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This PR changes how `NULL FIRST` and `NULL LAST` is implemented for Postgresql and also allows it to be used by other DB's. Instead of using SQL fragments, it uses...

Eager load incorrectly sets 'through' associations on child objects

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### Steps to reproduce Run in terminal ```sh rails new nested_assoc && cd nested_assoc && rails g model Company name && \ rails g model Person company:belongs_to && rails g...

Old link no longer exists. Updated link to new docs on setting up JS client.