First argument in form cannot contain nil or be empty - html

Question

Ive looked at atleast 8 other forums with the same title and none of the ones read helped me at all!
So im using a partial to render a form to a edit.html.erb page and a new.html.erb page. My controller page works except for the edit page!
Here is my code for my controller page :
class ProfilesController < ApplicationController
def new
# form where a user can fill out their own profile.
#user = User.find( params[:user_id] )
#profile = Profile.new
end
def create
#user = User.find( params[:user_id] )
#profile = #user.build_profile(profile_params)
if #profile.save
flash[:success] = "Profile Updated!"
redirect_to user_path( params[:user_id] )
else
render action: :new
end
end
def edit
#user = User.find( params[:id] )
#profile = #user.profile
end
private
def profile_params
params.require(:profile).permit(:first_name, :last_name, :job_title, :phone_number, :contact_email, :description)
end
end
my edit.html.erb page:
<div class="row">
<div class="col-md-6 col-md-offset-3">
<h1 class="text-center">Edit Your Profile</h1>
<p class="text-center">Be a part of the Dev Match community and fill out your profile!</p>
<div class="well">
<%= render 'form' %>
</div>
</div>
</div>
my new.html.erb page:
<div class="row">
<div class="col-md-6 col-md-offset-3">
<h1 class="text-center">Create Your Profile</h1>
<p class="text-center">Be a part of the Dev Match community and fill out your profile!</p>
<div class="well">
<%= render 'form' %>
</div>
</div>
</div>
and _form.html.erb:
<%=form_for (#profile) , url: user_profile_path do |f| %>
<div class="form-group">
<%= f.label :first_name %>
<%= f.text_field :first_name, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.label :last_name %>
<%= f.text_field :last_name, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.label :job_title %>
<%= f.select :job_title, ['Developer', 'Entrepreneur', 'Investor'], {}, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.label :phone_number %>
<%= f.text_field :phone_number, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.label :contact_email %>
<%= f.text_field :contact_email, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.label :description %>
<%= f.text_area :description, class: 'form-control' %>
</div>
<div class="form-group">
<%= f.submit "Update Profile", class: 'btn btn-primary' %>
</div>
<% end %>

Answer 1

You change your code into this:
def edit
#user = User.find(params[:user_id])
#profile = #user.profile
end

Answer 2

#user is null because the id does not exist in DB.
If you create a new instance of User in the action new you can use the same object in the action create without use the method User.find
As improvement, try to add before_action in your controller.
class ProfilesController < ApplicationController
before_action :prepare_model, except: [:new, :create]
def new
# form where a user can fill out their own profile.
#user = User.new
#profile = Profile.new
end
def create
#profile = #user.build_profile(profile_params)
if #profile.save
flash[:success] = "Profile Updated!"
redirect_to user_path( params[:user_id] )
else
render action: :new
end
end
def edit
#profile = #user.profile
end
private
def prepare_model
#user = User.find(params[:user_id])
raise ActiveRecord::RecordNotFound if #user.nil?
end
def profile_params
params.require(:profile).permit(:first_name, :last_name, :job_title, :phone_number, :contact_email, :description)
end
end