Add ability to remove merging orgs from the list

app/controllers/merge_requests_controller.rb

@@ -1,6 +1,6 @@
 class MergeRequestsController < ApplicationController
   before_action :authenticate_user!
-  before_action :find_resource, only: %i[organisations update_organisations]
+  before_action :find_resource, only: %i[organisations update_organisations remove_merging_organsiation]
 
   def create
     @merge_request = MergeRequest.create!(merge_request_params)
@@ -26,6 +26,14 @@ class MergeRequestsController < ApplicationController
     end
   end
 
+  def remove_merging_organsiation
+    MergeRequestOrganisation.find_by(merge_request_organisation_params).destroy
+    @merge_request.reload
+    @answer_options = organisations_answer_options
+    @merging_organisations_list = [@merge_request.requesting_organisation] + @merge_request.merging_organisations
+    render :organisations
+  end
+
 private
 
   def organisations_answer_options

config/routes.rb

@@ -127,6 +127,7 @@ Rails.application.routes.draw do
     post "merge-request", to: "merge_request#create_merge_request"
     get "organisations", to: "merge_requests#organisations"
     patch "organisations", to: "merge_requests#update_organisations"
+    get "organisations/remove", to: "merge_requests#remove_merging_organsiation"
   end
 
   resources :lettings_logs, path: "/lettings-logs" do

spec/requests/merge_requests_controller_spec.rb

@@ -93,5 +93,21 @@ RSpec.describe MergeRequestsController, type: :request do
         end
       end
     end
+
+    describe "#remove_organisation" do
+      let(:params) { { merge_request: {merging_organisation: other_organisation.id } }} 
+
+      context "when removing an organisation from merge request " do
+        before do
+          MergeRequestOrganisation.create!(merge_request_id: merge_request.id, merging_organisation_id: other_organisation.id)
+          get "/merge-request/#{merge_request.id}/organisations/remove", headers:, params:
+        end
+
+        it "updates the merge request" do
+          expect(merge_request.merging_organisations.count).to eq(0)
+          expect(page).not_to have_link("Remove")
+        end
+      end
+    end
   end
 end