form_for omit specific fields from #user model - ruby-on-rails

Question

I have a user model: :name, :email, :password
Here is my form:
<%= form_for(#user) do |f| %>
<%= f.label :name %>
<%= f.text_field :name %>
<%= f.label :email %>
<%= f.text_field :email %>
<%= f.label :password %>
<%= f.text_field :password %>
<%= f.submit "Save" %>
<% end %>
I want to display the form without :password, when I remove the password attribute and submit the form, the fields do not update in the database. I get a rollback.

Answer 1

You can do something like:
object.attribute = value
object.save(:validate => false)
This will never call your validation
But remember this will never validates your email and name fields as well if they are blank.

Answer 2

Commenting this line in my user model fixed the issue:
validates :password, length: { minimum: 6 }
However, as noted in the comments, it is not sufficient.
A user can edit their own profile, an admin can edit their own and others profiles.
Here is a solution:
def update
#user = User.find_by_id(params[:id])
if current_user?(#user)
if #user.update_attributes(user_params)
flash[:success] = "Your profile updated"
redirect_to #user
else
render 'edit'
end
else
if #user.update_attributes(admin_params)
flash[:success] = "Others profile updated"
redirect_to #user
else
render 'admin_edit_user'
end
end
end
private
def user_params
params.require(:user).permit(:name, :email, :password)
end
def admin_params
params.require(:user).permit(:name, :email, :password) if current_user.admin?
end

Answer 3

If you want to skip validations on a particular form for a particular attribute, you could do the following.
Class User
attr_accessor :skip_password_validation
validate_presence_of :password, unless: -> { skip_password_validation }
end
This creates a virtual attribute that you can set and read but won't get persisted in the database.
Then you can put a hidden field for :skip_password_validation in whatever form you want and it will skip the validations.
<%= f.hidden_field :skip_password_validation, value: true %>
You'll also have to add this param to the user_params in the controller.