Module: ActiveRecord::AttributeMethods::ClassMethods

### Home Classes Methods

### In Files

- lib/active_record/attribute_methods.rb

### Methods

- #define_attribute_methods
- #defined_activerecord_methods
- #instance_method_already_implemented?

### Files

- README.rdoc

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# ActiveRecord::AttributeMethods::ClassMethods

### Public Instance Methods

define_attribute_methods() click to toggle source

Generates all the attribute related methods for columns in the database accessors, mutators and query methods.

    # File lib/active_record/attribute_methods.rb, line 12
    def define_attribute_methods
      super(columns_hash.keys)
    end

defined_activerecord_methods() click to toggle source

    # File lib/active_record/attribute_methods.rb, line 27
    def defined_activerecord_methods
      active_record = ActiveRecord::Base
      super_klass   = ActiveRecord::Base.superclass
      methods =  active_record.public_instance_methods - super_klass.public_instance_methods
      methods += active_record.private_instance_methods - super_klass.private_instance_methods
      methods += active_record.protected_instance_methods - super_klass.protected_instance_methods
      methods.map {|m| m.to_s }.to_set
    end

instance_method_already_implemented?(method_name) click to toggle source

Checks whether the method is defined in the model or any of its subclasses that also derive from Active Record. Raises DangerousAttributeError if the method is defined by Active Record though.

    # File lib/active_record/attribute_methods.rb, line 19
    def instance_method_already_implemented?(method_name)
      method_name = method_name.to_s
      @_defined_class_methods         ||= ancestors.first(ancestors.index(ActiveRecord::Base)).sum([]) { |m| m.public_instance_methods(false) | m.private_instance_methods(false) | m.protected_instance_methods(false) }.map {|m| m.to_s }.to_set
      @@_defined_activerecord_methods ||= defined_activerecord_methods
      raise DangerousAttributeError, "#{method_name} is defined by ActiveRecord" if @@_defined_activerecord_methods.include?(method_name)
      @_defined_class_methods.include?(method_name)
    end

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