NoMethodError in Account::PostsController#index - ruby-on-rails

Question

I'm the newbie, my rails version is 4.2.0 and I install three gem devise, cancancan, rolify. When I sign up success, I got this message
NoMethodError in Account::PostsController#index
undefined method `role' for #<User:0x007fd84c2afba8>
def admin?
self.role.name == "admin"
end
end
I guess the problem is users, roles the connection is miss. And I try to modify my user.rb but not work.
This is my app/models/ability.rb code
class Ability
include CanCan::Ability
def initialize(user)
if user.admin?
can :manage, :all
else
can :update, Post do |post|
post.user == user
end
can :destroy, Post do |post|
post.user == user
end
can :create, Post
end
end
end
app/models/user.rb
class User < ActiveRecord::Base
has_many :posts
############################################################
# not work
# belongs_to :users_roles
# has_and_belongs_to_many :roles, :join_tabe => :users_roles
# has_one :users_role
############################################################
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
def admin?
self.role.name == "admin"
end
end
app/models/role.rb
class Role < ActiveRecord::Base
has_and_belongs_to_many :users, :join_table => :users_roles
belongs_to :resource, :polymorphic => true
validates :resource_type,
:inclusion => { :in => Rolify.resource_types },
:allow_nil => true
scopify
end
When I sign up I will add a role to first sign up user, this is my application_controller.rb
def after_sign_in_path_for(resource)
if resource.is_a?(User)
if User.count == 1
resource.add_role 'admin'
else
resource.add_role 'normal'
end
resource
end
root_path
end
schema.rb
ActiveRecord::Schema.define(version: 20160225105659) do
# These are extensions that must be enabled in order to support this database
enable_extension "plpgsql"
create_table "ckeditor_assets", force: :cascade do |t|
t.string "data_file_name", null: false
t.string "data_content_type"
t.integer "data_file_size"
t.integer "assetable_id"
t.string "assetable_type", limit: 30
t.string "type", limit: 30
t.integer "width"
t.integer "height"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "ckeditor_assets", ["assetable_type", "assetable_id"], name: "idx_ckeditor_assetable", using: :btree
add_index "ckeditor_assets", ["assetable_type", "type", "assetable_id"], name: "idx_ckeditor_assetable_type", using: :btree
create_table "posts", force: :cascade do |t|
t.string "title"
t.text "content"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "user_id"
end
create_table "roles", force: :cascade do |t|
t.string "name"
t.integer "resource_id"
t.string "resource_type"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "roles", ["name", "resource_type", "resource_id"], name: "index_roles_on_name_and_resource_type_and_resource_id", using: :btree
add_index "roles", ["name"], name: "index_roles_on_name", using: :btree
create_table "travel_events", force: :cascade do |t|
t.string "title"
t.datetime "start_date"
t.datetime "end_date"
t.text "note"
t.integer "travel_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "travels", force: :cascade do |t|
t.string "title"
t.datetime "start_date"
t.datetime "end_date"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "users", force: :cascade 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.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "name"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true, using: :btree
add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true, using: :btree
create_table "users_roles", id: false, force: :cascade do |t|
t.integer "user_id"
t.integer "role_id"
end
add_index "users_roles", ["user_id", "role_id"], name: "index_users_roles_on_user_id_and_role_id", using: :btree
end

Answer 1

I think you forgot to add
has_one :users_role
in user.rb

Answer 2

I find the answer, but I'm not sure the question is table's relationship.
I remove my user.rb's admin method
user.rb
class User < ActiveRecord::Base
rolify
has_many :posts
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
# def admin?
# self.role.name == "admin"
# end
end
And modify ability.rb
ability.rb
class Ability
include CanCan::Ability
def initialize(user)
# if user.admin?
if user.has_role?(:admin) # modify this line
can :manage, :all
else
can :update, Post do |post|
post.user == user
end
can :destroy, Post do |post|
post.user == user
end
can :create, Post
can :read, Post
end
end
end