]
    raise ArgumentError, ':i18n_scope option accepts only String or Array of strings' unless Array(options[:i18n_scope]).all? { |s| s.is_a?(String) }
    @i18n_scope = options[:i18n_scope]
  end

  if options[:default]
    @default_value = find_default_value(options[:default])
    raise ArgumentError, 'invalid default value' unless @default_value
  end
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method) ⇒ Object (private) 



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# File 'lib/enumerize/attribute.rb', line 127

def method_missing(method)
  if @value_hash.include?(method.to_s)
    find_value(method)
  else
    super
  end
end

Instance Attribute Details

#default_value ⇒ Object (readonly)

Returns the value of attribute default_value.



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# File 'lib/enumerize/attribute.rb', line 3

def default_value
  @default_value
end

#i18n_scope ⇒ Object (readonly)

Returns the value of attribute i18n_scope.



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# File 'lib/enumerize/attribute.rb', line 3

def i18n_scope
  @i18n_scope
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/enumerize/attribute.rb', line 3

def name
  @name
end

#values ⇒ Object (readonly)

Returns the value of attribute values.



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# File 'lib/enumerize/attribute.rb', line 3

def values
  @values
end

Instance Method Details

#define_methods!(mod) ⇒ Object 



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# File 'lib/enumerize/attribute.rb', line 82

def define_methods!(mod)
  mod.module_eval <<-RUBY, __FILE__, __LINE__ + 1
    def #{name}
      if defined?(super)
        self.class.enumerized_attributes[:#{name}].find_value(super)
      elsif respond_to?(:read_attribute)
        self.class.enumerized_attributes[:#{name}].find_value(read_attribute(:#{name}))
      else
        if defined?(@#{name})
          self.class.enumerized_attributes[:#{name}].find_value(@#{name})
        else
          @#{name} = nil
        end
      end
    end

    def #{name}=(new_value)
      allowed_value_or_nil = self.class.enumerized_attributes[:#{name}].find_value(new_value)
      allowed_value_or_nil = allowed_value_or_nil.value unless allowed_value_or_nil.nil?

      if defined?(super)
        super allowed_value_or_nil
      elsif respond_to?(:write_attribute, true)
        write_attribute '#{name}', allowed_value_or_nil
      else
        @#{name} = allowed_value_or_nil
      end

      _enumerized_values_for_validation['#{name}'] = new_value.nil? ? nil : new_value.to_s

      allowed_value_or_nil
    end

    def #{name}_text
      self.#{name} && self.#{name}.text
    end

    def #{name}_value
      self.#{name} && self.#{name}.value
    end
  RUBY
end

#find_default_value(value) ⇒ Object 



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# File 'lib/enumerize/attribute.rb', line 31

def find_default_value(value)
  if value.respond_to?(:call)
    value
  else
    find_value(value)
  end
end

#find_value(value) ⇒ Object 



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# File 'lib/enumerize/attribute.rb', line 39

def find_value(value)
  @value_hash[value.to_s] unless value.nil?
end

#find_values(*values) ⇒ Object 



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# File 'lib/enumerize/attribute.rb', line 43

def find_values(*values)
  values.map { |value| find_value(value) }.compact
end

#i18n_scopes ⇒ Object 



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# File 'lib/enumerize/attribute.rb', line 47

def i18n_scopes
  @i18n_scopes ||= if i18n_scope
    scopes = Array(i18n_scope)
  elsif @klass.respond_to?(:model_name)
    scopes = ["enumerize.#{@klass.model_name.i18n_key}.#{name}"]
  else
    []
  end
end

#options(options = {}) ⇒ Object 



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# File 'lib/enumerize/attribute.rb', line 57

def options(options = {})
  values = if options.empty?
    @values
  else
    raise ArgumentError, 'Options cannot have both :only and :except' if options[:only] && options[:except]

    only = Array(options[:only]).map(&:to_s)
    except = Array(options[:except]).map(&:to_s)

    @values.reject do |value|
      if options[:only]
        !only.include?(value)
      elsif options[:except]
        except.include?(value)
      end
    end
  end

  values.map { |v| [v.text, v.to_s] }
end

#respond_to_missing?(method, include_private = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/enumerize/attribute.rb', line 78

def respond_to_missing?(method, include_private=false)
  @value_hash.include?(method.to_s) || super
end