[Add]: set up flow to add lms to course

app/controllers/api/v1/lmss_controller.rb

@@ -1,10 +1,45 @@
 module Api
   module V1
     class LmssController < BaseController
-      before_action :validate_name!, only: [:create]
+      before_action :validate_ids!, only: [:create]
 
+      # POST /courses/:course_id/lmss
       def create
-        render :json => 'not yet implemented'.to_json, status: 501
+        course_id = params[:course_id]  # course_id from the URL
+        lms_id = params[:lms_id]      # lms_id from the body
+        external_course_id = params[:external_course_id]  # external_course_id from the body
+
+        # Ensure the course exists
+        unless Course.exists?(course_id)
+          render json: { error: 'Course not found' }, status: :not_found
+          return
+        end
+
+        # Ensure the lms exists
+        unless Lms.exists?(lms_id)
+          render json: { error: 'Lms not found' }, status: :not_found
+          return
+        end
+
+        # Check if the entry already exists
+        existing_entry = CourseToLms.find_by(course_id: course_id, lms_id: lms_id, external_course_id: external_course_id)
+        if existing_entry
+          render json: { message: 'The association between the specified course and LMS already exists.' }, status: :ok
+          return
+        end
+
+        # Create the course_to_lms entry
+        course_to_lms = CourseToLms.new(
+          course_id: course_id,
+          lms_id: lms_id,
+          external_course_id: external_course_id
+        )
+
+        if course_to_lms.save
+          render json: course_to_lms, status: :created
+        else
+          render json: course_to_lms.errors, status: :unprocessable_entity
+        end
       end
 
       def index
@@ -20,9 +55,9 @@ def destroy
       # TODO: this should be exported to its own (validator) class.
       # TODO: this validation should also check the config file for the name of lms's.
       #
-      def validate_name!
-        if params['name'].blank?
-          render :json => 'name parameter is required', status: 401
+      def validate_ids!
+        if params[:course_id].blank? || params[:lms_id].blank? || params[:external_course_id].blank?
+          render json: { error: 'course_id and lms_id are required' }, status: :bad_request
         end
       end
     end

app/models/course.rb

@@ -0,0 +1,6 @@
+# app/models/course.rb
+
+class Course < ApplicationRecord
+
+
+end

app/models/course_to_lms.rb

@@ -0,0 +1,11 @@
+# app/models/course_to_lms.rb
+class CourseToLms < ApplicationRecord
+    # Association with Course and Lms
+    belongs_to :course
+    belongs_to :lms
+
+    # You can add validations here if needed, for example:
+    validates :course_id, presence: true
+    validates :lms_id, presence: true
+  end
+

app/models/lms.rb

@@ -0,0 +1,5 @@
+# app/models/lms.rb
+class Lms < ApplicationRecord
+
+
+end

spec/controllers/api/v1/lmss_controller_spec.rb

@@ -2,26 +2,71 @@
 module Api
   module V1
     describe LmssController do
-      let(:mock_course_id) { 16 }
-      let(:mock_course_name) { 'testCourseName' }
-      describe 'create' do
-        it 'throws a 501 error' do
-          post :create, params: {
-            course_id: :mock_course_id,
-            name: :mock_course_name,
-          }
-          expect(response.status).to eq(501)
+      def json_response
+        JSON.parse(response.body)
+      end
+
+      before do
+        # Manually create a course and LMS in the database
+        @course = Course.create!(course_name: "Mock CS169 Course")
+        @lms = Lms.create!(lms_name: "Mock Canvas", use_auth_token: true)
+        @external_course_id = "mock_external_course_id"
+      end
+
+      after do
+        # Clean up the specifically created data
+        CourseToLms.delete_all
+        Course.delete_all
+        Lms.delete_all
+      end
+
+      describe 'POST #create' do
+        context 'when valid parameters are provided' do
+          it 'creates a new course_to_lms association and returns status :created' do
+            post :create, params: { course_id: @course.id, lms_id: @lms.id, external_course_id: @external_course_id}
+            expect(response).to have_http_status(:created)
+            expect(json_response['course_id']).to eq(@course.id)
+            expect(json_response['lms_id']).to eq(@lms.id)
+          end
         end
 
-        it 'throws a 401 error if the name is not specified' do
-          post :create, params: {
-            course_id: :mock_course_id,
-          }
-          expect(response.status).to eq(401)
-          expect(response.body).to eq('name parameter is required')
+
+        context 'when lms_id is missing' do
+          it 'returns status :bad_request' do
+            post :create, params: { course_id: @course.id, external_course_id: @external_course_id}
+            expect(response).to have_http_status(:bad_request)
+            expect(response.body).to include('course_id and lms_id are required')
+          end
+        end
+
+        context 'when course does not exist' do
+          it 'returns status :not_found' do
+            post :create, params: { course_id: -1, lms_id: @lms.id, external_course_id: @external_course_id}
+            expect(response).to have_http_status(:not_found)
+            expect(response.body).to include('Course not found')
+          end
+        end
+
+        context 'when lms does not exist' do
+          it 'returns status :not_found' do
+            post :create, params: { course_id: @course.id, lms_id: -1, external_course_id: @external_course_id}
+            expect(response).to have_http_status(:not_found)
+            expect(response.body).to include('Lms not found')
+          end
+        end
+
+        context 'when the association already exists' do
+          it 'returns status :ok' do
+            CourseToLms.create!(course_id: @course.id, lms_id: @lms.id, external_course_id: @external_course_id)
+            post :create, params: { course_id: @course.id, lms_id: @lms.id, external_course_id: @external_course_id}
+            expect(response).to have_http_status(:ok)
+            expect(response.body).to include('The association between the specified course and LMS already exists.')
+          end
         end
       end
 
+
+
       describe 'index' do
         it 'throws a 501 error' do
           get :index, params: { course_id: :mock_course_id }