relation

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Django Associations with the user model

Ho开发者_高级运维w can I associate lists apps Listing model with an user. User has_many lists.[详细]

2023-03-23 14:05 分类：问答
Many to Many, with another column

I\'m wondering if anyone has faced this issue. Let\'s assume I have two tables: products and carts (related many to many).[详细]

2023-03-23 10:40 分类：问答
How to find sqlalchemy remote side object's class or class name without db queries?

Let\'s have a classes X and Y and relations between them x2y and y2x. From class_mapper(Class).iterate_properties iterator we can get all class\'s properties.[详细]

2023-03-23 10:18 分类：问答
Doctrine ORM Conditional Association

i\'m building a Q&A site and my questions, answers and comments are on the same posts table. But their postType is different. I can get answers for a question and comments for an answer with this[详细]

2023-03-19 13:31 分类：问答
Django generic relation problem

I\'m having problems coming up with a filter in one of my views. I\'m creating a site with blog entries, news articles, and reviews. The entries and articles have generic relations with the reviews, b[详细]

2023-03-18 17:17 分类：问答
Define a custom ordering criteria in the relations() method

I have a model A that has a relationship of type HAS_MANY with model B. B\'s attributes are: id, user_id,[详细]

2023-03-17 02:43 分类：问答
SQL: Order results by (optional) relationship

I have two tables Post (id, ..., creationdate) and Post_Has_Post(parent_id, child_id). Some Posts can be part of a parent<->child relation and have a corresponding entry in the Post_Has_Post-Tabl[详细]

2023-03-16 18:11 分类：问答
PostgreSQL Hierarchical Relationship Functions

CREATE TABLE sectors ( sector_id integer PRIMARY KEY, sector_name varchar(100) NOT NULL, parent_sector_id integer REFERENCES sectors(sector_id)[详细]

2023-03-15 06:47 分类：问答
Using 1:n relations in django admin

I want to build a questionary in Django and use django\'s admin-interface to enter the data. The site-admin should be able to set-up new questionaries with questions. Define models which questions hav[详细]

2023-03-06 17:28 分类：问答
typed dataset, cascade delete of child table records

I have a typed dataset with two tables like this: Table A (Parent Table) IDMessageID 11 21 32 43 Table B (Child Table)[详细]

2023-03-03 02:15 分类：问答