i am currently implementing a grails web-app, with a couple of complex forms where modifications on an association graph should be managed \"in-memory\" (that is the http session) as long as the entit
Rails has a has_one :through association that helps set up a one-to-one association with a third model by going through a second model. What is the real use of that besides making a开发者_Python百科 s
I\'m trying to avoid the N+1 queries problem with eager loading, but it\'s not working. The associated models are still being loaded individually.
I have three classes -> Metadata, MetadataValue and MetadataMetadataValue: Metadata private long id; privat开发者_运维知识库e Metadata parent;
I have the following three models: User, Project, and Assignment. A User has_many Projects through an assignment. However, Assignment actually has two foreign keys that relate to a User: user_id (rep
I am developing a complex form that updates several records of one model at once, whilst simultaneously updating an associated model. It looks a bit like this:
Suppose you have a data model that is something like class Question has_and_belongs_to_many :choices end
I am having a problem with an association: Battalion :has_many soldiers Soldiers :has_many primaries I need to do this
I would like to allow users to write commen开发者_Go百科ts on a site.If they are registered users their username is displayed with the comment, otherwise allow them to type in a name which is displaye
I have three models:for the purpose of asking the question, I\'ll call them posts, containertable1 and containertable2.