How can I disable pre-fill form fields in Rails

Questions

I m making a to-do list with Rails. Therefore I made a user-model(email and password). I want that the user will be able to edit there account so I made a edit and update action on the user controller I also have a user model. Everything works great but my issue is that on the settings view the text_field for updating the email is already prefilled with their current email adress in the model. I want to disable the prefilling because of design aspects (content of the placeholder should be readable right away). I know that when I will solve this problem, there will be another issue with the user model. For example if a user only wants to change the password the user will get an error message such as: "Email can t be blank" and "Email is Invalid"... I was able to modify the minimum length validation for the password if the password is blank because I knew that "has_secure_password" enforces presence validations upon object creation. So I knew new users won t be able to sign up with blank passwords. But how can I create the same effect for the email validation? I haven t found a solution yet, I would really appreciate if someone could help me. Thanks in advance!

Questions:

• How to disable the pre-fill form in Rails?
• What should be modified to accept blank emails in the settings form
without updating the email to blank in database?

  users_controller.rb (controller)   

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

def update 
 @user = User.find(params[:id])
 if @user.update_attributes(user_params)
  flash[:success] = "Profile updated!"
  redirect_to @user
 else
  render  edit 
 end
end

  edit.html.erb (view)   

<% provide(:title, "Settings") %>
<h4>SETTINGS</h4>

<h5>User Edit</h5>
<%= @user.email %>
<div class="settings">
 <%= form_for(@user) do |f| %>
  <%= render  layouts/error_messages  %>

  <p>Change Email:</p>
  <%= f.text_field :email, placeholder: "New Email", class: "formfield" %>

  <p>Change Password:</p>
  <%= f.password_field :password, placeholder: "New Password", class: "formfield" %>
  <%= f.password_field :password_confirmation, placeholder: "New Password Confirmation", class: "formfield" %>


  <%= f.submit "Save Changes", class: "form_button" %>
 <% end %>

 <%= link_to "Delete my Account",  #  %>
</div>

  user.rb (model)   

class User < ActiveRecord::Base
 before_save { self.email = email.downcase }
 VALID_EMAIL_REGEX = /A[w+-.]+@[a-zd-.]+.[a-z]+z/i
 validates :email, presence: true, length: { maximum: 255 },
                     format: { with: VALID_EMAIL_REGEX },
                 uniqueness: { case_sensitive: false }
 has_secure_password
 validates :password, length: { minimum: 6 }, allow_blank: true

 # Returns the hash digest of the given string.
 def User.digest(string)
  cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST :
                                                BCrypt::Engine.cost
  BCrypt::Password.create(string, cost: cost)
 end
end

Answers

How to disable the pre-fill form in Rails?

Adding value: nil for the field you want to disable pre-fill will do.

For example,

<%= f.text_field :email, value: nil, placeholder: "New Email", class: "formfield" %>

What should be modified to accept blank emails in the settings form without updating the email to blank in database?

Erase presence: true in the email validation .

validates :email, length: { maximum: 255 }, format: { with: VALID_EMAIL_REGEX }, uniqueness: { case_sensitive: false }

Source

License : cc by-sa 3.0

http://stackoverflow.com/questions/32783520/how-can-i-disable-pre-fill-form-fields-in-rails

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