Gracefully rescue_from CeleryScript::TypeCheckError

app/controllers/api/abstract_controller.rb

@@ -1,3 +1,5 @@
+require "./app/lib/celery_script/checker"
+
 module Api
   # A controller that contains all of the helper methods and shared logic for
   # all API endpoints.
@@ -16,6 +18,10 @@ module Api
     skip_before_action :verify_authenticity_token
     after_action :skip_set_cookies_header
 
+    rescue_from(CeleryScript::TypeCheckError) do |err|
+      sorry err.message, 422
+    end
+
     rescue_from(ActionController::RoutingError) { sorry "Not found", 404 }
     rescue_from(User::AlreadyVerified) { sorry "Already verified.", 409 }
 

spec/controllers/api/regimens/regimens_create_spec.rb

@@ -59,5 +59,29 @@ describe Api::RegimensController do
       expect(json[:name]).to eq(name)
       expect(json[:color]).to eq(color)
     end
+
+    it "handles CeleryScript::TypeCheckError" do
+      sign_in user
+      s       = FakeSequence.with_parameters
+      payload = { device: s.device,
+                  name:   "specs",
+                  color:  "red",
+                  body: [
+                    {
+                      kind: "variable_declaration",
+                      args: {
+                        label: "parent",
+                        data_value: { kind: "nothing", args: { } }
+                      }
+                    }
+                  ],
+                  regimen_items: [
+                    { time_offset: 100, sequence_id: s.id }
+                  ] }
+      post :create, body: payload.to_json, format: :json
+      expect(response.status).to eq(422)
+      expect(json.fetch(:error))
+        .to include("must provide a value for all parameters")
+    end
   end
 end