Implement single route selection

test/Feature/QuerySpec.hs

@@ -214,6 +214,24 @@ spec =
       get "/users_tasks?user_id=eq.2&task_id=eq.6&select=*, comments(content)" `shouldRespondWith`
         "[{\"user_id\":2,\"task_id\":6,\"comments\":[{\"content\":\"Needs to be delivered ASAP\"}]}]"
 
+  describe "Plurality singular" $ do
+    it "will select an existing object" $
+      request methodGet "/items?id=eq.5" [("Prefer","plurality=singular")] ""
+        `shouldRespondWith` ResponseMatcher {
+          matchBody    = Just [json| {"id":5} |]
+        , matchStatus  = 200
+        , matchHeaders = []
+        }
+
+    it "will respond with 404 when not found" $
+      request methodGet "/items?id=eq.9999" [("Prefer","plurality=singular")] ""
+        `shouldRespondWith` 404
+
+    it "can shape plurality singular object routes" $
+      request methodGet "/projects_view?id=eq.1&select=id,name,clients(*),tasks(id,name)" [("Prefer","plurality=singular")] ""
+        `shouldRespondWith`
+          "{\"id\":1,\"name\":\"Windows 7\",\"clients\":{\"id\":1,\"name\":\"Microsoft\"},\"tasks\":[{\"id\":1,\"name\":\"Design w7\"},{\"id\":2,\"name\":\"Code w7\"}]}"
+
 
   describe "ordering response" $ do
     it "by a column asc" $