Rails console shows 422 Unprocessable Entity when we submit a form that has not been permitted yet (must use strong parameters).
next terminal window: Ctrl + PgDn
Nested params in users_controller looks like this:
params.require(:user).permit(:username, :email, :password)
To use form_with we need to have
@user = User.new
in users#new.
Remember to use: form.email_field form.password_field
Input field values: value: 'default value here' placeholder: 'placeholder text here'
In the method for users#create use:
if @user.update(user_params)
On rewriting form_with form elements:
Remember: model: @user is singular
Remember: method: :patch for update
Remember: text_field, email_field, password_field
Learned: retrieved edit fields are overridden by defaults from placeholder and/or value, it seems difficult to refactor a partial out if we want to use placeholder/value.