Remove duplication of implementations

app/controllers/chat_ops_controller.rb

-class ChatOpsController < ApplicationController
-  respond_to :json
-
-  skip_before_action :verify_authenticity_token
-  skip_before_action :authenticate_user!
-
-  def trigger
-    render json: { ok: true }
-  end
-end

app/models/project_services/chat_service.rb

 # Base class for Chat services
+# This class is not meant to be used directly, but only to inherrit from.
 class ChatService < Service
   default_value_for :category, 'chat'
 
@@ -12,7 +13,7 @@ class ChatService < Service
   end
 
   def trigger(params)
-    # implement inside child
+    raise NotImplementedError
   end
 
   def chat_user_params(params)

app/models/project_services/mattermost_chat_service.rb

@@ -5,7 +5,7 @@ class MattermostChatService < ChatService
   end
 
   def description
-    'Self-hosted Slack-alternative'
+    'Mattermost is an open source, self-hosted Slack-alternative'
   end
 
   def to_param

config/routes.rb

@@ -68,11 +68,6 @@ Rails.application.routes.draw do
   # Notification settings
   resources :notification_settings, only: [:create, :update]
 
-  # For slash commands to POST
-  namespace :chat_ops do
-    post :trigger
-  end
-
   draw :import
   draw :uploads
   draw :explore

spec/controllers/chat_ops_controller_spec.rb

-require 'rails_helper'
-
-RSpec.describe ChatOpsController, type: :controller do
-  describe "POST #trigger" do
-    it "returns http success" do
-      post :trigger
-
-      expect(response).to have_http_status(:success)
-    end
-  end
-end