I have been experiencing problems when trying to destroy_all my users in my database. When I run User.destroy_all I get:
ActiveRecord::HasManyThroughCantAssociateThroughHasOneOrManyReflection: Cannot modify association 'Account#hotel_partnerships' because the source reflection class 'Partnership' is associated to 'Hotel' via :has_many.
I suspect that the main problem is that in my schema I have an accountmodel that belongs_to a user(the owner of the account) and at the same time the account has_many users through its offices and hotels.
Here's how my associations look like :
- Account.rb
class Account < ActiveRecord::Base
# associations
has_many :hotel_partnerships, through: :hotels, source: :partnerships, dependent: :destroy
has_many :office_partnerships, through: :offices, source: :partnerships, dependent: :destroy
has_many :hotel_users, through: :hotels,source: :users, dependent: :destroy
has_many :office_users, through: :offices, source: :users, dependent: :destroy
has_many :hotels, dependent: :destroy
has_many :offices, dependent: :destroy
has_many :rooms, through: :hotels, dependent: :destroy
has_many :tasks, through: :hotels, dependent: :destroy
belongs_to :admin, class_name: "User", foreign_key: "admin_user_id", dependent: :destroy
- User.rb
class User < ActiveRecord::Base
## this line adds auth token to all user on creation
acts_as_token_authenticatable
# associations
belongs_to :account, dependent: :destroy
has_and_belongs_to_many :hotels
has_and_belongs_to_many :offices
has_many :tasks, dependent: :destroy
has_many :bookings, dependent: :destroy
has_one :created_account, class_name: "Account", foreign_key: "admin_user_id", inverse_of: :admin, dependent: :destroy
- Partnership.rb
class Partnership < ActiveRecord::Base
belongs_to :hotel
belongs_to :office
- Hotel.rb
class Hotel < ActiveRecord::Base
geocoded_by :full_address
after_validation :geocode
has_many :partnerships
belongs_to :account
has_and_belongs_to_many :users
has_many :tasks, dependent: :destroy
has_many :rooms, dependent: :destroy
has_many :beds, through: :rooms, dependent: :destroy
has_many :photos, dependent: :destroy
accepts_nested_attributes_for :photos
accepts_nested_attributes_for :rooms
Is it possible to fix this circular association problem ?
In my Rails 4 app, I have the following models:
User
has_many :administrations
has_many :calendars, through: :administrations
has_many :comments
has_many :calendar_comments, through: :calendars, :source => :comments
Calendar
has_many :administrations
has_many :users, through: :administrations
has_many :posts
has_many :comments, through: posts
has_many :ads
Administration
belongs_to :user
belongs_to :calendar
Post
belongs_to :calendar
has_many :comments, as: :commentable
Ad
belongs_to :calendar
has_many :comments, as: :commentable
Comment
belongs_to :commentable, polymorphic: true
belongs_to :user
I need to access the comments that belong_to an ad from the calendar the ad belongs_to.
This is what I am trying to do in my Calendars#Index action:
#posts_comments = #user.calendar_comments.where(commentable_type: "Post").order("created_at DESC").limit(5)
#ads_comments = #user.calendar_comments.where(commentable_type: "Ad").order("created_at DESC").limit(5)
My first guess was to add has_many :comments, through: ads in the Calendar model:
Calendar
has_many :administrations
has_many :users, through: :administrations
has_many :posts
has_many :comments, through: posts
has_many : ads
has_many :comments, through: ads
But that cancels the effect of has_many :comments, through: posts and then I can no longer access the comments that belong_to an post from the calendar the post belongs_to.
Is there a way to make BOTH has_many :comments, through: posts AND has_many :comments, through: ads work?
—————
UPDATE: according to this article and that Stack Overflow question, the answer may lay in the use of source: and source_type:.
Not sure how to use those however.
—————
UPDATE 2: would the following code make any sense?
class Calendar < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :users, through: :administrations
has_many :posts, dependent: :destroy
has_many :commented_posts, through: :comments, source: :commentable, source_type: 'Post'
has_many :ads, dependent: :destroy
has_many :commented_ads, through: :comments, source: :commentable, source_type: 'Ad'
—————
UPDATE 3: when I try the above code, I get the following error message:
Could not find the source association(s) :comments in model Calendar. Try 'has_many :calendar_comments, :through => :calendars, :source => <name>'. Is it one of administrations, users, posts, commented_posts, ads, commented_ads, invites, or pokes?
I tried the following:
class Calendar < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :users, through: :administrations
has_many :posts, dependent: :destroy
has_many :calendar_comments, :through => :calendars, :source => :post
has_many :ads, dependent: :destroy
has_many :calendar_comments, :through => :calendars, :source => :ad
—————
UPDATE 4: a new failed attempt with the following code:
class Calendar < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :users, through: :administrations
has_many :posts, dependent: :destroy
has_many :calendar_comments, :through => :commentable, :source => :post
has_many :ads, dependent: :destroy
has_many :calendar_comments, :through => :commentable, :source => :ad
Still not working, same error message as above.
