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Showing content from https://github.com/reduxjs/redux/issues/1165 below:

Question: Where to put business logic

I'm right now learning Redux. So, I'm looking for some places where we can put business logic and validations.

It's a simple counter. And the counter value must be sit between 1-5. I has no idea on where to put my app's business logic. So, this is what I did.

When there is no server side async stuff, I put my validations inside the reducer like this.
See: https://github.com/arunoda/learn-redux/blob/dir-structure/src/reducers/index.js#L6
It worked pretty well.

When I need to sync the store with the server, I used redux-thunk. Now I had to validate in the action creators as well. So, instead of validating in the reducers, I moved validation logic into the action creators. See: https://goo.gl/VC8lmp

So, I think it's best to put validation/business logic into action creators, specially with redux-thunk. (where I can get the store state easily). Is this the pattern used normally, or is there any better approaches?

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