Question

在查看用户的“显示”页面时，我想显示用户所在的团队，然后显示每个团队的成员数量。我试图了解如何在模型中编写方法来实现此功能。

class Membership < ActiveRecord::Base
  attr_accessible :team_id, :user_id
  belongs_to :team
  belongs_to :user
end

class Team < ActiveRecord::Base
  attr_accessible :name, :user_id
  belongs_to :admin, :class_name => "User",:foreign_key => "user_id"
  has_many :memberships
  has_many :members, through: :memberships, source: :user
  has_many :users, through: :memberships
end

class User < ActiveRecord::Base
  belongs_to :team
  has_many :teams, through: :memberships
  has_many :memberships
end

ActiveRecord::Schema.define(:version => 20140211214838) do


create_table "memberships", :force => true do |t|
  t.integer "team_id"
  t.integer "user_id"
  t.datetime "created_at", :null => false
  t.datetime "updated_at", :null => false
end


create_table "teams", :force => true do |t|
  t.string "name"
  t.integer "user_id"
  t.datetime "created_at", :null => false
  t.datetime "updated_at", :null => false
end

create_table "users", :force => true do |t|
  t.string "email", :default => "", :null => false
  t.string "encrypted_password", :default => "", :null => false
  t.string "reset_password_token"
  t.datetime "reset_password_sent_at"
  t.datetime "remember_created_at"
  t.integer "sign_in_count", :default => 0, :null => false
  t.datetime "current_sign_in_at"
  t.datetime "last_sign_in_at"
  t.string "current_sign_in_ip"
  t.string "last_sign_in_ip"
  t.string "image_file_name"
  t.string "image_content_type"
  t.integer "image_file_size"
  t.datetime "image_updated_at"
  t.datetime "created_at", :null => false
  t.datetime "updated_at", :null => false
  t.string "username"
  t.string "bio"
  t.string "location"
end

end

Answer 1

您已经建立了关联，您只需要在视图中迭代团队。例如：

# users/show.html.erb
...
<% @user.teams.each do |team| %>
 <div><%= "#{team.name} (#{team.members.count})" %></div>
<% end %>
...

根据您对团队和成员数据的其他操作，出于性能原因，eager load与用户的某些关联可能是个好主意。

如何为团队功能创建活动记录关联

1 个答案: