Can anybody point to me where this IN is documented in ecto? I cannot find, and it took me so long to find this post 
alexandre
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peerreynders
though you’re possibly talking about from p in Post
In general the in expression is looking for an Ecto.Queryable on the right hand side - if it’s a string it is referring to a DB table. The Ecto.Queryable is usually a module that uses Ecto.Schema
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