Module: GraphQL::Execution::Lookahead::ArgumentHelpers

Defined in:
lib/graphql/execution/lookahead.rb

Overview

TODO Dedup with interpreter

Class Method Summary collapse

Class Method Details

.arg_to_value(query, arg_type, ast_value) ⇒ Array(is_present, value)

Get a Ruby-ready value from a client query.

Parameters:

Returns:

  • (Array(is_present, value)) 


318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
 
# File 'lib/graphql/execution/lookahead.rb', line 318

def arg_to_value(query, arg_type, ast_value)
  if ast_value.is_a?(GraphQL::Language::Nodes::VariableIdentifier)
    # If it's not here, it will get added later
    if query.variables.key?(ast_value.name)
      return true, query.variables[ast_value.name]
    else
      return false, nil
    end
  elsif ast_value.is_a?(GraphQL::Language::Nodes::NullValue)
    return true, nil
  elsif arg_type.is_a?(GraphQL::Schema::NonNull)
    arg_to_value(query, arg_type.of_type, ast_value)
  elsif arg_type.is_a?(GraphQL::Schema::List)
    # Treat a single value like a list
    arg_value = Array(ast_value)
    list = []
    arg_value.map do |inner_v|
      _present, value = arg_to_value(query, arg_type.of_type, inner_v)
      list << value
    end
    return true, list
  elsif arg_type.is_a?(Class) && arg_type < GraphQL::Schema::InputObject
    # For these, `prepare` is applied during `#initialize`.
    # Pass `nil` so it will be skipped in `#arguments`.
    # What a mess.
    args = arguments(query, nil, arg_type, ast_value)
    # We're not tracking defaults_used, but for our purposes
    # we compare the value to the default value.
    return true, arg_type.new(ruby_kwargs: args, context: query.context, defaults_used: nil)
  else
    flat_value = flatten_ast_value(query, ast_value)
    return true, arg_type.coerce_input(flat_value, query.context)
  end
end

.arguments(query, arg_owner, ast_node) ⇒ Object 



293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
 
# File 'lib/graphql/execution/lookahead.rb', line 293

def arguments(query, arg_owner, ast_node)
  kwarg_arguments = {}
  arg_defns = arg_owner.arguments
  ast_node.arguments.each do |arg|
    arg_defn = arg_defns[arg.name] || raise("Invariant: missing argument definition for #{arg.name.inspect} in #{arg_defns.keys} from #{arg_owner}")
    # Need to distinguish between client-provided `nil`
    # and nothing-at-all
    is_present, value = arg_to_value(query, arg_defn.type, arg.value)
    if is_present
      kwarg_arguments[arg_defn.keyword] = value
    end
  end
  arg_defns.each do |name, arg_defn|
    if arg_defn.default_value? && !kwarg_arguments.key?(arg_defn.keyword)
      kwarg_arguments[arg_defn.keyword] = arg_defn.default_value
    end
  end
  kwarg_arguments
end

.flatten_ast_value(query, v) ⇒ Object 



353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
 
# File 'lib/graphql/execution/lookahead.rb', line 353

def flatten_ast_value(query, v)
  case v
  when GraphQL::Language::Nodes::Enum
    v.name
  when GraphQL::Language::Nodes::InputObject
    h = {}
    v.arguments.each do |arg|
      h[arg.name] = flatten_ast_value(query, arg.value)
    end
    h
  when Array
    v.map { |v2| flatten_ast_value(query, v2) }
  when GraphQL::Language::Nodes::VariableIdentifier
    flatten_ast_value(query.variables[v.name])
  else
    v
  end
end