Update nested struct with Ecto

Questions & Help Questions
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4

Yes this was what I was referring to. That means there are existing associations you have not included in your payload. After the first execution there are two files that were assigned IDs. You need to include those in your next params:

params = %{
  files: [
    %{id: file1.id},
    %{id: file2.id},
    %{filename: "name3"},
    %{filename: "name4"} 
  ]
}