—————
UPDATE 5: based on MrYoshiji's answer, I now have
class Calendar < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :users, through: :administrations
has_many :posts, dependent: :destroy
has_many :posts_comments, through: :posts, source_type: 'Post'
has_many :ads, dependent: :destroy
has_many :ads_comments, through: :ads, source_type: 'Ad'
Now, has_many :calendar_comments, through: :calendars, :source => :comments in the User model is no longer working.
I tried:
has_many :comments
has_many :calendar_post_comments, through: :calendars, :source => :post_comments
has_many :calendar_ad_comments, through: :calendars, :source => :ad_comments
Still not working.
—————
UPDATE 6: I am still stuck with this issue, since I cannot figure out a way to get the following code working:
#posts_comments = #user.calendar_comments.where(commentable_type: "Post").order("created_at DESC").limit(5)
#ads_comments = #user.calendar_comments.where(commentable_type: "Ad").order("created_at DESC").limit(5)
I tried many different things, and the best I could come up with so far was:
class Calendar < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :users, through: :administrations
has_many :posts, dependent: :destroy
has_many :post_comments, through: :posts, source_type: 'Post'
has_many :ads, dependent: :destroy
has_many :ad_comments, through: :ads, source_type: 'Ad'
end
class User < ActiveRecord::Base
has_many :administrations, dependent: :destroy
has_many :calendars, through: :administrations
has_many :comments
has_many :calendar_post_comments, through: :calendars, :source => :post_comments
has_many :calendar_ad_comments, through: :calendars, :source => :ad_comments
end
Then, I update my Calendars controller as follows:
def index
#user = current_user
#calendars = #user.calendars.all
#posts_comments = #user.calendar_post_comments
.order("created_at DESC")
.limit(5)
#ads_comments = #user.calendar_ad.comments
.order("created_at DESC")
.limit(5)
end
But this returns the following error:
NoMethodError at /calendars
undefined method `chain' for nil:NilClass
#posts_comments = #user.calendar_post_comments.order("created_at DESC").limit(5)
What is wrong here?
You should try the following:
class Calendar < ActiveRecord::Base
# [ ... ]
has_many :posts
has_many :posts_comments, through: posts, source_type: 'Post'
has_many :ads
has_many :ads_comments, through: ads, source_type: 'Ad'
Considering that Ad and Post models both have the following:
has_many :comments, as: :commentable
Run.rb:
has_many :schedule_machines, through: :schedule_locations
Schedule.rb:
has_many :schedule_locations, dependent: :destroy
has_many :schedule_machines, through: :schedule_locations
has_many :assigned_schedule_machines, through: :runs, source: :schedule_machines
has_many :runs, dependent: :destroy
when I look at a Schedule in the console,
schedule.assigned_schedule_machines
gives an undefined method.
How come?
has_many :runs, dependent: :destroy
has_many :assigned_schedule_machines, through: :runs, source: :schedule_machines
You need to order the "runs" first. The assigned_schedule wants to use runs; but in your original code the runs wasn't defined yet.
I have three models: Almon, Bela and Lingo
class Almon < ActiveRecord::Base
belongs_to :bela, dependent: :destroy
has_many :lingos, through: :bela, dependent: :delete_all
accepts_nested_attributes_for :bela
accepts_nested_attributes_for :lingos, :allow_destroy => true
end
I am trying to submit a nested form in Almon and I am getting
Cannot modify association 'Almon#Lingos' because the source reflection class 'Lingo' is associated to 'Bela' via :has_many.
Could anyone please tell me what I am doing wrong?
You need to use has_many instead of belongs_to as the following:
has_many :belaes, dependent: :destroy
has_many :lingoes, through: :belaes, dependent: :delete_all
I'm not sure what has changed getting this error when trying to login:
ERROR: relation "tags" does not exist
LINE 1: SELECT DISTINCT "tags".* FROM "tags" INNER JOIN "taggings" O...
The tag model:
class Tag < ActiveRecord::Base
attr_accessor :unread_count, :user_feeds
has_many :taggings
has_many :feeds, through: :taggings
end
The tagging model:
class Tagging < ActiveRecord::Base
belongs_to :tag
belongs_to :feed
belongs_to :user
end
And the user relationships:
class User < ActiveRecord::Base
has_one :coupon
has_many :subscriptions, dependent: :delete_all
has_many :feeds, through: :subscriptions
has_many :entries, through: :feeds
has_many :imports, dependent: :destroy
has_many :billing_events, as: :billable, dependent: :delete_all
has_many :taggings, dependent: :delete_all
has_many :tags, through: :taggings
has_many :sharing_services, dependent: :delete_all
has_many :unread_entries, dependent: :delete_all
has_many :starred_entries, dependent: :delete_all
has_many :saved_searches, dependent: :delete_all
has_many :actions, dependent: :destroy
belongs_to :plan
end
This error is new and came right after I tried to install the intercom.io gem. I removed the gem, did a gem cleanup, reset the db and still the same error.
Not sure what happened, if anyone has any suggestions I would appreciate it.
Checked missing tables, and that was the problem.