many-to-many

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Creating many-to-many relationships on a nested rails form

I am trying to create Groups, Users and Memberships (the many-to-many relationships) simultaneously. People can add users to the group as they create it and then I want it to route through to a view o[详细]

2023-04-01 21:22 分类：问答
How can I delete the many-to-many relationship between two dynamic objects?

I want to delete the many-to-many relationship between two dynamic entities. I\'ve seen examples using dummy objects, but they were not dynamic. I will not know the object or the name of the objects\[详细]

2023-04-01 14:11 分类：问答
SQL Server database design: Advice on many to many relationship

I am setting up a database and am at a place where I am confusing myself on some many-to-many tables. I am looking for some advice on the best way to design this for performance and scalability.[详细]

2023-04-01 06:00 分类：问答
CoreData - NSPredicate with NSSet

I have a DB with the following relationships: A <<-->> B A: Members table; B: Activities table A Member has many Activities, and each Activity has many Members. So, a many to many relations[详细]

2023-03-31 19:34 分类：问答
How to get fields_for to create new objects and many-to-many relationships simultaneously?

I\'ve been following through these Railscasts and trying to amend the code so it works with Rails 3:[详细]

2023-03-31 18:46 分类：问答
Hibernate Many-to-many association: left hand side collection contains elements, but right hand side collection is empty

I got a problem with a many to many association in my persistence layer. My scenario is the following:[详细]

2023-03-31 16:18 分类：问答
Making entity framework treat views with many-to-many relationships, like it does tables with many-to-many relationships

Ihave three views that I\'ve manually created in the DB. First view is \"Region\", the second is \"FIPS\" and the last is a many-to-many between them called \"Region2FIPS\".These are all views, and I[详细]

2023-03-31 13:38 分类：问答
Why does NHIbernate (Fluent) still execute queries for my Noop properties?

I have a user object that has a many to many relationship with project. In my user mapping, I have this:[详细]

2023-03-31 09:19 分类：问答
CoreData - NSPredicate results if relationship has data

I have a many-to-many relationship between tables, and I populate a tableView with Activities. For that i user a simple NSPredicate like this:[详细]

2023-03-31 09:09 分类：问答
Complex Many-to-Many JPA CriteriaQuery

I have two entities, Ablum and Image, which are in many to many relationship. I wanna make a criteria query that to get all Albums and the counts on how many Images they have.[详细]

2023-03-31 06:18 分类：问答