Class: GraphQL::Schema::Argument

Inherits:
Object
  • Object
show all
Includes:
Member::AcceptsDefinition, Member::CachedGraphQLDefinition, Member::HasAstNode, Member::HasPath
Defined in:
lib/graphql/schema/argument.rb

Constant Summary collapse

NO_DEFAULT = 
:__no_default__

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Member::HasAstNode

#ast_node

Methods included from Member::HasPath

#path

Methods included from Member::CachedGraphQLDefinition

#graphql_definition, #initialize_copy, #type_class

Constructor Details

#initialize(arg_name = nil, type_expr = nil, desc = nil, required:, type: nil, name: nil, loads: nil, description: nil, ast_node: nil, default_value: NO_DEFAULT, as: nil, from_resolver: false, camelize: true, prepare: nil, method_access: true, owner:, &definition_block) ⇒ Argument

Returns a new instance of Argument.

Parameters:

  • arg_name (Symbol) (defaults to: nil)
  • type_expr (defaults to: nil)
  • desc (String) (defaults to: nil)
  • required (Boolean) —

    if true, this argument is non-null; if false, this argument is nullable

  • description (String) (defaults to: nil)
  • default_value (Object) (defaults to: NO_DEFAULT)
  • as (Symbol) (defaults to: nil) —

    Override the keyword name when passed to a method

  • prepare (Symbol) (defaults to: nil) —

    A method to call to transform this argument’s valuebefore sending it to field resolution

  • camelize (Boolean) (defaults to: true) —

    if true, the name will be camelized when building the schema

  • from_resolver (Boolean) (defaults to: false) —

    if true, a Resolver class defined this argument

  • method_access (Boolean) (defaults to: true) —

    If false, don’t build method access on legacy Query::Arguments instances.



48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
 
# File 'lib/graphql/schema/argument.rb', line 48

def initialize(arg_name = nil, type_expr = nil, desc = nil, required:, type: nil, name: nil, loads: nil, description: nil, ast_node: nil, default_value: NO_DEFAULT, as: nil, from_resolver: false, camelize: true, prepare: nil, method_access: true, owner:, &definition_block)
  arg_name ||= name
  @name = -(camelize ? Member::BuildType.camelize(arg_name.to_s) : arg_name.to_s)
  @type_expr = type_expr || type
  @description = desc || description
  @null = !required
  @default_value = default_value
  @owner = owner
  @as = as
  @loads = loads
  @keyword = as || (arg_name.is_a?(Symbol) ? arg_name : Schema::Member::BuildType.underscore(@name).to_sym)
  @prepare = prepare
  @ast_node = ast_node
  @from_resolver = from_resolver
  @method_access = method_access

  if definition_block
    if definition_block.arity == 1
      instance_exec(self, &definition_block)
    else
      instance_eval(&definition_block)
    end
  end
end

Instance Attribute Details

#default_value ⇒ Object (readonly)

Returns the value used when the client doesn’t provide a value for this argument.

Returns:

  • (Object) —

    the value used when the client doesn’t provide a value for this argument



74
75
76
 
# File 'lib/graphql/schema/argument.rb', line 74

def default_value
  @default_value
end

#description(text = nil) ⇒ String

Returns Documentation for this argument.

Returns:

  • (String) —

    Documentation for this argument



84
85
86
87
88
89
90
 
# File 'lib/graphql/schema/argument.rb', line 84

def description(text = nil)
  if text
    @description = text
  else
    @description
  end
end

#keyword ⇒ Symbol (readonly)

Returns This argument’s name in Ruby keyword arguments.

Returns:

  • (Symbol) —

    This argument’s name in Ruby keyword arguments



27
28
29
 
# File 'lib/graphql/schema/argument.rb', line 27

def keyword
  @keyword
end

#loads ⇒ Class, ... (readonly)

Returns If this argument should load an application object, this is the type of object to load.

Returns:

  • (Class, Module, nil) —

    If this argument should load an application object, this is the type of object to load



30
31
32
 
# File 'lib/graphql/schema/argument.rb', line 30

def loads
  @loads
end

#name ⇒ String (readonly) Also known as: graphql_name

Returns the GraphQL name for this argument, camelized unless camelize: false is provided.

Returns:

  • (String) —

    the GraphQL name for this argument, camelized unless camelize: false is provided



17
18
19
 
# File 'lib/graphql/schema/argument.rb', line 17

def name
  @name
end

#owner ⇒ GraphQL::Schema::Field, Class (readonly)

Returns The field or input object this argument belongs to.

Returns:



21
22
23
 
# File 'lib/graphql/schema/argument.rb', line 21

def owner
  @owner
end

#prepare ⇒ Symbol (readonly)

Returns A method to call to transform this value before sending it to field resolution method.

