relationship

问题 I'm using cakephp and would like to display all Submissions which are part of Category 'X' I have 4 tables with a HABTM relationship. Users -> (haveMany) -> Submissions <-> (hasAndBelongsToMany) <-> Categories but I would like to do so using the $this->paginate() and for each submission I would like to display the user who posted the submission. User Table Id | Name -----+------------------- 1 | User 1 2 | User 2 Submission Table Id | Name | User_id -----+-------------------+-------------- 1

问题 I'm using cakephp and would like to display all Submissions which are part of Category 'X' I have 4 tables with a HABTM relationship. Users -> (haveMany) -> Submissions <-> (hasAndBelongsToMany) <-> Categories but I would like to do so using the $this->paginate() and for each submission I would like to display the user who posted the submission. User Table Id | Name -----+------------------- 1 | User 1 2 | User 2 Submission Table Id | Name | User_id -----+-------------------+-------------- 1

问题 What inverse_of does mean in mongoid associations? What I can get by using it instead of just association without it? 回答1: In a simple relation, two models can only be related in a single way, and the name of the relation is automatically the name of the model it is related to. This is fine in most cases, but isn't always enough. inverse_of allows you to specify the relation you are referring to. This is helpful in cases where you want to use custom names for your relations. For example:

问题 I know this question is asked by many people already for my research, here's some questions asked before How to delete all relationships in neo4j graph? https://groups.google.com/forum/#!topic/neo4j/lgIaESPgUgE But after all, still can't solve our problems, we just want to delete "ALL" nodes and "ALL" relationships suppose delete "ALL" can see there are left 0 nodes 0 properties and 0 relationships This is the screenshot i took after executing the delete "ALL" suggested by forum My question

问题 I know this question is asked by many people already for my research, here's some questions asked before How to delete all relationships in neo4j graph? https://groups.google.com/forum/#!topic/neo4j/lgIaESPgUgE But after all, still can't solve our problems, we just want to delete "ALL" nodes and "ALL" relationships suppose delete "ALL" can see there are left 0 nodes 0 properties and 0 relationships This is the screenshot i took after executing the delete "ALL" suggested by forum My question

问题 I have 2 entities. entity 1 - People entity 2 - books People entity has a property which is an array of string names of their favorite books. I need to create a relationship that somehow maps the favorite book of a person to the corresponding book entity object(s). I am not sure how to do this. So far I have started by creating a relationship in core data model for people by setting destination to "books" and then for the books entity creating a relationship by setting destination to "people"

问题 i am new for propel . i face a problem to fetch all record form both table which have many to many relation . i have a user and group table. and a join table user_group. user and group have many to many relation i and using follow method to find all related data in a single query . schema.xml file <table name="user" phpName="User" idMethod="native"> <column name="id" type="INTEGER" primaryKey="true" autoIncrement="true" required="true" /> <column name="name" type="VARCHAR" size="100" required

问题 How would one best implement a many-to-many, self-referential, non symmetrical relationship (think Twitter) in SqlAlchemy? I want to use an association object (let's call this class "Follow") so that I can have additional attributes associated with the relationship. I've seen plenty of examples which use an association tables, but none like I've describe above. Here's what I have so far: class UserProfile(Base): __tablename__ = 'user' id = Column(Integer, primary_key=True) full_name = Column

问题 I have three models: User, Product, Offer and a problem with the relationship between these models. Scenario: User 1 posts a product User 2 can send User 1 an offer with an price e.g $ 10 User 1 can accept or reject the offer My questions are now: What is the right relationship between User, Product and Offer? How can I handle those "accept or reject" actions? Is there maybe a better solution? User model: class User < ActiveRecord::Base attr_accessible :name, :email, :password, :password

问题 DISCLAIMER: this is a copy paste from an older stackoverflow post that isn't available anymore, but I have exaclty the same problem, so it seemed appropriate to repost it as it was never answered. I have a stored procedure that will return 4 result sets (contacts, addresses, email, phones) which is populated into a dataset. I would like to use AutoMapper to populate a complex object. public class Contact { public Guid ContactId { get; set; } public string FirstName { get; set; } public string