Add support for multiple ids per user lookup to reduce number of requests

app/controllers/users_controller.rb

@@ -16,8 +16,9 @@ def lookup
   end
 
   def show
-    user = User.find(params[:id])
-    render json: user
+    ids = params[:id].split(',') if params.key(:id)
+    users = User.where(id: ids || [])
+    render json: users.first if ids.count == 1 else users 
   end
 
   def me

spec/requests/api/users_spec.rb

@@ -655,6 +655,41 @@
     end
   end
 
+  context 'GET /users/:id,:id2,' do
+    context "with mutliple ids" do
+      it "returns the 2 the two users"  do
+        users = create_list(:user, 2)
+        get "#{host}/users/#{users[0].id},#{users[1].id}"
+
+        expect(json.data.first.attributes.state_code).to eq(users[0].state_code)
+        expect(json.data.first.attributes.email).to eq(users[0].email)
+        expect(json.data.first.id).to eq(users[0].id.to_s)
+
+        expect(json.data.last.attributes.state_code).to eq(users.last.state_code)
+        expect(json.data.last.attributes.email).to eq(users.last.email)
+        expect(json.data.last.id).to eq(users.last.id.to_s)
+      end
+
+      it "is successfull response" do
+        users = create_list(:user, 2)
+        get "#{host}/users/#{users[0].id},#{users[1].id}"
+        expect(last_response.status).to eq(200)
+      end
+    end
+
+    context "with no ids specified" do
+      it "returns no results" do
+        get "#{host}/users"
+        expect(json.data).to be_empty
+      end
+
+      it "returns no results" do
+        get "#{host}/users"
+        expect(last_response.status).to eq(200) 
+      end
+    end
+  end
+
   context 'GET /users/:id' do
     email = '[email protected]'
     password = 'password'