modal form not creating user - ruby-on-rails

Question

I have created forms in rails with no problems before, but this is my first time doing it in a modal and I am not sure if that effects things. I don't think it does, but you never know. The problem is that new users are not being saved, and I am getting no useful errors as to why. Here is my form, in the modal:
<div class="modal-body">
<%= form_for #user do |f| %>
<%= f.label :first_name %><br>
<%= f.text_field :first_name, class: 'form-control', :required => true %><br>
<%= f.label :last_name %><br>
<%= f.text_field :last_name, class: 'form-control', :required => true %><br>
<%= f.label :user_name %><br>
<%= f.text_field :user_name, class: 'form-control', :required => true %><br>
<%= f.label :password %><br>
<%= f.password_field :password_digest, class: 'form-control', :required => true%><br>
<%= f.label :password_confirmation %><br>
<%= f.password_field :password_confirmation, class: 'form-control', :required => true%><br>
</div> <!-- modal body -->
<div class="modal-footer">
<%= f.submit "Sign Up"%><br>
</div>
<% end %>
and here is what is in my users controller:
def create
#user = User.create(user_params)
if #user.save
redirect_to root_path
else
redirect_to({:controller => 'application', :action => 'home'}, :notice => 'Account not created! Something is fishy.')
end
end
def user_params
params.require(:user).permit(:first_name, :last_name, :user_name, :password)
end
More than likely, I am missing something. My question is two part: A)what is wrong and B)how can I stop the modal window from closing and have it display the appropriate error to the user giving them a chance to fix it?

Answer 1

Try:
#user = User.new(user_params)
instead of:
#user = User.create(user_params)
Because, you are trying to save the user after this call.
When you use create, it calls create followed by save.
If you use: User.new(user_params), it will just load the user object with the specified user_params but will not save it. In the next line, when you call: #user.save then the user object will be saved if valid. Otherwise, not.
Also, you can try using: #user.save! instead of #user.save. Because, when you try to save an object using save! method, it will raise an exception if it can't save the object properly. That way, you will know if something went wrong.

Answer 2

Observe the elements/tags "" should inside form_for becuase closing tag is inside of it.
<%= form_for #user do |f| %>
<div class="modal-body">
......your stuff fields here
</div> <!-- modal body -->
<div class="modal-footer">
<%= f.submit "Sign Up"%><br>
</div>
<% end %>