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ex_open_api_utils

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Elixir utilities for OpenAPI 3.1 schema generation from Ecto schemas

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ex_open_api_utils lib ex_open_api_utils jason_encoder.ex
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lib/ex_open_api_utils/jason_encoder.ex 

defmodule ExOpenApiUtils.JasonEncoder do

  @moduledoc false



  # Builds a `defimpl Jason.Encoder` AST for a generated schema module.

  #

  # The generated encoder does an inline `Enum.reduce` over `property_attrs`,

  # applying nil-stripping via `Mapper.Utils.nil_aware_put/4`, and passes the

  # result to `Jason.Encode.map/2`. Nested struct values stay as structs —

  # `Jason.Encode.map` dispatches to their own Jason.Encoder impls lazily.

  def build_ast(property_attrs) do

    quote do

      if Code.ensure_loaded?(Jason.Encoder) do

        defimpl Jason.Encoder, for: __MODULE__ do

          def encode(struct, opts) do

            result =

              Enum.reduce(

                unquote(Macro.escape(property_attrs)),

                %{},

                fn %ExOpenApiUtils.Property{} = property, acc ->

                  val = Map.get(struct, property.key)



                  ExOpenApiUtils.Mapper.Utils.nil_aware_put(

                    acc,

                    Atom.to_string(property.key),

                    val,

                    property.schema

                  )

                end

              )



            Jason.Encode.map(result, opts)

          end

        end

      end

    end

  end

end