Class: GraphQL::Argument

Inherits:
Object
  • Object
show all
Includes:
Define::InstanceDefinable
Defined in:
lib/graphql/argument.rb

Overview

Used for defined arguments (Field, InputObjectType)

#name must be a String.

Examples:

defining an argument for a field

GraphQL::Field.define do
  # ...
  argument :favoriteFood, types.String, "Favorite thing to eat", default_value: "pizza"
end

defining an argument for an InputObjectType

GraphQL::InputObjectType.define do
  argument :newName, !types.String
end

defining an argument with a prepare function

GraphQL::Field.define do
  argument :userId, types.ID, prepare: ->(userId) do
    User.find_by(id: userId)
  end
end

returning an ExecutionError from a prepare function

GraphQL::Field.define do
  argument :date do
    type !types.String
    prepare ->(date) do
      return GraphQL::ExecutionError.new("Invalid date format") unless DateValidator.valid?(date)
      Time.zone.parse(date)
    end
  end
end

Defined Under Namespace

Modules: DefaultPrepare

Constant Summary

NO_DEFAULT_VALUE =
Object.new

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Define::InstanceDefinable

#define, #metadata, #redefine

Constructor Details

#initializeArgument

Returns a new instance of Argument



51
52
53
# File 'lib/graphql/argument.rb', line 51

def initialize
  @prepare_proc = DefaultPrepare
end

Instance Attribute Details

#asObject

Returns the value of attribute as



40
41
42
# File 'lib/graphql/argument.rb', line 40

def as
  @as
end

#ast_nodeObject

Returns the value of attribute ast_node



41
42
43
# File 'lib/graphql/argument.rb', line 41

def ast_node
  @ast_node
end

#default_valueObject

Returns the value of attribute default_value



39
40
41
# File 'lib/graphql/argument.rb', line 39

def default_value
  @default_value
end

#descriptionObject

Returns the value of attribute description



40
41
42
# File 'lib/graphql/argument.rb', line 40

def description
  @description
end

#nameString Also known as: graphql_name

Returns The name of this argument on its Field or InputObjectType

Returns:



73
74
75
# File 'lib/graphql/argument.rb', line 73

def name
  @name
end

Class Method Details

.deep_stringify(val) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.



138
139
140
141
142
143
144
145
146
147
148
149
150
151
# File 'lib/graphql/argument.rb', line 138

def self.deep_stringify(val)
  case val
  when Array
    val.map { |v| deep_stringify(v) }
  when Hash
    new_val = {}
    val.each do |k, v|
      new_val[k.to_s] = deep_stringify(v)
    end
    new_val
  else
    val
  end
end

.from_dsl(name, type_or_argument = nil, description = nil, default_value: NO_DEFAULT_VALUE, as: nil, prepare: DefaultPrepare, **kwargs, &block) ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.



112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
# File 'lib/graphql/argument.rb', line 112

def self.from_dsl(name, type_or_argument = nil, description = nil, default_value: NO_DEFAULT_VALUE, as: nil, prepare: DefaultPrepare, **kwargs, &block)
  name_s = name.to_s

  # Move some positional args into keywords if they're present
  description && kwargs[:description] ||= description
  kwargs[:name] ||= name_s
  kwargs[:default_value] ||= default_value
  kwargs[:as] ||= as

  unless prepare == DefaultPrepare
    kwargs[:prepare] ||= prepare
  end

  if !type_or_argument.nil? && !type_or_argument.is_a?(GraphQL::Argument)
    # Maybe a string, proc or BaseType
    kwargs[:type] = type_or_argument
  end

  if type_or_argument.is_a?(GraphQL::Argument)
    type_or_argument.redefine(kwargs, &block)
  else
    GraphQL::Argument.define(kwargs, &block)
  end
end

Instance Method Details

#default_value?Boolean

Returns:

  • (Boolean)


59
60
61
# File 'lib/graphql/argument.rb', line 59

def default_value?
  !!@has_default_value
end

#expose_asString

Returns The name of this argument inside resolve functions

Returns:

  • (String)

    The name of this argument inside resolve functions



88
89
90
# File 'lib/graphql/argument.rb', line 88

def expose_as
  @expose_as ||= (@as || @name).to_s
end

#initialize_copy(other) ⇒ Object



55
56
57
# File 'lib/graphql/argument.rb', line 55

def initialize_copy(other)
  @expose_as = nil
end

#keywordObject

Backport this to support legacy-style directives



93
94
95
# File 'lib/graphql/argument.rb', line 93

def keyword
  @keyword ||= GraphQL::Schema::Member::BuildType.underscore(expose_as).to_sym
end

#prepare(value, ctx) ⇒ Object

Returns The prepared value for this argument or value itself if no prepare function exists.

Parameters:

Returns:

  • (Object)

    The prepared value for this argument or value itself if no prepare function exists.



100
101
102
# File 'lib/graphql/argument.rb', line 100

def prepare(value, ctx)
  @prepare_proc.call(value, ctx)
end

#prepare=(prepare_proc) ⇒ Object

Assign a prepare function to prepare this argument’s value before resolve functions are called.

Parameters:

  • prepare_proc (#<call(value, ctx))

    ]



106
107
108
# File 'lib/graphql/argument.rb', line 106

def prepare=(prepare_proc)
  @prepare_proc = BackwardsCompatibility.wrap_arity(prepare_proc, from: 1, to: 2, name: "Argument#prepare(value, ctx)")
end

#typeGraphQL::BaseType

Returns the input type for this argument

Returns:



83
84
85
# File 'lib/graphql/argument.rb', line 83

def type
  @clean_type ||= GraphQL::BaseType.resolve_related_type(@dirty_type)
end

#type=(new_input_type) ⇒ Object

Parameters:

  • new_input_type (GraphQL::BaseType, Proc)

    Assign a new input type for this argument (if it’s a proc, it will be called after schema initialization)



77
78
79
80
# File 'lib/graphql/argument.rb', line 77

def type=(new_input_type)
  @clean_type = nil
  @dirty_type = new_input_type
end