Class: GraphQL::Query::Variables

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/graphql/query/variables.rb

Overview

Read-only access to query variables, applying default values if needed.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ctx, ast_variables, provided_variables) ⇒ Variables

Returns a new instance of Variables.



13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
 
# File 'lib/graphql/query/variables.rb', line 13

def initialize(ctx, ast_variables, provided_variables)
  schema = ctx.schema
  @context = ctx

  @provided_variables = deep_stringify(provided_variables)
  @errors = []
  @storage = ast_variables.each_with_object({}) do |ast_variable, memo|
    if schema.validate_max_errors && schema.validate_max_errors <= @errors.count
      add_max_errors_reached_message
      break
    end
    # Find the right value for this variable:
    # - First, use the value provided at runtime
    # - Then, fall back to the default value from the query string
    # If it's still nil, raise an error if it's required.
    variable_type = schema.type_from_ast(ast_variable.type, context: ctx)
    if variable_type.nil?
      # Pass -- it will get handled by a validator
    else
      variable_name = ast_variable.name
      default_value = ast_variable.default_value
      provided_value = @provided_variables[variable_name]
      value_was_provided =  @provided_variables.key?(variable_name)
      max_errors = schema.validate_max_errors - @errors.count if schema.validate_max_errors
      begin
        validation_result = variable_type.validate_input(provided_value, ctx, max_errors: max_errors)
        if validation_result.valid?
          if value_was_provided
            # Add the variable if a value was provided
            memo[variable_name] = provided_value
          elsif default_value != nil
            memo[variable_name] = if default_value.is_a?(Language::Nodes::NullValue)
              nil
            else
              default_value
            end
          end
        end
      rescue GraphQL::ExecutionError => ex
        # TODO: This should really include the path to the problematic node in the variable value
        # like InputValidationResults generated by validate_non_null_input but unfortunately we don't
        # have this information available in the coerce_input call chain. Note this path is the path
        # that appears under errors.extensions.problems.path and NOT the result path under errors.path.
        validation_result = GraphQL::Query::InputValidationResult.from_problem(ex.message)
      end

      if !validation_result.valid?
        @errors << GraphQL::Query::VariableValidationError.new(ast_variable, variable_type, provided_value, validation_result)
      end
    end
  end
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



11
12
13
 
# File 'lib/graphql/query/variables.rb', line 11

def context
  @context
end

#errors ⇒ Array<GraphQL::Query::VariableValidationError> (readonly)

Returns Any errors encountered when parsing the provided variables and literal values.

Returns:



9
10
11
 
# File 'lib/graphql/query/variables.rb', line 9

def errors
  @errors
end