Many to many relationships

[andreo]

What is a proper way to define many to many relationships?

[fzaninotto]

Since admin-on-rest provides no special system for it, you'll have to do it in React. This means querying the first table, then, upon reception of the response, query the second table.

You could easily do it in a componentWillMount(). If you're more adventurous, you could also do it with the Redux state. If you happen to go that far, please open a PR to let us benefit from your solution!

[leesei]

I'm looking into how to use the crudGetMany action. I think a good reference is https://github.com/marmelab/admin-on-rest-demo/blob/master/src/commands/Basket.js

Example:
https://marmelab.com/admin-on-rest-demo/#/commands/550?_k=80befq
This implements the basket on the right hand side where products are fetched with crudGetMany action.

[leesei]

Related: #429

[andreo]

How could an editable oneToMany list be implemented?

There are two actions:

1. Add related item
2. Delete related item

As I understand - a state of the items (new, deleted, unchanged) should be stored in the redux state (oneToMany). Then after "Save" button, the changes "new" and "deleted" are sent to the backend?

We can represetn the relation (A <-> B) as a separate resource (A_B): { a_id: 1, b_id: 3}
Or as an attribute-array.

[fzaninotto]

ReferenceArrayField and ReferenceArrayInput is as far as we'll get for now. I consider it solved.