associations

问题 With Rails 3.1.3 on Ruby 1.9.2 , I have: class User < ActiveRecord::Base has_and_belongs_to_many :states end class State < ActiveRecord::Base has_and_belongs_to_many :users end A User is associated with many State s, and a State with many User s. Given a User , I want to find all other User s who are in any of her states. I tried: class User < ActiveRecord::Base scope :in_state, lambda { |states| joins(:states).where(:states => states) } end User.in_state(current_user.states).all With this

问题 I have the following models role.rb class Role < ActiveRecord::Base attr_accessible :description, :user_id, :role_ids, :permission_ids, :permissions has_many :assignments has_many :users, :through => :assignments has_many :permissions validates :description, presence: true, uniqueness: true end permission.rb class Permission < ActiveRecord::Base attr_accessible :action, :role_id, :subject_class, :subject_id, :role belongs_to :role, :polymorphic => true end My roles_controller.rb is as follows

问题 In my model email token i have def self.token_valid(token, type) return unless token.present? token = EmailToken.where("token = ? and verification_type = ? and confirmed = 'false' and created_at <= ?", token, type, EmailToken.expires).includes(:user).first user = token.user end And I call this method from my controller def confirm_password_reset @user = EmailToken.token_valid(params[:pass_reset],"password") render 'reset_password' if @user end The conditions are valid because I've tested it

问题 Right now if I try to eager load more than two objects deep in phpactiverecord, I get an error. Is something such as this: $conditions['include'] = array( 'playlists' => array('playlist_songs' =>array('song'))); User::find('first', $conditions); Just one level too much to try to retrieve? I'm getting an error Undefined offset: 0 whenever I try to use an association 3 levels deep. Thanks for any help or insight :D. Edit: So I've found a pattern that's a little odd. If I have array('playlist

问题 Association is class Campaign has_many :views_logs has_many :users, through: :views_logs end I want to get all users in a Campaign within any specific dates etc meaning, I want to do something like: Campaign.first.users.where(?) Now, when I query: Campaign.first.users.all I get list of all users within a certain campaign, but how I can I get only those users which have Campaign between specific date ranges only. 回答1: I want to get all users in a Campaign within any specific dates ActiveRecord

问题 I want to get user1 to accept requests from other users to join user1s post as contributors and be listed out if user1 accepts them Can't seem to get it to work - Here's my setup: has_many :through I'm thinking: post model class Post < ActiveRecord::Base #Join table associations has_many :group_requests, class_name: "Group", foreign_key: "requester_id", dependent: :destroy has_many :group_users, class_name: "Group", foreign_key: "accepted_id", dependent: :destroy has_many :requester, through:

问题 I'm using Sails v0.11.2 and MongoDB 3.2 on Mac OS X El Capitan and I'm trying to implement Many-To-Many association using Through option which isn't supported yet. However, googling I found this Waterline Github Issue and elennaro , a github user, gave me a couple of links with some examples: First one Second one I have tried to adapt them to my own Sails app but I can't make it works. I got no errors on the console but the record or document on the intermediary table is not created only the

问题 The code I'm running: <% @organization.events.each do |event| %> <p> <table> <tr> <td> <%= event.name %> </td> <td> <%= event.vips.name %> </td> </tr> </table> </p> <% end %> My associations: class Event < ActiveRecord::Base belongs_to :organization has_many :vips end class Vip < ActiveRecord::Base belongs_to :organization belongs_to :event end class Organization < ActiveRecord::Base belongs_to :user has_many :events has_many :vips end My events table has a vip_id column that is populated

问题 The big picture: I am creating an app to track temporal events historically. I am setting it up with four main models: Users, Events, Stories and Images. The idea is that any given user can create an Event, and add Stories and/or Images to his own Event or to any other one. But both Stories and Images are always attached to a certain Event, and any other model belongs to the User who created it (for filtering and editing purposes) The general structure of the associations would be something

问题 I want to use Association rule in Qlikview to find out the best product combination. But Im not technically strong in QlikView. Can anyone provide tutorials or can kindly teach me how to use the features in qlikview to performed the association rule.(Time slice is flexible if possible. ) And now currently , I'm trying with this tutorial for Market Basket analysis [ http://www.quickqlearqool.nl/?p=965 ] But it did not count the number of customer for the same purchase behaviour . (within 1