Rails 4 has_many :through accessing field on join table -

i have 3 models:

class user < activerecord::base   has_many :user_leave_portfolios   has_many :leave_portfolios, :through => :user_leave_portfolios end  class leaveportfolio < activerecord::base   has_many :user_leave_portfolios, dependent: :destroy   has_many :users, :through => :user_leave_portfolios end  class userleaveportfolio < activerecord::base   belongs_to :user   belongs_to :leave_portfolio    # table has additional field named 'leave_amount' end 

the 'leave_amount' field on user_leave_portfolio table used user chosen leave amount based on leave_portfolio

according documentation , various other blogs , articles, should able access 'leave amount' field with:

u = user.first u.leave_portfolios.first.leave_amount 

however, following error:

nomethoderror: undefined method `leave_amount' #leaveportfolio:0x007f8708e3dbe0

schema:

create_table "leave_portfolios", force: :cascade |t|   t.string   "name",             limit: 255   t.integer  "calculation_type", limit: 4   t.integer  "period",           limit: 4   t.integer  "default_amount",   limit: 4   t.integer  "organisation_id",  limit: 4   t.datetime "created_at",                   null: false   t.datetime "updated_at",                   null: false end  create_table "user_leave_portfolios", force: :cascade |t|   t.integer  "leave_portfolio_id", limit: 4   t.integer  "user_id",            limit: 4   t.float    "leave_amount",       limit: 24   t.datetime "created_at",                    null: false   t.datetime "updated_at",                    null: false end  create_table "users", force: :cascade |t|   t.string   "email",                  limit: 255, default: "", null: false   t.string   "encrypted_password",   .   .   . end 

you should do

u = user.first u.user_leave_portfolios.first.leave_amount 

as have leave_amount in user_leave_portfolios not in leave_portfolios.