Add endpoint to create an artwork

app/controllers/api/using_nothing/artworks_controller.rb

@@ -10,6 +10,22 @@ def show
         artwork = Artwork.find(params[:id])
         render json: artwork
       end
+
+      def create
+        artwork = Artwork.new(artwork_params)
+        if artwork.save
+          render json: artwork, status: :created
+        else
+          errors = {errors: artwork.errors.full_messages.to_sentence}
+          render json: errors, status: :bad_request
+        end
+      end
+
+      private
+
+      def artwork_params
+        params.permit(:amount_cents, :artist_name, :medium, :title)
+      end
     end
   end
 end

app/models/artwork.rb

@@ -1,2 +1,6 @@
 class Artwork < ApplicationRecord
+  validates :amount_cents, presence: true
+  validates :artist_name, presence: true
+  validates :medium, presence: true
+  validates :title, presence: true
 end

spec/requests/using_nothing/create_artwork_spec.rb

@@ -0,0 +1,26 @@
+require "rails_helper"
+
+describe "POST /api/using_nothing/artworks" do
+  context "without required params" do
+    it "returns a 400 and the errors" do
+      params = {}
+      post "/api/using_nothing/artworks", params: params
+      expect(response.status).to eq 400
+    end
+  end
+
+  context "with required params" do
+    it "returns a 201 and the new artwork" do
+      params = {
+        amount_cents: 100_000,
+        artist_name: "Sally Sculptor",
+        medium: "Clay",
+        title: "Fancy cup"
+      }
+      post "/api/using_nothing/artworks", params: params
+      expect(response.status).to eq 201
+      artwork = Artwork.last
+      expect(response.parsed_body).to eq artwork.as_json
+    end
+  end
+end

spec/requests/using_nothing/list_artworks_spec.rb

@@ -1,6 +1,6 @@
 require "rails_helper"
 
-describe "/api/using_nothing/artworks" do
+describe "GET /api/using_nothing/artworks" do
   context "without any artworks" do
     it "returns an empty array" do
       get "/api/using_nothing/artworks"

spec/requests/using_nothing/show_artwork_spec.rb

@@ -1,6 +1,6 @@
 require "rails_helper"
 
-describe "/api/using_nothing/artworks/:id" do
+describe "GET /api/using_nothing/artworks/:id" do
   let!(:artwork) { FactoryBot.create(:artwork) }
 
   context "with invalid id" do