Methods
- A
- C
- D
- I
Instance Public methods
attribute_method?(attribute)
Link
Returns true
if attribute
is an attribute method
and table exists, false
otherwise.
class Person < ActiveRecord::Base
end
Person.attribute_method?('name') # => true
Person.attribute_method?(:age=) # => true
Person.attribute_method?(:nothing) # => false
attribute_names()
Link
Returns an array of column names as strings if it's not an abstract class and table exists. Otherwise it returns an empty array.
class Person < ActiveRecord::Base
end
Person.attribute_names
# => ["id", "created_at", "updated_at", "name", "age"]
class_method_defined_within?(name, klass, superklass = klass.superclass)
Link
# File activerecord/lib/active_record/attribute_methods.rb, line 140 def class_method_defined_within?(name, klass, superklass = klass.superclass) # :nodoc if klass.respond_to?(name, true) if superklass.respond_to?(name, true) klass.method(name).owner != superklass.method(name).owner else true end else false end end
dangerous_class_method?(method_name)
Link
A class method is 'dangerous' if it is already (re)defined by Active Record, but not by any ancestors. (So 'puts' is not dangerous but 'new' is.)
instance_method_already_implemented?(method_name)
Link
Raises a ActiveRecord::DangerousAttributeError
exception when
an Active Record method is defined in the model, otherwise
false
.
class Person < ActiveRecord::Base
def save
'already defined by Active Record'
end
end
Person.instance_method_already_implemented?(:save)
# => ActiveRecord::DangerousAttributeError: save is defined by ActiveRecord
Person.instance_method_already_implemented?(:name)
# => false
# File activerecord/lib/active_record/attribute_methods.rb, line 101 def instance_method_already_implemented?(method_name) if dangerous_attribute_method?(method_name) raise DangerousAttributeError, "#{method_name} is defined by Active Record" end if superclass == Base super else # If B < A and A defines its own attribute method, then we don't want to overwrite that. defined = method_defined_within?(method_name, superclass, superclass.generated_attribute_methods) base_defined = Base.method_defined?(method_name) || Base.private_method_defined?(method_name) defined && !base_defined || super end end