Add action MembershipApplicationsController#create

app/controllers/membership_applications_controller.rb

@@ -1,8 +1,36 @@
 # frozen_string_literal: true
 
 class MembershipApplicationsController < ApplicationController
+  CREATE_ATTRIBUTES = %i[
+    first_name
+    last_name
+    middle_name
+    date_of_birth
+    occupation
+    email
+    phone_number
+    telegram_username
+    organization_membership
+    comment
+  ].freeze
+
   # GET /membership_applications/new
   def new
     @membership_application = MembershipApplication.new
   end
+
+  # POST /membership_applications
+  def create
+    @membership_application = MembershipApplication.new create_params
+
+    return render :new unless @membership_application.save
+
+    redirect_to root_url
+  end
+
+private
+
+  def create_params
+    params.require(:membership_application).permit(CREATE_ATTRIBUTES)
+  end
 end

spec/requests/membership_applications/create_spec.rb

@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'POST /membership_applications' do
+  let :membership_application_attributes do
+    attributes_for :membership_application
+  end
+
+  def make_request
+    post '/membership_applications',
+         params: { membership_application: membership_application_attributes }
+  end
+
+  specify do
+    expect { make_request }.to \
+      change(MembershipApplication, :count).from(0).to(1)
+  end
+
+  context 'after request' do
+    before do
+      make_request
+    end
+
+    specify do
+      expect(MembershipApplication.last).to \
+        have_attributes membership_application_attributes
+    end
+  end
+end