self-reference

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Class method problem with bidirectional self-referential associations

I\'m trying to create an app where users (\'current_user\') rate the compatibility between two other users (\'user1\' and \'user2\'). They can rate compatibility either positively or negatively: ratin[详细]

2023-03-11 20:33 分类：问答
Problem with EF STE and Self-Referencing tables

This is my first post here, so I hope everything is fine. Here is my problem: I have a table in my database called UserTypes. It has:[详细]

2023-03-11 17:40 分类：问答
Ruby method returns nil, problem with self reference

I have defined a method called ccy which takes in a number num, determines the currency (an attribute of the parent Record model) and returns the number multiplied by a conversion factor. Self, in thi[详细]

2023-03-10 22:18 分类：问答
How to model family relationships in rails 3?

I\'m working on a contact database in rails 3.. One thing thats really frustrating is how ugly the family relationship code is..[详细]

2023-03-09 10:59 分类：问答
Returning source objects in self-referencing has_many, :through

Here\'s my User model: class User < ActiveRecord::Base has_many :friends, :class_name => \'Friendship\', :dependent => :destroy[详细]

2023-03-02 18:52 分类：问答
Referencing a derived type inside itself

I have something link this: public abstract class Wrapper<T, TWrapped>: where TWrapped : Wrapper<T, TWrapped>[详细]

2023-03-02 13:05 分类：问答
mysql self-refrencing table returning id of parent and count of children

I have a self referencing table and I want a mysql query that will return only the top most parent (parent = 0) and the number of children belonging to each of those. This is what I have so far, but I[详细]

2023-03-02 03:35 分类：问答
Self-Referencing C Struct [duplicate]

This question already has answers here: Why can't we initialize members inside a structure? (6 answers)[详细]

2023-02-28 11:04 分类：问答
SQLAlchemy Self-referencing Table Cannot Have 0 as Primary Index?

I encountered a very strange problem with SQLAlchemy. I have a model that is self-referencing (adjacency list relationship). I simply copied the model (Node) from the SQLAlchemy tutorial. Here is the[详细]

2023-02-26 23:25 分类：问答
CLEARER UPDATE: self-referencing relationship is not working with datamapper in codeigniter

I read the documentation several times. This is table structure: categories: id controller user_id approved enabled_comments[详细]

2023-02-23 02:00 分类：问答