Rails 5 Enum With Select Field Not Saving - ruby-on-rails

Question

I understand that this has been asked many times, but for some reason none of the other solutions worked for me. I'm still unable to save a field with an enum on update.When I pass a non-enum value, like first_name, with the same form, it updates just fine, but the enum value, gender, never saves even though it shows that it is...
View:
<%= form_for(#patient, url: patient_path(params[:id])) do |f| %>
<%= f.fields_for :role do |r| %>
<%= r.fields_for :user do |u| %>
<div class="keyvalue">
<div class="key"><p>Gender</p></div>
<div class="value">
<%= u.select :gender, User.genders.map { |key, value| [key.humanize, key] }, include_blank: '-Select A Gender-' %>
</div>
<div class="push"></div>
</div><!--keyvalue-->
<% end %>
<% end %>
<% end %>
Controller:
def update
#patient = Patient.find(params[:id])
if #patient.update(patient_params)
flash[:success] = "Patient's record has been updated."
redirect_to patient_path(params[:id])
else
flash[:error] = #patient.errors.full_messages.to_sentence
redirect_to patient_path(params[:id])
end
end
Log:
Parameters: {"utf8"=>"✓", "authenticity_token"=>"*********", "commit"=>"Update", "patient"=>{"role_attributes"=>{"user_attributes"=>{"first_name"=>"John", "middle_name"=>"Joseph", "last_name"=>"Doe", "date_of_birth"=>"1943-12-25", "gender"=>"male", "blood_type"=>"", "ethnicity"=>"", "marital_status"=>"", "id"=>"1"}, "id"=>"1"}}, "id"=>"1"}
Patient Load (0.1ms) SELECT "patients".* FROM "patients" WHERE "patients"."id" = ? LIMIT ? [["id", 1], ["LIMIT", 1]]
(0.0ms) begin transaction
Role Load (0.1ms) SELECT "roles".* FROM "roles" WHERE "roles"."roleable_id" = ? AND "roles"."roleable_type" = ? LIMIT ? [["roleable_id", 1], ["roleable_type", "Patient"], ["LIMIT", 1]]
User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT ? [["id", 1], ["LIMIT", 1]]
User Exists (0.1ms) SELECT 1 AS one FROM "users" WHERE "users"."username" = ? AND ("users"."id" != ?) LIMIT ? [["username", "dev"], ["id", 1], ["LIMIT", 1]]
SQL (0.3ms) UPDATE "users" SET "gender" = ?, "updated_at" = ? WHERE "users"."id" = ? [["gender", 0], ["updated_at", "2018-04-24 02:11:23.126843"], ["id", 1]]
(2.6ms) commit transaction
Redirected to http://localhost:3000/patients/1
Completed 302 Found in 10ms (ActiveRecord: 3.2ms)
Enum in User model:
enum gender: [:male, :female, :non_binary, :rather_not_say]
Migration:
t.integer :gender
The log shows no issue, it shows the gender field being updated, but if I go to the rails console it shows gender as nil