Undefined method for form edit text value ROR - ruby-on-rails

Question

I am trying to send some data from view to controller. I am using form. I have one manufacturer controller and one user controller. What I want to do whenever I am creating new manufacturer I am also creating new user with certain values.So my form contains few values for manufacturer and few for user. I tried these things in following ways:
// inside ManufacturersController
def new
#manufacturer = Manufacturer.new
#user = User.new
end
def create
#manufacturer = Manufacturer.new(manufacturer_params)
#user = User.new(user_params)
#manufacturer.save
redirect_to #manufacturer
end
private
def manufacturer_params
params.permit(:name, :license_no, :contact_no, :address, :country, :city, :pincode,:email_id)
end
def user_params
params.permit(:email, :password, :confirm_password)
end
// inside form view
<div class="form-group">
<label class="col-sm-3 control-label">Email Id</label>
<div class="col-sm-3">
<input class="form-control" name="email_id" value="<%= #manufacturer.email_id %>">
</div>
<div class="form-group">
<label class="col-sm-3 control-label">Password</label>
<div class="col-sm-6">
<input class="form-control" name="password" value="<%= #user.password %>">
</div>
Above code is not completed code. I getting error at my form field password. It shows error undefined method password for #<User:0x7a42580>
Am I doing anything wrong? Need some help. Thank you.

Answer 1

In Rails you pass the params for a resource in a hash:
user: { name: 'Max' }
That how the built in form helpers work and it's a good practice.
When creating forms you can use the form helpers to get the correct html name attribute for your inputs.
<%= form_for(#user) do %>
<%= f.text_field :email # user[name] %>
<%= f.password_field :password # user[password] %>
<% end %>
Rails will bind the value of #user.email to the email field.
When you want to create multiple records at once you can use accepts_nested_attributes_for:
class Manufacturer < ActiveRecord::Base
has_many :users
accepts_nested_attributes_for :users
validates_associatiated :users
end
class User < ActiveRecord::Base
belongs_to :manufacturer
end
this lets you do Manufacturer.new(name: 'Acme Corp', users_attibutes: [{ name: 'Max' }]) to create both a Manufacturer and a nested User at once.
This is how you would setup your controller
class ManufacturersController
# ...
def new
#manufacturer = Manufacturer.new
#manufacturer.users.build
end
def create
#manufacturer = Manufacturer.create(manufacturer_params)
# ...
end
private
def manufacturer_params
params.require(:manufacturer)
.permit(
:name, :license_no, :contact_no, :address, :country,
:city, :pincode, :email_id,
users_attributes: [:email, :password, :confirm_password]
)
end
end
And your form:
<%= form_for(#manufacturer) do |f| %>
<%= f.text_field :name # manufacturer[name] %>
<%= f.text_field :license_no %>
...
<%= f.fields_for(:users) do |user_fields| %>
<%= user_fields.text_field :email # manufacturer[users_attibutes][1][email] %>
...
<% end &>
<% end %>
As #Venkat ch already has pointed out storing plaintext passwords in the database is really insecure. Use has_secure_password instead.