has-many

I have users which have products through a habtm link, which is working. I want to add a link between the user model and the product model, to keep track of the creator of that product (who doesn't always own the product, of course) But when I write in my user and product models a new link, the application screws up because I can't distinguish the creator of a product from the owner of (a lot of) products . Can you help me ? Here is my models : class Product < ActiveRecord::Base belongs_to :group has_and_belongs_to_many :authors has_and_belongs_to_many :users # THIS IS OK (with appart table)

I have domain like this: class Team { hasOne [leader: Person] hasMany [member: Person] } class Person { belongsTo [team: Team] } But when the tables are generated, there is not a column like leader_id in the team table. And thus the leader relation is not persisted. How should I fix it? Shaoxuan I figured that, what I need is class Team { belongsTo [leader: Person] hasMany [member: Person] } class Person { belongsTo [team: Team] } so that the Team table can have the desired "leader" reference back to Person. Per the documentation : Use a hasOne association to store the foreign key reference in

I have a database with 6500 players and each player has an average of 15 game results . Use case I want to generate a list of players, ordered by the sum of their prize money (a field in the results table). I prefer this to be in some sort of scope, so I can also filter the list on the player's country, etc. Performance I have seen posts that mention a cache_counter field for performance. In my case I have thousands of result records (75.000+) so I don't want the calculations being done every time someone visits the generated listings. Question What is the best pattern to solve this? And how

An event has many participants. A participant has a field of "status". class Event < ActiveRecord::Base has_many :participants end class Participant < ActiveRecord::Base belongs_to :event end I need to find all events except the following ones: events where every one of its participants has a status of 'present'. I can find all events where some of its participants have a status of 'present' with the following AR code: Event.joins(:participants).where .not(participants: {status: 'present'}) .select("events.id, count(*)") .group("participants.event_id") .having("count(*) > 0") That creates SQL

I've got three (relevant) models, specified like this: class User < ActiveRecord::Base has_many :posts has_many :comments has_many :comments_received, :through => :posts, :source => :comments end class Post < ActiveRecord::Base belongs_to :user has_many :comments end class Comment < ActiveRecord::Base belongs_to :user belongs_to :post end I'd like to be able to reference all the comments_received for a user with a route - let's say it's for batch approval of comments on all posts. (note that you can also get comments made by the user , but users can't comment on their own posts, so the

I have the following line in my ActiveRecord model: class Record < ActiveRecord::Base has_many :users, :through => :record_users, :uniq => true, :order => "record_users.index ASC" This is intended to enable me to read out record.users in a way that I order using an index field in the record_users model. The problem is that this fails on PostgreSQL with the following error: ActionView::TemplateError (PGError: ERROR: for SELECT DISTINCT, ORDER BY expressions must appear in select list Is there a way to fix the statement to make it work? Casper Fabricius I suppose you could call it a bug in

I have two models, Complaint and Company. Complaint belongs_to and accepts_nested_attributes for Company, and Company has_many Complaints. # Models class Complaint < ActiveRecord::Base attr_accessible :complaint, :date, :resolved belongs_to :user, :class_name => 'User', :foreign_key => 'id' belongs_to :company, :class_name => 'Company', :foreign_key => 'id' has_many :replies accepts_nested_attributes_for :company end class Company < ActiveRecord::Base attr_accessible :name has_many :complaints, :class_name => 'Complaint', :foreign_key => 'id' has_many :branches, :class_name => 'Branch',

I'm not sure if my question is worded correctly. I have three models: User , Item , and UserItem . user has_many :user_items user has_many :items, through :user_items item has_many :user_items item has_many :users -> {uniq}, through :user_items item belongs_to :user user_item belongs_to :user user_item belongs_to :item I need a way to see if a user has an item to make if statements in my item views But here's the catch, user_items have enum status: [ :pending, approved] . So I need to see if a current_user has a certain :pending item. For example when a user visits item1's view page I have the