I'm trying to have a common flow for validating inputs. For example how and where to validate that a todo in the :add-todo event is valid.
At first, I thought that it's the component dispatching the event which is responsible for validating the input. Obviously, at some point, I wanted to validate a todo in an other component. I had to create a valid-todo? function that any component could use. That's fine but then of course, I forgot to validate one and had a bug in my app because I was dispatching and storing an invalid todo. So I thought it make sense to validate the input in the handler. I can make a middleware that check if the todo is valid. Now I'm sure that nobody can store an invalid todo. Since all the model functions (subs, handlers and validators) are collocated, it allow me to easily refactor the schema without forgetting anything. At this point, I have two kind of invalid input. The exceptionally invalid input which is only possible if my app has bug and the user invalid input that should trigger some feedback. For the first one, I simply have some assert on the handler so I don't miss that kind of errors. It's not nice in prod but that's in progress https://github.com/Day8/re-frame/issues/54 For the invalid user input, I'm experimenting with this flow : Components that could trigger some invalid input get an id into the error map of the global state. (error (subscribe [:error :todo-form]) When I dispatch the :add-todo, I add the component id to the params vector (dispatch [:add-todo todo-data :todo-form]) Then, in the handler or in a middleware if that make sense, I can : (if (valid-todo? todo) (update-in db [:todos] conj todo) (update-in db [:error error-id] "Todo cannot be empty")) I then just render my component based on the @error subscription So how do you guys do it ? -- Note that posts from new members are moderated - please be patient with your first post. --- You received this message because you are subscribed to the Google Groups "ClojureScript" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/clojurescript.
