relationship

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

问题 I have the following relations set up: class Page { public function comments() { return $this->hasMany('Comment'); } } class Comment { public function page() { return $this->belongsTo('Page'); } } Pretty bog standard. One page can have many comments, and one comment belongs to a single page. I'd like to be able to create a new page: $page = new Page; and a comment $comment = new Comment; and attach the comment to the page, without saving any of it $page->comments->associate($comment); I've

问题 Starting from an existing (SQLite) database with foreign keys, can SQLAlchemy automatically build relationships? SQLAlchemy classes are automatically created via __table_args__ = {'autoload': True} . The goal would be to easily access data from related tables without having to add all the relationships one by one by hand (i.e. without using sqlalchemy.orm.relationship() and sqlalchemy.orm.backref ). 回答1: [Update] As of SQLAlchemy 0.9.1 there is Automap extension for doing that. For SQLAlchemy

问题 I'm using backbone.js For example, let's suppose we have a "products" model and a "categories" model which have a many-to-many relationship. In one of my views, say I need to retrieve a list of all categories and know whether or not each one is related to the current product model. Do I set up a "category" collection and have it be a property of my model and somehow give it access to the id of the model so that when it is fetched, it only gets the categories that are related? And then I could

问题 I'm having trouble retrieving matched relationships from a Cypher query. I have this simple trial code: var movie = client.Create(new Movie { Title = "The Matrix" }); client.Create(new Actor { Name = "Keanu Reeves" }, new ActedIn(movie, new ActedInPayload { Role = "Neo" })); client.Create(new Actor { Name = "Hugo Weaving" }, new ActedIn(movie, new ActedInPayload { Role = "Agent Smith" })); var actorsAndRoles = client .Cypher .Start(new { movie = movie }) .Match("actor-[r:ACTED_IN]->movie")

问题 While doing the HTML for my new template, I stumbled across a new meta tag <link rel="profile" href="http://gmpg.org/xfn/11" /> What's this for? I found it linking to this page, and through Google I found this Microformat but I didn't get it. 回答1: In HTML 4.01, there is the profile attribute for the head element: This attribute specifies the location of one or more meta data profiles, separated by white space. For future extensions, user agents should consider the value to be a list even

问题 I'm new to defining relationships and frameworks all together, I'm just used to raw SQL. Did my homework (google + Laravel documentation) but I think I'm just not understanding it properly. Heres is the relevant information: User Table: Table: Users id - int (auto increment) username - varchar Challenges Table: Table: Challenges id - int (auto increment) name - varchar User_challenge_links Table User_challenge_links id - int (auto increment) user_id - int challenge_sub_categories_id - int

问题 My User model has many Target and vice versa. Now I've got a given User and given Target and I want to access pivot data from their relation. The pivot column is called type How can I achieve this? 回答1: On the relationships for both User and Target , tack on a ->withPivot('type') which will instruct Laravel to include that column. Then once you have your result set, you can access the field with $user->pivot->type . If you're not iterating over a collection, but have a user and one of their

问题 In my elastic search server I have one index http://localhost:9200/blog . The (blog) index contains multiple types. e.g.: http://localhost:9200/blog/posts , http://localhost:9200/blog/tags . In the tags type I have created more than 1000 tags and 10 posts created in posts type. e.g.: posts { "_index":"blog", "_type":"posts", "_id":"1", "_version":3, "found":true, "_source" : { "catalogId" : "1", "name" : "cricket", "url" : "http://www.wikipedia/cricket" } } e.g.: tags { "_index":"blog", "

问题 I'm pretty new to Rails, and i'm trying to do a polymorphic HABTM relationship. The problem is that I have three models that I want to relate. The first one is the Event model and then are two kind of attendees: Users and Contacts. What I want to do is to be able to relate as an attendee both users and contacts. So, what i have right now in my code is: Event Model has_and_belongs_to_many :attendees, :polymorphic => true User Model has_and_belongs_to_many :events, :as => :attendees Contact