Method: ActiveRecord::AttributeMethods::ClassMethods#define_attribute_methods

Defined in:
lib/active_record/attribute_methods.rb

#define_attribute_methods ⇒ Object

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



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# File 'lib/active_record/attribute_methods.rb', line 38

def define_attribute_methods
  unless defined?(@attribute_methods_mutex)
    msg = "It looks like something (probably a gem/plugin) is overriding the " \
          "ActiveRecord::Base.inherited method. It is important that this hook executes so " \
          "that your models are set up correctly. A workaround has been added to stop this " \
          "causing an error in 3.2, but future versions will simply not work if the hook is " \
          "overridden. If you are using Kaminari, please upgrade as it is known to have had " \
          "this problem.\n\n"
    msg << "The following may help track down the problem:"

    meth = method(:inherited)
    if meth.respond_to?(:source_location)
      msg << " #{meth.source_location.inspect}"
    else
      msg << " #{meth.inspect}"
    end
    msg << "\n\n"

    ActiveSupport::Deprecation.warn(msg)

    @attribute_methods_mutex = Mutex.new
  end

  # Use a mutex; we don't want two thread simaltaneously trying to define
  # attribute methods.
  @attribute_methods_mutex.synchronize do
    return if attribute_methods_generated?
    superclass.define_attribute_methods unless self == base_class
    super(column_names)
    column_names.each { |name| define_external_attribute_method(name) }
    @attribute_methods_generated = true
  end
end