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query_builder

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Compose Ecto queries without effort

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query_builder lib query distinct_roots.ex
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lib/query/distinct_roots.ex 

defmodule QueryBuilder.Query.DistinctRoots do

  @moduledoc false



  def distinct_roots(ecto_query, assoc_list) do

    root_schema = assoc_list.root_schema

    primary_key_fields = root_schema.__schema__(:primary_key)



    if primary_key_fields == [] do

      raise ArgumentError,

            "distinct_roots/1 requires the root schema to have a primary key so it can dedupe roots; " <>

              "got schema with no primary key: #{inspect(root_schema)}"

    end



    QueryBuilder.Query.Distinct.distinct(

      ecto_query,

      assoc_list,

      primary_key_fields

    )

  end

end