Returns:

  • (Symbol) —

    A method to call to transform this value before sending it to field resolution method



24
25
26
 
# File 'lib/graphql/schema/argument.rb', line 24

def prepare
  @prepare
end

#type ⇒ Object 



151
152
153
154
155
 
# File 'lib/graphql/schema/argument.rb', line 151

def type
  @type ||= Member::BuildType.parse_type(@type_expr, null: @null)
rescue StandardError => err
  raise ArgumentError, "Couldn't build type for Argument #{@owner.name}.#{name}: #{err.class.name}: #{err.message}", err.backtrace
end

Instance Method Details

#accessible?(context) ⇒ Boolean

Returns:

  • (Boolean) 


96
97
98
 
# File 'lib/graphql/schema/argument.rb', line 96

def accessible?(context)
  true
end

#authorized?(obj, value, ctx) ⇒ Boolean

Returns:

  • (Boolean) 


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

def authorized?(obj, value, ctx)
  authorized_as_type?(obj, value, ctx, as_type: type)
end

#authorized_as_type?(obj, value, ctx, as_type:) ⇒ Boolean

Returns:

  • (Boolean) 


104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
 
# File 'lib/graphql/schema/argument.rb', line 104

def authorized_as_type?(obj, value, ctx, as_type:)
  if value.nil?
    return true
  end

  if as_type.kind.non_null?
    as_type = as_type.of_type
  end

  if as_type.kind.list?
    value.each do |v|
      if !authorized_as_type?(obj, v, ctx, as_type: as_type.of_type)
        return false
      end
    end
  elsif as_type.kind.input_object?
    as_type.arguments.each do |_name, input_obj_arg|
      input_obj_arg = input_obj_arg.type_class
      # TODO: this skips input objects whose values were alread replaced with application objects.
      # See: https://github.com/rmosolgo/graphql-ruby/issues/2633
      if value.respond_to?(:key?) && value.key?(input_obj_arg.keyword) && !input_obj_arg.authorized?(obj, value[input_obj_arg.keyword], ctx)
        return false
      end
    end
  end
  # None of the early-return conditions were activated,
  # so this is authorized.
  true
end

#default_value? ⇒ Boolean

Returns True if this argument has a default value.

Returns:

  • (Boolean) —

    True if this argument has a default value



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

def default_value?
  @default_value != NO_DEFAULT
end

#from_resolver? ⇒ Boolean

Returns true if a resolver defined this argument.

Returns:

  • (Boolean) —

    true if a resolver defined this argument



33
34
35
 
# File 'lib/graphql/schema/argument.rb', line 33

def from_resolver?
  @from_resolver
end

#prepare_value(obj, value, context: nil) ⇒ 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.

Apply the #prepare configuration to value, using methods from obj. Used by the runtime.



166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
 
# File 'lib/graphql/schema/argument.rb', line 166

def prepare_value(obj, value, context: nil)
  if value.is_a?(GraphQL::Schema::InputObject)
    value = value.prepare
  end

  if @prepare.nil?
    value
  elsif @prepare.is_a?(String) || @prepare.is_a?(Symbol)
    if obj.nil?
      # The problem here is, we _used to_ prepare while building variables.
      # But now we don't have the runtime object there.
      #
      # This will have to be called later, when the runtime object _is_ available.
      value
    else
      obj.public_send(@prepare, value)
    end
  elsif @prepare.respond_to?(:call)
    @prepare.call(value, context || obj.context)
  else
    raise "Invalid prepare for #{@owner.name}.name: #{@prepare.inspect}"
  end
end

#statically_coercible? ⇒ Boolean

Returns:

  • (Boolean) 


157
158
159
160
161
 
# File 'lib/graphql/schema/argument.rb', line 157

def statically_coercible?
  return @statically_coercible if defined?(@statically_coercible)

  @statically_coercible = !@prepare.is_a?(String) && !@prepare.is_a?(Symbol)
end

#to_graphql ⇒ Object 



134
135
136
137
138
139
140
141
142
143
144
145
146
147
 
# File 'lib/graphql/schema/argument.rb', line 134

def to_graphql
  argument = GraphQL::Argument.new
  argument.name = @name
  argument.type = -> { type }
  argument.description = @description
  argument.metadata[:type_class] = self
  argument.as = @as
  argument.ast_node = ast_node
  argument.method_access = @method_access
  if NO_DEFAULT != @default_value
    argument.default_value = @default_value
  end
  argument
end

#visible?(context) ⇒ Boolean

Returns:

  • (Boolean) 


92
93
94
 
# File 'lib/graphql/schema/argument.rb', line 92

def visible?(context)
  true
end