cast_parameters.ex
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cast_parameters.ex
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	defmodule OpenApiSpex.CastParameters do
	@moduledoc false
	alias OpenApiSpex.{Cast, Operation, Parameter, Schema}
	alias OpenApiSpex.Cast.{Error, Object}
	alias Plug.Conn

	@spec cast(Plug.Conn.t(), Operation.t(), Schema.schemas()) ::
	{:error, [Error.t()]} \| {:ok, Conn.t()}
	def cast(conn, operation, schemas) do
	# Taken together as a set, operation parameters are similar to an object schema type.
	# Convert parameters to an object schema, then delegate to `Cast.Object.cast/1`

	properties =
	operation.parameters
	\|> Enum.map(fn parameter -> {parameter.name, Parameter.schema(parameter)} end)
	\|> Map.new()

	required =
	operation.parameters
	\|> Enum.filter(& &1.required)
	\|> Enum.map(& &1.name)

	object_schema = %Schema{
	type: :object,
	properties: properties,
	required: required
	}

	params = Map.merge(conn.path_params, conn.query_params)

	ctx = %Cast{value: params, schema: object_schema, schemas: schemas}

	with {:ok, params} <- Object.cast(ctx) do
	{:ok, %{conn \| params: params}}
	end
	end
	end