has-many-through | 易学教程

Need data from rails join table, has_many :through

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I have 3 tables - users, things, and follows. Users can follow things through the follows table, associating a user_id with a things_id . This would mean: class User has_many :things, :through => :follows end class Thing has_many :users, :through => :follows end class Follow belongs_to :users belongs_to :things end So I can retrieve thing.users with no problem. My issue is if in the follows table, I have a column named "relation", so I can set a follower as an "admin", I want to have access to that relation. So in a loop I can do something like: <% things.users.each do |user| %> <%= user

Rails - Sort by join table data

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I've got a RoR project in the works. Here are the applicable sections of my models. Home has_many :communities, :through => :availabilities has_many :availabilities, :order => "price ASC" Community has_many :homes, :through => :availabilities has_many :availabilities Availability belongs_to :home belongs_to :community The "availabilities" table in the database has the additional data column "price" So now I can call @home.availabilities.each do |a| a.community.name a.price and get back the availabilities data ordered by price as I want. My question is this: Is there a way to automatically

How to set up factory in FactoryGirl with has_many association

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问题 Can someone tell me if I'm just going about the setup the wrong way? I have the following models that have has_many.through associations: class Listing < ActiveRecord::Base attr_accessible ... has_many :listing_features has_many :features, :through => :listing_features validates_presence_of ... ... end class Feature < ActiveRecord::Base attr_accessible ... validates_presence_of ... validates_uniqueness_of ... has_many :listing_features has_many :listings, :through => :listing_features end

Rails has_many :through nested form

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I have just jumped into has_many :through association. I'm trying to implement the ability to save data for all 3 tables ( Physician , Patient and association table) through a single form. My migrations: class CreatePhysicians < ActiveRecord::Migration def self.up create_table :physicians do |t| t.string :name t.timestamps end end end class CreatePatients < ActiveRecord::Migration def self.up create_table :patients do |t| t.string :name t.timestamps end end end class CreateAppointments < ActiveRecord::Migration def self.up create_table :appointments do |t| t.integer :physician_id t.integer

How to Implement a Friendship Model in Rails 3 for a Social Networking Application?

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I'm currently working on a small social networking application and right now I'm trying to create a model that represents friendships between users . This is what I came up with so far: class User < ActiveRecord::Base # ... has_many :friendships has_many :friends, :through => :friendships end class Friendship < ActiveRecord::Base belongs_to :user belongs_to :friend, :class_name => 'User' end My friendship model has a field confirmed as boolean which I'd like to use to define a friendship as pending or confirmed. How can I access all pending request for a certain user? Can I somehow define this

has_many through additional attributes

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问题 How do we set additional parameters in has_many through associations? Thanks. Neelesh 回答1: This blog post has the perfect solution: http://www.tweetegy.com/2011/02/setting-join-table-attribute-has_many-through-association-in-rails-activerecord/ That solution is: create your ":through model" manually, rather than through the automated way when you append to its owner's array. Using the example from that blog post. Where your models are: class Product < ActiveRecord::Base has_many

How do I order a has_many through association in Ruby on Rails?

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问题 Given the following AR models, I would like to sort users alphabetically by last name when given a handle to a task: #user has_many :assignments has_many :tasks, :through => :assignments #assignment belongs_to :task belongs_to :user #task has_many :assignments has_many :users, :through => :assignments I would like to get a task then navigation to its assigned users, and sort the user list alphabetically . I keep thinking that I should be able to add the :order clause to has_many :users,

Rails 4 Form: has_many through: checkboxes

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问题 Original question Two resources: users and animals. When creating a user, the client selects check boxes to say how many animals they have. When the user form is submitted, it should not only create a new user record, but it should also create a bunch of records in the animal_users rich join table to represent each of the check boxes the client selected. The issue I think is that I am not specifying something correctly for the checkbox part within the form. I have looked at the checkbox_tag

Rails 3, nested multi-level forms and has_many through

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问题 I'm trying to get it to work but it dosen't! I have class User < ActiveRecord::Base has_many :events, :through => :event_users has_many :event_users accepts_nested_attributes_for :event_users end class Event < ActiveRecord::Base has_many :event_users has_many :users, :through => :event_users accepts_nested_attributes_for :users end class EventUser < ActiveRecord::Base set_table_name :events_users belongs_to :event belongs_to :user accepts_nested_attributes_for :events accepts_nested

Rails has_many through form with checkboxes and extra field in the join model

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I'm trying to solve a pretty common (as I thought) task. There're three models: class Product < ActiveRecord::Base validates :name, presence: true has_many :categorizations has_many :categories, :through => :categorizations accepts_nested_attributes_for :categorizations end class Categorization < ActiveRecord::Base belongs_to :product belongs_to :category validates :description, presence: true # note the additional field here end class Category < ActiveRecord::Base validates :name, presence: true end My problems begin when it comes to Product new/edit form. When creating a product I need to