Questions tagged [has-many-through]
1523 questions
6
votes
2 answers
rails 3 has_many :through record save error
I'm not exactly sure what my problem is, so this question may require some more clarification, but here's what seems to be most relevant:
I have a has_many :through and the join model has some fields that aren't foreign keys. When I build the…
SooDesuNe
- 9,880
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- 91
6
votes
1 answer
Rails 4 collection_check_boxes, with a has_many through
I'm trying to associate categories to products.
The way I've implemented it so far is
Class Product
has_many :categorizations
has_many :categories, through: :categorizations
.
Class Categorization
belongs_to :product
belongs_to…
JacobJuul
- 152
- 1
- 12
6
votes
1 answer
How can one obtain a row count from has_many :through relations with :uniq => true
This is my model:
class Tag < ActiveRecord::Base
# id, name
has_many :taggings
end
class Tagging < ActiveRecord::Base
# id, tag_id, owner_id, target_type, target_id
belongs_to :tag
belongs_to :owner, :class_name => 'User'
belongs_to…
Noel Walters
- 1,843
- 1
- 14
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6
votes
2 answers
Specifying the foreign key in a has_many :through relationship
I have the following three models: User, Project, and Assignment.
A User has_many Projects through an assignment. However, Assignment actually has two foreign keys that relate to a User: user_id (representing the user who was assigned the project)…
jakeboxer
- 3,300
- 4
- 26
- 27
6
votes
1 answer
has_many :through questions
I was previously using has_and_belongs_to_many, and have converted to has_many :through. Here's how it looks for a list of games that can have many users playing. With this, I can do game.users and user.games....:
class Game < ActiveRecord::Base
…
cmaughan
- 2,596
- 5
- 30
- 35
6
votes
1 answer
Rails model with two polymorphic has_many through: associations for object tagging
My schema has Articles and Journals that can be tagged with Tags. This requires a has_many through: association with a polymorphic relationship to my Tagging join table.
Okay, that's the easy and well documented part.
My problem is that Articles can…
djoll
- 1,139
- 1
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- 31
6
votes
1 answer
Editing many-to-many relations in Activeadmin
I am looking for a way to edit/add keywords related to an article, inline in Activeadmin.
I have defined a simple many-to-many setup:
class Area < ActiveRecord::Base
has_many :area_keywords
has_many :keywords, :through => :area_keywords
…
Martin Poulsen
- 422
- 4
- 13
6
votes
4 answers
Rails nested attributes - how to add category attribute to new product?
I'm using rails to create a new product and want to add a category to every product.
I have three tables: product, category, and categorizations (which stores the relationship between products and categories). I'm trying to use nested attributes to…
william tell
- 4,352
- 6
- 23
- 27
5
votes
1 answer
Rails 3.2 - accepts_nested_attributes_for and join models
I have the following models: user, role, user_role (user_role is a join model)
I am trying to edit a user's roles using checkboxes on the user#edit page. Here's my attempt, I feel like I'm missing something significant, or taking the wrong…
ardavis
- 9,842
- 12
- 58
- 112
5
votes
1 answer
Why is my has_many through associated record (sometimes) readonly?
I have three ActiveRecord models: Partner, MembershipChannel (which is an STI model, inheriting from Channel) and ChannelMembership (I was not responsible for naming these models…)
When I load a ChannelMembership through the Partner association, I…
Martin Svalin
- 2,227
- 1
- 17
- 23
5
votes
4 answers
Saving join attributes through a has_many :through with :conditions
I have an Artist model that looks like this:
# app/models/artist.rb
class Artist < ActiveRecord::Base
# Relationships
has_many :releases
has_many :songs, :through => :releases
has_many :featured_songs, :through => :releases,
…
Mario Zigliotto
- 8,315
- 7
- 52
- 71
5
votes
2 answers
Rails has_many :through with custom foreign_key
I have the following set of models:
class Cardstock < ActiveRecord::Base
has_many :color_matches, :primary_key => :hex, :foreign_key => :hex
has_many :palette_colors, :through => :color_matches
end
class ColorMatch < ActiveRecord::Base
…
Alex Kahn
- 537
- 5
- 10
5
votes
1 answer
Rails custom ActiveRecord::Type fails when using `class_name` in has_many :through association
I'm using KSUIDs as a replacement for UUIDs in my Rails app. michaelherold/ksuid-ruby ported KSUIDs to Ruby and implemented them as ::ActiveRecord::Type::String. Everything is working great except one little bug when using has_many :through…
mattes
- 8,936
- 5
- 48
- 73
5
votes
1 answer
Creating or updating association with has_many :through
Say I have two models, Director and Movie, and a third join model called Directions. They are defined as such:
Movie:
class Movie < ActiveRecord::Base
has_many :directions
has_many :directors, :through => :directions
end
Director:
class…
Erlingur Þorsteinsson
- 86
- 1
- 4
5
votes
2 answers
activerecord find through association
I am trying to retrieve an activerecord object from my db. My models are
class User < ActiveRecord::Base
belongs_to :account
has_many :domains, :through => :account
end
And
class Account < ActiveRecord::Base
has_many :domains
…
Dimitris
- 2,501
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