I could picture handling that kind of thing several different ways. First, the UI may want to prevent the user from being able to hit "Add" or something if a w

I could picture handling that kind of thing several different ways. First, the UI may want to prevent the user from being able to hit "Add" or something if a workout already exists for that day. The component could use a selector to determine if there's an existing workout, return the flag in `mapState`, and disable buttons or forms appropriately. Second, the action creation logic could decide to not actually dispatch an `ADD_WORKOUT` action by inspecting the current state and only dispatching the action if allowed. (I have some relevant examples of redux-thunk use cases like this at [0]). Third, the action could get always dispatched, but the reducer could make the decision whether to actually insert the proposed workout into state. Regarding the side effects, this is a good use case for "sagas". Dispatch an `ADD_WORKOUT` action that triggers a saga, but is ignored by the reducers. The root saga kicks off a child saga when it sees that action. The workout saga could then decide whether it needs to actually add the workout based on state, dispatch another action that actually updates the state, make the AJAX call for weather and persist it to the server, and trigger a push notification. (You can do same thing in a thunk, it just would need explicit promise usage rather than the synchronous-looking code of a generator-based saga.) Lastly, this isn't a direct answer to your question, but you may be interested in some of the more in-depth Redux tutorials I've collected. They're in the 'Redux Tutorials#Project-Based Tutorials" section of my links list [1]. In particular, I recommend "Building a Simple CRUD App with Redux" [2], and my own "Practical Redux" series [3]. Hopefully this gives you some ideas. I'd also invite you to come ask questions in the Reactiflux chat channels on Discord. The invite link is at https://www.reactiflux.com https://www.reactiflux.com . Great place to hang out, learn, and discuss React + related topics. [0] https://gist.github.com/markerikson/ea4d0a6ce56ee479fe8b356e099f857e https://gist.github.com/markerikson/ea4d0a6ce56ee479fe8b356e... [1] https://github.com/markerikson/react-redux-links/blob/master/redux-tutorials.md#project-based-tutorials https://github.com/markerikson/react-redux-links/blob/master... [2] http://www.thegreatcodeadventure.com/building-a-simple-crud-app-with-react-redux-part-1/ http://www.thegreatcodeadventure.com/building-a-simple-crud-... [3] http://blog.isquaredsoftware.com/series/practical-redux/ http://blog.isquaredsoftware.com/series/practical-redux/