我有一个应用程序，其功能类似于Stackoverflow的简化版本（询问，回答，投票）。它在我的计算机上可以正常工作，但是当我在Heroku上部署它时，我在Heroku日志中收到此错误：
ActiveModel :: MissingAttributeError（无法写入未知属性user_id）。
在Heroku上，应用程序告诉我“出了点问题，请检查日志”
我的问题是user_id确实存在于我的表中。所以我真的不知道为什么它不知道这个属性。我也可以登录并没有问题地创建用户。但是，当我想提出一个新问题时，我会收到此错误。...
问题控制器：
class QuestionsController < ApplicationController
before_action :private_access, except: [:index, :show]
def index
@questions = if params[:term]
Question.where("title iLIKE ? OR description iLIKE ?" , "%#{params[:term]}%", "%#{params[:term]}%")
else
@questions = Question.all.order("updated_at DESC")
end
end
def new
@question = Question.new
end
def create
@question = Question.new(questions_params)
@question.user = current_user
if @question.save
flash[:success] = "Fantastic #{@current_user.username} you posed a new question. Surely someone answers soon, stay tuned..."
redirect_to root_path
else
render :new
end
end
def show
@question = Question.find(params[:id])
@answer = Answer.new
@comment = Comment.new
@vote = Vote.new
end
def edit
@question = Question.find(params[:id])
end
def update
@question = Question.find(params[:id])
if @question.update(questions_params)
flash[:success] = "Bravo #{@current_user.username}, you updated your question!"
redirect_to root_path
else
flash[:danger] = "Ups, something went wrong. Please try again..."
render :new
end
end
def destroy
@question = Question.find(params[:id])
if @question.destroy
flash[:danger] = "Ok #{@current_user.username}, question was deleted!"
redirect_to root_path
else
flash[:danger] = "Ups, something went wrong. Please try again..."
redirect_to root_path
end
end
def voteup
question = Question.find(params[:id])
question.votes.create(user: current_user)
flash[:success] = "Thanks #{current_user.username} for voting!"
redirect_to question_path
end
def votedown
question = Question.find(params[:id])
question.votes.where(user: current_user).take.try(:destroy)
flash[:danger] = "Vote deleted!"
redirect_to question_path
end
private
def questions_params
params.require(:question).permit(:title, :description, :answer_id, :user_id, :body, :votes, :term)
end
end
这是我的架构：
create_table "answers", force: :cascade do |t|
t.text "body"
t.bigint "question_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.bigint "user_id"
t.index ["question_id"], name: "index_answers_on_question_id"
t.index ["user_id"], name: "index_answers_on_user_id"
end
create_table "comments", force: :cascade do |t|
t.string "commentable_type"
t.integer "commentable_id"
t.integer "user_id"
t.text "body"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "questions", force: :cascade do |t|
t.string "title"
t.text "description"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.bigint "user_id"
t.index ["user_id"], name: "index_questions_on_user_id"
end
create_table "users", force: :cascade do |t|
t.string "email", limit: 100
t.string "password_digest"
t.string "name", limit: 100
t.string "username", limit: 50
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "votes", force: :cascade do |t|
t.integer "voteable_id"
t.string "voteable_type"
t.string "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_foreign_key "answers", "questions"
end
我的模型关联应该很好：
class User < ApplicationRecord
has_secure_password validations: false
has_many :answers, dependent: :destroy
has_many :questions, dependent: :destroy
has_many :comments, dependent: :destroy
has_many :votes, dependent: :destroy
validates :email, uniqueness: true, format: /@/
validates :password, presence: true, on: :create
validates :password, length: {in: 6..20 }, allow_nil: true
validates :name, presence: true
validates :username, presence: true
结束
class Question < ApplicationRecord
validates :title, presence: true
validates :description, presence: true, length: {minimum:10, maximum:10000}
belongs_to :user
has_many :comments, as: :commentable, dependent: :destroy
has_many :answers, dependent: :destroy
has_many :votes, as: :voteable, dependent: :destroy
到目前为止我尝试过的：
我们非常感谢您的帮助。提前非常感谢
编辑：我试图重置数据库，删除了该应用程序，然后再次迁移....似乎Heroku没有在问题中添加任何user_id，还是我错了吗？它给了我以下内容
CREATE TABLE "questions" ("id" bigserial primary key, "title" character varying, "description" text, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL)
-> 0.0137s
== 20180620183722 CreateQuestions: migrated (0.0138s) =========================
D, [2018-07-11T14:56:58.545105 #4] DEBUG -- : ActiveRecord::SchemaMigration Create (1.6ms) INSERT INTO "schema_migrations" ("version") VALUES ($1) RETURNING "version" [["version", "20180620183722"]]
D, [2018-07-11T14:56:58.548517 #4] DEBUG -- : (3.0ms) COMMIT
I, [2018-07-11T14:56:58.548687 #4] INFO -- : Migrating to CreateAnswers (20180624115634)
D, [2018-07-11T14:56:58.550810 #4] DEBUG -- : (1.3ms) BEGIN
== 20180624115634 CreateAnswers: migrating ====================================
-- create_table(:answers)
