unknown attribute 'email' for [has_many association] when trying to create - ruby-on-rails

Question

I have a model User that i've set up a has_many/belongs_to association with posts, and I'm trying to test my posts controller in rspec. However, when I try to create a post that belongs to a user, I get the error: undefined method 'email=' for #<Post:0x00000...>
I am creating the Post like so:
before(:each) do
#user = User.create!({email: "email#gmail.com", password: "password"})
#post = #user.posts.create!({title: "title", content: "content"})
end
I'm not sure why it's trying to find an email method for the post, as there is none that exists.
I also get this error when I try to create a new post in the rails console. I can do p = Post.new(...), but i get the error when I save it. (p.save!)
I also get the error when I try to create a post like so:
Post.create({title: "title", content: "content", user_id: 1 })
Does anyone have any idea why this error is showing up and how I can fix it? Thanks!
--
My post model looks like this:
class Post < ActiveRecord::Base
devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable
belongs_to :user
end

Answer 1

This line in the Post model is causing the problems. devise by default requires an email column so that is why it's complaining of it not existing. Simply remove the line from the Post model.
devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable

Answer 2

Based on the given information, this is how the files should look:
models/user.rb
class User < ActiveRecord::Base
devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable
has_many :posts
end
models/post.rb
class Post < ActiveRecord::Base
belongs_to :user
end
User migration
class DeviseCreateUsers < ActiveRecord::Migration[5.0]
def change
create_table :users do |t|
## Database authenticatable
t.string :name, null: false
t.string :email, null: false, default: ""
t.string :encrypted_password, null: false, default: ""
## Recoverable
t.string :reset_password_token
t.datetime :reset_password_sent_at
## Rememberable
t.datetime :remember_created_at
## Trackable
t.integer :sign_in_count, default: 0, null: false
t.datetime :current_sign_in_at
t.datetime :last_sign_in_at
t.inet :current_sign_in_ip
t.inet :last_sign_in_ip
## Confirmable
t.string :confirmation_token
t.datetime :confirmed_at
t.datetime :confirmation_sent_at
t.string :unconfirmed_email
t.timestamps null: false
end
add_index :users, :name
add_index :users, :email, unique: true
add_index :users, :reset_password_token, unique: true
add_index :users, :confirmation_token, unique: true
add_index :users, :unlock_token, unique: true
end
end
Post migration
class CreatePosts < ActiveRecord::Migration[5.0]
def change
create_table :notes do |t|
t.string :title, null: false
t.text :content, null: false
t.timestamps null: false
end
end
end