[英]Rails Associations Not working, user_id not showing in console
In console I get this error: 在控制台中,我得到此错误:
peegin.user
NameError: undefined local variable or method `peegin' for main:Object
Did you mean? @peegin
Also when i try to access Peegin in console it doesn't display user_id
: 另外,当我尝试在控制台中访问Peegin时,它不显示user_id
:
Peegin
=> Peegin(id: integer, title: string, meaning: string, example: string, created_at: datetime, updated_at: datetime, permalink: string)
2.3.0 :039 >
User Class 用户类别
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 :peegins
end
Peegin Class Peegin类
class Peegin < ActiveRecord::Base
belongs_to :user
before_create :generate_permalink
def to_param
permalink
end
private
def generate_permalink
pattern=self.title.parameterize
duplicates = Peegin.where(permalink: pattern)
if duplicates.present?
self.permalink = "#{pattern}-#{duplicates.count+1}"
else
self.permalink = self.title.parameterize
end
end
end
Schema 架构图
ActiveRecord::Schema.define(version: 20160804115242) do
create_table "peegins", force: :cascade do |t|
t.string "title"
t.string "meaning"
t.string "example"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "permalink"
t.integer "user_id"
end
add_index "peegins", ["user_id"], name: "index_peegins_on_user_id", unique: true
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
add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
end
Make sure your database is up to date. 确保您的数据库是最新的。
$ bin/rake db:migrate
Then.. you have to create a Peegin object and then you can access the user: 然后..您必须创建一个Peegin对象,然后可以访问用户:
peegin = Peegin.create(title: "something")
peegin.user # => nil
peegin.user = User.first # Or take any user you want.
peegin.save # => user_id is updated in the database
In your rails console please try this: 在您的Rails控制台中,请尝试以下操作:
@peegin = Peegin.find(1) //IF one doesn't work make sure if database has a record with this id and try with id that exists.
then use 然后使用
@peegin.user
Instead of 代替
peegin.user
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