D, [2018-07-11T14:56:58.562192 #4] DEBUG -- : (10.4ms) CREATE TABLE "answers" ("id" bigserial primary key, "body" text, "question_id" bigint, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL, CONSTRAINT "fk_rails_3d5ed4418f"
FOREIGN KEY ("question_id")
REFERENCES "questions" ("id")
)
D, [2018-07-11T14:56:58.573617 #4] DEBUG -- : (4.7ms) CREATE INDEX "index_answers_on_question_id" ON "answers" ("question_id")
-> 0.0228s
== 20180624115634 CreateAnswers: migrated (0.0229s) ===========================
D, [2018-07-11T14:56:58.577497 #4] DEBUG -- : ActiveRecord::SchemaMigration Create (2.6ms) INSERT INTO "schema_migrations" ("version") VALUES ($1) RETURNING "version" [["version", "20180624115634"]]
D, [2018-07-11T14:56:58.580639 #4] DEBUG -- : (2.6ms) COMMIT
I, [2018-07-11T14:56:58.580776 #4] INFO -- : Migrating to CreateUsers (20180705164230)
D, [2018-07-11T14:56:58.582856 #4] DEBUG -- : (1.3ms) BEGIN
== 20180705164230 CreateUsers: migrating ======================================
-- create_table(:users)
D, [2018-07-11T14:56:58.596461 #4] DEBUG -- : (12.6ms) CREATE TABLE "users" ("id" bigserial primary key, "email" character varying(100), "password_digest" character varying, "name" character varying(100), "username" character varying(50), "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL)
-> 0.0135s
== 20180705164230 CreateUsers: migrated (0.0137s) =============================
D, [2018-07-11T14:56:58.603402 #4] DEBUG -- : ActiveRecord::SchemaMigration Create (1.5ms) INSERT INTO "schema_migrations" ("version") VALUES ($1) RETURNING "version" [["version", "20180705164230"]]
D, [2018-07-11T14:56:58.606167 #4] DEBUG -- : (2.1ms) COMMIT
I, [2018-07-11T14:56:58.606393 #4] INFO -- : Migrating to CreateComments (20180708124323)
D, [2018-07-11T14:56:58.609250 #4] DEBUG -- : (1.4ms) BEGIN
== 20180708124323 CreateComments: migrating ===================================
-- create_table(:comments)
D, [2018-07-11T14:56:58.622279 #4] DEBUG -- : (9.5ms) CREATE TABLE "comments" ("id" bigserial primary key, "commentable_type" character varying,"commentable_id" integer, "user_id" integer, "body" text, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL)
-> 0.0129s
== 20180708124323 CreateComments: migrated (0.0130s) ==========================
D, [2018-07-11T14:56:58.624708 #4] DEBUG -- : ActiveRecord::SchemaMigration Create (1.4ms) INSERT INTO "schema_migrations" ("version") VALUES ($1) RETURNING "version" [["version", "20180708124323"]]
D, [2018-07-11T14:56:58.627539 #4] DEBUG -- : (2.5ms) COMMIT
I, [2018-07-11T14:56:58.627685 #4] INFO -- : Migrating to CreateVotes (20180709152735)
D, [2018-07-11T14:56:58.629887 #4] DEBUG -- : (1.3ms) BEGIN
== 20180709152735 CreateVotes: migrating ======================================
-- create_table(:votes)
D, [2018-07-11T14:56:58.639342 #4] DEBUG -- : (8.6ms) CREATE TABLE "votes" ("id" bigserial primary key, "voteable_id" integer, "voteable_type" character varying, "user_id" character varying, "created_at" timestamp NOT NULL, "updated_at" timestamp NOT NULL)
-> 0.0094s
== 20180709152735 CreateVotes: migrated (0.0095s) =============================
D, [2018-07-11T14:56:58.642138 #4] DEBUG -- : ActiveRecord::SchemaMigration Create (1.4ms) INSERT INTO "schema_migrations" ("version") VALUES ($1) RETURNING "version" [["version", "20180709152735"]]
D, [2018-07-11T14:56:58.644622 #4] DEBUG -- : (2.1ms) COMMIT
D, [2018-07-11T14:56:58.656312 #4] DEBUG -- : ActiveRecord::InternalMetadata Load (1.5ms) SELECT "ar_internal_metadata".* FROM "ar_internal_metadata" WHERE "ar_internal_metadata"."key" = $1 LIMIT $2 [["key", "environment"], ["LIMIT", 1]]
D, [2018-07-11T14:56:58.671265 #4] DEBUG -- : (5.5ms) BEGIN
D, [2018-07-11T14:56:58.674884 #4] DEBUG -- : ActiveRecord::InternalMetadata Create (1.7ms) INSERT INTO "ar_internal_metadata" ("key", "value", "created_at", "updated_at") VALUES ($1, $2, $3, $4) RETURNING "key" [["key", "environment"], ["value", "production"], ["created_at", "2018-07-11 14:56:58.671911"], ["updated_at", "2018-07-11 14:56:58.671911"]]
D, [2018-07-11T14:56:58.677921 #4] DEBUG -- : (2.6ms) COMMIT
D, [2018-07-11T14:56:58.680372 #4] DEBUG -- : (2.1ms) SELECT pg_advisory_unlock(2612648823889037010)
➜ RubyOnCrack git:(master) ✗
答案 0 :(得分：0)
我想也许错误正在这里抛出？
def create
@question = Question.new(questions_params)
@question.user = current_user
if @question.save
flash[:success] = "Fantastic #{@current_user.username} you posed a new question. Surely someone answers soon, stay tuned..."
redirect_to root_path
else
render :new
end
end
出于好奇，您是否尝试过：
def create
@question = current_user.questions.build(questions_params)
if @question.save
flash[:success] = "Fantastic #{@current_user.username} you posed a new question. Surely someone answers soon, stay tuned..."
redirect_to root_path
else
render :new
end
end
如果这不起作用，您是否可以在控制台中创建新记录？
答案 1 :(得分：0)
我在您的帮助下进行了修复。我需要做的是：
现在它正在工作。无论如何，如果您想签出此应用程序的链接，请使用以下链接：https://rubyoncrack.herokuapp.com/