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Questions tagged [has-many-through]

1523 questions
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How can I use accepts_nested_attributes_for to create > 1 related object in a join table?

I have a very simple design at present, created using Ruby 2.0 and the Rails 4 beta. I have users, and groups. A User can be a member of multiple groups, and a Group can have multiple users as members. I thus have a join model, UserGroup, which only…
Carr0t
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How to create a nested form for a has_many through association using simple_form and nested form?

I have a rails app that has an album and song model with a has many through relationship. I'm trying to add songs to albums using the simple_form and nested_form gems. If I use simple_form, it's easy to create the association, but I'm having trouble…
Lee McAlilly
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Does has_many association attribute setter always persist its value to a database and is it possible to make it not to?

I have the following script which demonstrates me that has_many roles= attribute always works in a persistent manner. My questions are: 1) What is the reason behind this behavior: why has_many attributes are persisted right at the moment when…
Stanislav Pankevich
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Rails: nesting same resource in multiple nested restful routes?

This is pretty easy but switching back n' forth between frameworks/languages has me doubting myself. Trying to work out routes for has_many :through relationship in Rails. #User has_many :reservations, :dependent => :destroy has_many :events,…
Meltemi
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Rails 3, many-to-many form using accepts_nested_attributes_for, how do I set up correctly?

I have a many-to-many relationship between Recipes and Ingredients. I am trying to build a form that allows me to add an ingredient to a recipe. (Variants of this question have been asked repeatedly, I have spent hours on this, but am fundamentally…
Tom Harrison
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rails 3 has_many through has_one

Suppose you have the following models: class Category < ActiveRecord::Base has_one :current_heat, class_name: 'Heat' has_many :scores, :through => :current_heat end class Heat < ActiveRecord::Base belongs_to :category has_many…
mgadda
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Rails has_many through with condition, build new

I've got users and organisations with a join model UsersOrganisation. Users may be admins of Organisations - if so the is_admin boolean is true. If I set the is_admin boolean by hand in the database, Organisations.admins works as I'd expect. In the…
Edward
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Good name for a has_many through association

I've read about many to many relationship in rails 3 and saw that HABTM has been "deprecated", as in one should use has_many :through most of the time. I saw plenty of examples where the Join Model has a clear name, for example Magazine, Suscriber =…
Pontek
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Adding attribute values to a join table record in a has_many :through association upon creation

I am setting up a has_many :through relationship on my Rails 3.2 app. I have most everything working, except that I'm not sure how to add values to attributes on the join table when relationships are created. Here are the models (notice the…
Randy Burgess
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Nested :has_many, :through attributes

I am using a has_many :through to create an association between two models using a pass-through called  list_items : user.rb: has_many :list_items has_many :wishes, :through => :list_items wishe.rb: has_many :list_items has_many :users,…
Jayson Lane
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has_many :through query with both values

Let's say I have: class Post has_many :tags, :through => :taggings has_many :taggings end Notice there's no :include. Now say I want to retrieve all taggings and tags in the same query. How could I do that? I'm looking for something…
mahemoff
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acts_as_tree and has_many :through not working well together

I have the following: class Menu < ActiveRecord::Base has_many :menu_headers # has_many :menu_headers, :conditions => {:parent_id => 0} - was trying # to set parent_id to 0 for top level has_many :menu_items, :through =>…
timpone
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Rails / Active Record has_many through association - fetching a record

I have a has_many relationship of models Role and Access through model Permission. I have a situation that no two roles should have identical accesses. So, I created a custom validation which basically results in an error message when current…
prasvin
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Duplicate records when using update_attributes() and a has_many :through association

I can't figure out why it's generating duplicate recruit_profiles_skills instead of updating. class RecruitProfile < ActiveRecord::Base has_many :skills, :through => :recruit_profiles_skills has_many :recruit_profiles_skills, :dependent =>…
hrdwdmrbl
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How do I set a join model's attribute on the fly when creating a relationship?

I have a has_many :through relationship between users and projects via an ownership join model. I want to be able to set an attribute of the ownership model while creating a relationship between a user and a new project. Here is what I have so…
Matthew Berman
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