Error using Devise new registration on my rails project - ruby-on-rails

Question

I am building my first rails application using the Devise gem for authentication.
The login works great but the new registration (sign up) page delivers an error on the PAGE and will not let me register.
See image
Is this an issue with strong parameters or my application controller. Your help would be greatly appreciated.

Answer 1

This is probably because you have validations enabled in your User model where you specified the email and password can't be blank.
So, you have to provide email and password of a user when trying to save the info.
Update
If that's not the case, then it could be related to strong parameters. See this thread.
In your application_controller.rb file, add the following:
before_filter :configure_permitted_parameters, if: :devise_controller?
def configure_permitted_parameters
devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:email, :password, :password_confirmation) }
devise_parameter_sanitizer.for(:sign_in) { |u| u.permit(:email, :password, :password_confirmation) }
end
Configure your other actions like above too.
More update
The main issue was in the sign up form as it was not using the form builder properly and was not posting the params. I modified the app/views/devise/registrations/new.html.erb file to this:
<h2>Be cool and sign up if you dont have an account:</h2>
<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
<%= devise_error_messages! %>
<div class="col-md-4">
<h2>Signup</h2>
<form class="form-signup">
<div class="form-group">
<label for="email">Email</label>
<%= f.text_field :email, class: "form-control", placeholder: "First Name", tabindex: "2" %>
</div>
<div class="form-group">
<label for="password">Password</label>
<%= f.password_field :password, class: "form-control", tabindex: "2", placeholder: "Password", required: true %>
</div>
<div class="form-group">
<label for="password_confirmation">Password</label>
<%= f.password_field :password_confirmation, class: "form-control", tabindex: "2", placeholder: "Password Confirmation", required: true %>
</div>
<div><%= f.submit "Sign up", class:"btn btn-primary"%></div>
</form>
<%= render "devise/shared/links" %>
</div>
</div>
</div>
<% end %>
</div>
making sure the params are posting to the controller properly, and everything is working as expected now.

Answer 2

With what I can see, and what you explained:
you filled in the email and password field
it went through your controller and then to the model
there is validation in your model that is complaining of the absence of email and password.
I am assuming that you are using the sign-up page generated by Devise (this is already set up to get a new user form, bound with a new instance of the User class).
From the above three points (and the assumption), it stands to reason that both the email and password that you filled in are getting lost somewhere along the way.
My guess will be that this is happening somewhere in your controller. According to your routes, that will be the registrations controller (the create action).
Do you have a custom registrations#create controller? if yes => I think your params are not being allowed into building the new User which the save action is being called on.
If that is the case, you will need something like:
def new_user_params
params.require(:user).permit(:email, :password, :password_confirmation)
end
and then building and saving the new user as:
#user = User.new(new_user_params)
#user.save
Hope this helps to throw some light into it...