has-one

Method for defining simultaneous has-many and has-one associations between two models in CakePHP?

由 时光总嘲笑我的痴心妄想 提交于 2019-12-11 10:45:29
问题 One thing with which I have long had problems, within the CakePHP framework, is defining simultaneous hasOne and hasMany relationships between two models. For example: BlogEntry hasMany Comment BlogEntry hasOne MostRecentComment (where MostRecentComment is the Comment with the most recent created field) Defining these relationships in the BlogEntry model properties is problematic. CakePHP's ORM implements a has-one relationship as an INNER JOIN , so as soon as there is more than one Comment,

belongs_to has_one structure

由 血红的双手。 提交于 2019-12-11 06:29:34
问题 I have an application which has the following characteristics There are Clubs Each Club has Teams Each Team has Players I have a users table. The user table basically contains the username and password for the club manager, team manager and the player to login to the system. How should I structure the models and the tables? I plan to create tables for Club, Team and Players. But I am not sure show to structure the relationship between them and the users table. I could create user_id in each

Rails 3, comments in a nested form, wrong routes?

由 北城以北 提交于 2019-12-11 04:47:12
问题 I have a Posts model, which has many posts in many languages . It's a bit non-standard, but to illustrate: class Post < ActiveRecord::Base has_one :eng_post, :dependent => :destroy # <-- HAS_ONE! accepts_nested_attributes_for :eng_post, :allow_destroy => true end I.e. a Post has one EngPost. Whereas EngPost is defined in the model as: class EngPost < ActiveRecord::Base belongs_to :post has_many :eng_comments, :dependent => :destroy accepts_nested_attributes_for :eng_comments, :allow_destroy =

has_one :through => multiple

由 走远了吗. 提交于 2019-12-10 18:17:26
问题 Both Attendment & Vouching: belongs_to :event belongs_to :account Therefore: 1 to 1 relationship between attendments and vouchings. Is there a way to do this without my thinking too much? # attendment has_one :vouching :through => [:event, :account] Note: I don't mind thinking too much, actually. 回答1: Yeah i don't think you can use a has_one for this. Assuming I'm reading this correctly, you have two models: Attendment Vouching They both store an event_id and account_id. You want to know from

Weird relationship behavior on Rails 3 and update_attribute

由 六眼飞鱼酱① 提交于 2019-12-08 03:22:10
问题 I'm having a hard time trying to find out why a test is failing: describe User, "Instance Methods" do describe "leave_group!" do it "should set group_id to nil" do @user = Factory(:user) @group_2 = Factory(:group, :owner => @user) @user.leave_group! @user.reload.group_id.should be_nil # THIS LINE IS FAILING!!! end it "should assign another owner to group, if owner was user" do @user = Factory(:user) @group = Factory(:group, :owner => @user) 1.upto(4) { @group.add_user Factory(:user) } @user

Weird relationship behavior on Rails 3 and update_attribute

由 我是研究僧i 提交于 2019-12-06 15:58:22
I'm having a hard time trying to find out why a test is failing: describe User, "Instance Methods" do describe "leave_group!" do it "should set group_id to nil" do @user = Factory(:user) @group_2 = Factory(:group, :owner => @user) @user.leave_group! @user.reload.group_id.should be_nil # THIS LINE IS FAILING!!! end it "should assign another owner to group, if owner was user" do @user = Factory(:user) @group = Factory(:group, :owner => @user) 1.upto(4) { @group.add_user Factory(:user) } @user.leave_group! @group.reload.owner.should_not eql(@user) end end end These are the models I'm using: class

CakePHP hasOne/belongsTo model relationship

由 夙愿已清 提交于 2019-12-06 05:37:07
问题 I have a few models I'm trying to relate. One model is Item , one is Slide , and another is Asset . Items have multiple slides beneath them. Assets are basically files that have been uploaded (images, mp3s, etc) and slides are where assets are displayed. Each slide has one asset, but a given asset might belong to multiple slides. A slide has an asset_id field defined. I currently have the models defined as: Slide class Slide extends AppModel { var $name = 'Slide'; var $order = array("Slide

hasMany reduced to hasOne in CakePHP

由 …衆ロ難τιáo~ 提交于 2019-12-06 04:29:14
Basically I have following models in CakePHP: User(id, username) Photo(id, user_id, path) I have set up following relation: User hasMany Photo. On one screen, I would like to list users, and show random photo next to each user. I tried setting up following relation: User hasOne SamplePhoto (where SamplePhoto is just Photo model) but when user has two photos for instance, he is listed twice on the list. basically my question is: can you reduce hasMany relation to hasOne, without adding any fields to table schema presented above? I would like to tell cake - find the first record in the Photo

How do you override the getter method for a Rails has_one association?

由 巧了我就是萌 提交于 2019-12-06 01:39:07
问题 I want to override/extend a Rails has_one association method so that it always returns an instance of the associated class. (If none already exists in the database, I want to create a new one and assign it to the parent instance.) Ideally, I'd like to do this through the built-in Rails association extension mechanism. However, I don't know the name of the "getter" method, and so I don't know what to override. How do I override the association getter so that I can instantiate a new object when

Can has_one association be used when the model has one or zero instances of another model?

由 耗尽温柔 提交于 2019-12-04 18:17:29
问题 RailsGuides says: http://guides.rubyonrails.org/association_basics.html A has_many "association indicates that each instance of the model has zero or more instances of another model." "A has_one association also sets up a one-to-one connection with another model, but with somewhat different semantics (and consequences). This association indicates that each instance of a model contains or possesses one instance of another model." Does that mean if I want to set up an association that each
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