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GraphQL for Elixir
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lib/absinthe/phase/document/variables.ex
defmodule Absinthe.Phase.Document.Variables do
@moduledoc false
# Provided a set of variable values:
#
# - Set the `variables` field on the `Blueprint.Document.Operation.t` to the reconciled
# mapping of variable values, supporting defined default values.
#
# ## Examples
#
# Given a GraphQL document that looks like:
#
# ```graphql
# query Item($id: ID!, $text = String = "Another") {
# item(id: $id, category: "Things") {
# name
# }
# }
# ```
#
# And this phase configuration:
#
# ```
# run(blueprint, %{"id" => "1234"})
# ``
#
# - The operation's `variables` field would have an `"id"` value set to
# `%Blueprint.Input.String{value: "1234"}`
# - The operation's `variables` field would have an `"text"` value set to
# `%Blueprint.Input.String{value: "Another"}`
#
# ```
# run(blueprint, %{})
# ```
#
# - The operation's `variables` field would have an `"id"` value set to
# `nil`
# - The operation's `variables` field would have an `"text"` value set to
# `%Blueprint.Input.String{value: "Another"}`
#
# Note that no validation occurs in this phase.
use Absinthe.Phase
alias Absinthe.Blueprint
@spec run(Blueprint.t(), Keyword.t()) :: {:ok, Blueprint.t()}
def run(input, options \\ []) do
variables = options[:variables] || %{}
{:ok, update_operations(input, variables)}
end
def update_operations(input, variables) do
operations =
for op <- input.operations do
update_operation(op, variables)
end
%{input | operations: operations}
end
def update_operation(%{variable_definitions: variable_definitions} = operation, variables) do
{variable_definitions, provided_values} =
Enum.map_reduce(variable_definitions, %{}, fn node, acc ->
provided_value = calculate_value(node, variables)
{
%{node | provided_value: provided_value},
Map.put(acc, node.name, provided_value)
}
end)
%{operation | variable_definitions: variable_definitions, provided_values: provided_values}
end
defp calculate_value(node, variables) do
case Map.fetch(variables, node.name) do
:error ->
node.default_value
{:ok, value} ->
value
|> preparse_nil
|> Blueprint.Input.parse()
end
end
defp preparse_nil(nil), do: %Blueprint.Input.Null{}
defp preparse_nil(other), do: other
end