associations – Page 5

What is causing this ActiveRecord::ReadOnlyRecord error?

October 15, 2022 by Tarik

Rails 2.3.3 and lower From the ActiveRecord CHANGELOG(v1.12.0, October 16th, 2005): Introduce read-only records. If you call object.readonly! then it will mark the object as read-only and raise ReadOnlyRecord if you call object.save. object.readonly? reports whether the object is read-only. Passing :readonly => true to any finder method will mark returned records as read-only. The … Read more

What is the difference between association, aggregation and composition?

September 13, 2022 by Tarik

For two objects, Foo and Bar the relationships can be defined Association – I have a relationship with an object. Foo uses Bar public class Foo { private Bar bar; }; NB: See Fowler’s definition – the key is that Bar is semantically related to Foo rather than just a dependency (like an int or … Read more