how to find records from another table in rails?

Question

I have welcome,user,college,education model.. On the welcome page i want to show messages posted by only those users who have gone to the same college as the current user...but i am not able to show that. i have written following code in my welcome controller :

def index
  @welcome = Welcome.all
  @newmessage = Welcome.new
  @college = User.find(@current_user.id).colleges
end

using first line i am able to show messages posted by all users inside my view but that is not what i want.Using third line i am able to find current users college data but i am not sure how can i use this data...

how can i search only those users having tha same college as current users...

Following is the model codes :

---

class User < ActiveRecord::Base
    has_many :welcomes
    has_many :educations
    has_many :colleges, :through => :educations 
end

class College < ActiveRecord::Base
    has_many :educations
    has_many :users, :through => :educations
end

class Welcome < ActiveRecord::Base
    belongs_to :user
end

Following is my schema code for these models :

create_table "welcomes", :force => true do |t|
    t.text     "message"
    t.integer  "user_id"
    t.datetime "created_at"
    t.datetime "updated_at"
  end

create_table "users", :force => true do |t|
    t.string   "email",                                 :default => "", :null => false
    t.string   "encrypted_password",     :limit => 128, :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
    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.datetime "created_at"
    t.datetime "updated_at"
    t.string   "first_name"
    t.string   "last_name"
    t.integer  "role_id"
    t.string   "ancestry"
  end
create_table "educations", :force => true do |t|
    t.integer  "college_id"
    t.integer  "user_id"
    t.integer  "year"
    t.text     "concentration"
    t.string   "attended_for"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.string   "month"
    t.boolean  "private",         :default => false
    t.boolean  "approved",        :default => false
    t.integer  "approved_by"
    t.boolean  "alumni",          :default => false
    t.boolean  "is_mentor",       :default => false
    t.boolean  "approved_mentor", :default => false
  end

create_table "colleges", :force => true do |t|
    t.string   "name"
    t.datetime "created_at"
    t.datetime "updated_at"
    t.boolean  "approved",   :default => false
  end

Answer 1

看看这是否有帮助-

User.find(@current_user.id).colleges.joins(:users => :welcomes).select('welcomes.message')