rails Nested form fields are not rendering - ruby-on-rails

Question

I am trying to create a book consultation form with following fields from two models
User Model
- first_name
- last_name
- email
- contact_number
Message Model
:message_text
The desired form rendered should be presenting the user all the User Model fields along with a text area which would be :message_text for the Message Model.
The code of User Model is
class User < ActiveRecord::Base
has_many :messages
validates :first_name , presence: true
validates :last_name , presence: true
validates :email, presence: true
validates :contact_number,presence: true
accepts_nested_attributes_for :messages
end
The Code of Message Model
class Message < ActiveRecord::Base
validates :message_text, presence: true
belongs_to :user , :class_name => 'User', :foreign_key => 'id'
end
The index controller of User which renders the form looks like
def index
#users = User.all
#user = User.new
#user.messages.build
end
The view file looks like
<%= form_for(#user) do |f| %>
<div class="form-group">
<%= f.label :first_name %>
<%= f.text_field :first_name %>
</div>
<div class="form-group">
<%= f.label :last_name %>
<%= f.text_field :last_name %>
</div>
<div class="form-group">
<%= f.label :email %>
<%= f.text_field :email %>
</div>
<div class="form-group">
<%= f.label :contact_number %>
<%= f.text_field :contact_number %>
</div>
<div class="form-group">
**the fields_for does not get rendered at all into the HTML**
<%= f.fields_for :messages do |ff| %>
<%= ff.label :message_text %>
<%= ff.text_field :message_text %>
<% end %>
</div>
<div class="btn primary-btn">
<%= f.submit 'Book Free Consultation'%>
</div>
All other fields get rendered. Can anybody please help me in spotting the mistake . Thank you in advance

Answer 1

your migration file should be like below
class DeviseCreateUsers < ActiveRecord::Migration
def change
create_table(:users) do |t|
t.string :first_name
t.string :last_name
t.string :email
t.string :contact_number
end
end
end
class CreateMessages < ActiveRecord::Migration
def change
create_table(:messages) do |t|
t.string :message_text
t.references :user, index: true
end
end
end