Issue with belongs_to and user (devise) - ruby-on-rails

Question

I'm new to RoR, and I would like to develop an app, but I have an issue with the belongs_to association. I am using devise for the authentication of my users, and I have an object called timesheet, I followed several tutorials and read a lot of forums but unfortunately user_id remains null in my db, so I do not know where does the problem come from.
If you can tell how to fix it, any links that can helps me, that would be great.
Schema.rb:
ActiveRecord::Schema.define(version: 20150128160116) do
create_table "timesheets", force: true do |t|
t.date "date"
t.time "working_start_time"
t.time "working_end_time"
t.integer "breaks"
t.integer "user_id"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "timesheets", ["user_id"], name: "index_timesheets_on_user_id"
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.integer "current_sign_in_ip"
t.integer "last_sign_in_ip"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true
add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
end
timesheets_controller.rb
class TimesheetsController < ApplicationController
layout 'application'
def show
#timesheet=Timesheet.find(params[:id])
end
def index
#timesheet = Timesheet.all
end
def new
#timesheet = Timesheet.new
end
def create
#timesheet = Timesheet.create(timesheet_params)
redirect_to new_timesheet_path
end
def edit
#timesheet=Timesheet.find(params[:id])
end
def update
#timesheet = Timesheet.find(params[:id])
#timesheet.update_attributes(timesheet_params)
redirect_to student_table_path
end
user.rb model
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_many :timesheets
end
Timesheet.rb model
class Timesheet < ActiveRecord::Base
belongs_to :user
validates :user_id, :presence => true
end
Thanks in advance.

Answer 1

It will stay null because you are not using it in the timesheetsController, your create action should be like this :
def create
#timesheet = current_user.timesheets.build(timesheet_params)
redirect_to new_timesheet_path
end
You have to use that build method to reference the current_user, so the timesheet will have the current_user in the user_id field.