Questions tagged [has-many-through]
1523 questions
0
votes
1 answer
Duplicate nested associations returned from json POST
I'm attempting use the REST API in my rails (version 3.2.9) app.
I am POSTing a json packet to a standard rails scaffolded controller, which includes details for the model itself, and nested children.
The parent model and its children are…
Anthony Truskinger
- 628
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1 answer
How to write has_many through two objects (to the same 'destination' object)?
What is the correct way to describe the relationship between a User and the Outcomes of their Questions and Contacts? I want to be able to call User.outcomes and get all outcomes for the user, regardless of whether the outcome was for a question or…
kwh941
- 235
- 2
- 9
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has_many relationship rails 3
Hi I have three tables like the following:
class Workitem < ActiveRecord::Base
has_many :effort
attr_protected
end
class Effort < ActiveRecord::Base
attr_protected
belongs_to :workitem
belongs_to :person
…
anipendakur
- 85
- 10
0
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2 answers
Yii Many To Many To Many?
Let's say I have 3 main tables:
category, tag, url
category and tag have a MANY_MANY relationship.
tag and url have a MANY_MANY relationship.
I would like from category to retrieve all the linked url.
What is the easiest, most efficient way to do…
Nathan H
- 48,033
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1 answer
Associate Model and Update Attribute
I have 2 models with a through relationship:
PortfolioItem
has_many :portfolio_item_images
has_many :images, :through => :portfolio_item_images
PortfolioItemImage
belongs_to :image
belongs_to :portfolio_item
I want to associate a portfolio item…
Zhao Li
- 4,936
- 8
- 33
- 51
0
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1 answer
rails 3 eager load has_many through association with limit
I'm trying to limit a has_many through association for certain instances where I want to limit the number of results when using .includes(:model)
Here's what I have so far:
class Student < ActiveRecord::Base
has_many :courses, :through =>…
agmin
- 8,948
- 2
- 21
- 27
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1 answer
Rails has_many_through form
After a number of hours reading stackoverflow and watching railscasts, I've decided to post. The question is very similar if not identical to many other questions here but I'm just not getting it.
This is my first has_many_through association.
class…
Clay
- 162
- 2
- 9
0
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1 answer
Automatically create associations through many existing associations
I'm working on an engine where any model can have a has_many association with Permit as Permissible:
class Permit < ActiveRecord::Base
belongs_to :permissible, polymorphic: true
end
module Permissible
def self.included(base)
base.class_eval…
iliveinapark
- 327
- 4
- 13
0
votes
1 answer
has_many through association with existing object / ActiveRecord
Given models
class Composition < ActiveRecord::Base
attr_accessible :content
has_many :compositions_tags
has_many :tags, :through => :compositions_tags
end
class Tag < ActiveRecord::Base
attr_accessible :text
has_many…
neilmarion
- 2,372
- 7
- 21
- 36
0
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1 answer
Why does the Rails Guides say has_many :through implements a many-to-many relationship?
To me it appears a nested one-to-many relationship.
Alexander Suraphel
- 10,103
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- 90
0
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1 answer
How can I update has_many :through join model attribute in Rails?
I have a model Group and model User
They are connected both directions with "has_many :through => groups_users"
groups_users table has an attribute, called moderator, specifying whether a user is a moderator of the group
when i am trying to update…
Pavel K.
- 6,697
- 8
- 49
- 80
0
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1 answer
rails: Create does not work with :through in third model
So I have a nested resource with
resources :albums do
resources :elements
end
I can update, delete and view those elements.
What I can not really do is to create a new element.
So it is actually created in the database but not in the mapping…
user1697061
- 255
- 3
- 14
0
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0 answers
How to go through more than one has_many :through?
I need to access an information that is stored 2 relations from the one I'm doing the query on.
class Information < ActiveRecord::Base
...
belongs_to :information_type, polymorphic: true
...
end
class InformationTypeOne < ActiveRecord::Base
…
Cojones
- 2,930
- 4
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- 41
0
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2 answers
rails has_many :through NameError
I have the following setup
class Category < ActiveRecord::Base
has_many :category_products
has_many :products, through: :category_products
end
class Product < ActiveRecord::Base
has_many :category_products
has_many :categories, through:…
Mark Soden
- 81
- 9
0
votes
0 answers
Has_many through mass assignment error
I've read through the many threads on this topic and still can't see why my code won't work. I have the following:
class User < ActiveRecord::Base
has_many :user_roles
has_many :user_groups, :through => :user_roles
#define attributes and…
Paul Whitehouse
- 57
- 6