how to populate belongs_to model with Faker gem

Question

Current schema is this:

ActiveRecord::Schema.define(version: 20160622075955) do

  # These are extensions that must be enabled in order to support this database
  enable_extension "plpgsql"

  create_table "posts", force: :cascade do |t|
    t.string   "title"
    t.string   "body"
    t.date     "date"
    t.integer  "user_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  add_index "posts", ["user_id"], name: "index_posts_on_user_id", using: :btree

  create_table "users", force: :cascade do |t|
    t.string   "first_name"
    t.string   "last_name"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
  end

  add_index "users", ["first_name"], name: "index_users_on_first_name", using: :btree
  add_index "users", ["last_name"], name: "index_users_on_last_name", using: :btree

  add_foreign_key "posts", "users"
end

Trying to populate both models: Posts & Users

This is what I have for seeds.rb

20.times do |n| 
    a = User.new
    a.first_name = Faker::Name.first_name
    a.last_name = Faker::Name.last_name

    a.save

end

10.times do |n|
    b = Post.new
    b.title = Faker::Book.title
    b.body = Faker::Lorem.words(4, true)
    b.date = Faker::Time.between(DateTime.now - 1, DateTime.now) 

    b.save
end

It works for User but not for Post. How do I also populate Post as well?

EDIT

Post's Model

class Post < ActiveRecord::Base
  belongs_to :user
  validates :title, :body, presence: true
  validates :title, length: { maximum: 40 }
end

User's Model

class User < ActiveRecord::Base
    has_many :posts
    validates :first_name, :last_name, presence: true
end

User's Controller

class UsersController < ApplicationController
  def index
    @users = User.all
  end

  def show
    @user = User.find(params[:id])
  end

  def new
    @user = User.new
  end

  def create
    @user = User.new(user_params)
    if @user.save 
      flash[:notice] = "User successfully added!"
      redirect_to users_path
    else
      render :new
    end
  end

  def edit
    @user = User.find(params[:id])
    render :edit
  end

  def update
    @user = User.find(params[:id])
    if @user.update(user_params)
      redirect_to users_path
    else
      render :edit
    end
  end

  def destroy
    @user = User.find(params[:id])
    @user.destroy
      redirect_to users_path
  end

  private 

    def user_params
      params.require(:user).permit(:first_name, :last_name)
    end

end

Post's Controllers

class PostsController < ApplicationController

  def new 
    @user = User.find(params[:user_id])
    @post = @user.posts.new
  end

  def edit
    @user = User.find(params[:user_id])
    @post = @user.posts.find(params[:id])
    render :edit
  end

  def create 
    @user = User.find(params[:user_id])
    @post = @user.posts.new(post_params)
    if @post.save 
      redirect_to user_path(@post.user)
    else
      render :new
    end
  end

  def update 
    @user = User.find(params[:user_id])
    @post = @user.posts.find(params[:id])
    if @post.update(post_params)
      redirect_to user_path(@post.user)
    else
      render 'edit'
    end
  end


  def destroy
    @user = User.find(params[:user_id])
    @post = @user.posts.find(params[:id])
    @post.destroy
      redirect_to users_path
    end

  private 

  private 
    def post_params
      params.require(:post).permit(:title, :body, :date)
    end
end

EDIT TWO

No errors shows up when I put puts b.errors.inspect in the seeds.rb file.

However, this is what shows up in the terminal when I run rake db:seed

#, @messages={}>
#, @messages={}>
#, @messages={}>
#, @messages={}>
#, @messages={}>
#, @messages={}>
#, @messages={}>
#, @messages={}>
#, @messages={}>
#, @messages={:title=>["is too long (maximum is 40 characters)"]}>

dpedoneze · Accepted Answer

The error is that the Faker some times are creating titles that are bigger than 40 characters. (look that in the example above, you've created 9 posts (because they have an ID) and only one failed (with the error message at the end)

@messages={:title=>["is too long (maximum is 40 characters)"]}

If you wanna use the Faker, you can cut the title.

b.title = Faker::Book.title[0..40] 
# it will get only the first 40 characters

This way you'll create 20 users with 1 post for each one. You can add another 5.times do ... end wrapping the Post creation so you'll have 5 post for each user. You can also create only one user and then set all post.user = User.first, so you'll have one user with lots of Posts.

20.times do
    user = User.new
    user.first_name = Faker::Name.first_name
    user.last_name = Faker::Name.last_name

    user.save

    post = Post.new
    post.title = Faker::Book.title[0..40]
    post.body = Faker::Lorem.words(4, true)
    post.date = Faker::Time.between(DateTime.now - 1, DateTime.now) 
    post.user = user
    post.save
end

how to populate belongs_to model with Faker gem

Answers (1)

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