Class: GraphQL::Query

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Includes:
Tracing::Traceable
Defined in:
lib/graphql/query.rb,
lib/graphql/query/result.rb,
lib/graphql/query/context.rb,
lib/graphql/query/executor.rb,
lib/graphql/query/arguments.rb,
lib/graphql/query/variables.rb,
lib/graphql/query/fingerprint.rb,
lib/graphql/query/null_context.rb,
lib/graphql/query/literal_input.rb,
lib/graphql/query/arguments_cache.rb,
lib/graphql/query/serial_execution.rb,
lib/graphql/query/validation_pipeline.rb,
lib/graphql/query/input_validation_result.rb,
lib/graphql/query/variable_validation_error.rb,
lib/graphql/query/serial_execution/field_resolution.rb,
lib/graphql/query/serial_execution/value_resolution.rb,
lib/graphql/query/serial_execution/operation_resolution.rb,
lib/graphql/query/serial_execution/selection_resolution.rb

Overview

A combination of query string and Schema instance which can be reduced to a #result.

Defined Under Namespace

Modules: ArgumentsCache, Fingerprint Classes: Arguments, Context, Executor, InputValidationResult, LiteralInput, NullContext, OperationNameMissingError, Result, SerialExecution, ValidationPipeline, VariableValidationError, Variables

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Tracing::Traceable

#trace

Constructor Details

#initialize(schema, query_string = nil, query: nil, document: nil, context: nil, variables: nil, validate: true, subscription_topic: nil, operation_name: nil, root_value: nil, max_depth: schema.max_depth, max_complexity: schema.max_complexity, except: nil, only: nil, warden: nil) ⇒ Query

Prepare query query_string on schema

Parameters:

  • schema (GraphQL::Schema)
  • query_string (String) (defaults to: nil)
  • context (#[]) (defaults to: nil) —

    an arbitrary hash of values which you can access in Field#resolve

  • variables (Hash) (defaults to: nil) —

    values for $variables in the query

  • operation_name (String) (defaults to: nil) —

    if the query string contains many operations, this is the one which should be executed

  • root_value (Object) (defaults to: nil) —

    the object used to resolve fields on the root type

  • max_depth (Numeric) (defaults to: schema.max_depth) —

    the maximum number of nested selections allowed for this query (falls back to schema-level value)

  • max_complexity (Numeric) (defaults to: schema.max_complexity) —

    the maximum field complexity for this query (falls back to schema-level value)

  • except (<#call(schema_member, context)>) (defaults to: nil) —

    If provided, objects will be hidden from the schema when .call(schema_member, context) returns truthy

  • only (<#call(schema_member, context)>) (defaults to: nil) —

    If provided, objects will be hidden from the schema when .call(schema_member, context) returns false



82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
 
# File 'lib/graphql/query.rb', line 82

def initialize(schema, query_string = nil, query: nil, document: nil, context: nil, variables: nil, validate: true, subscription_topic: nil, operation_name: nil, root_value: nil, max_depth: schema.max_depth, max_complexity: schema.max_complexity, except: nil, only: nil, warden: nil)
  # Even if `variables: nil` is passed, use an empty hash for simpler logic
  variables ||= {}

  # Use the `.graphql_definition` here which will return legacy types instead of classes
  if schema.is_a?(Class) && !schema.interpreter?
    schema = schema.graphql_definition
  end
  @schema = schema
  @interpreter = @schema.interpreter?
  @filter = schema.default_filter.merge(except: except, only: only)
  @context = schema.context_class.new(query: self, object: root_value, values: context)
  @warden = warden
  @subscription_topic = subscription_topic
  @root_value = root_value
  @fragments = nil
  @operations = nil
  @validate = validate
  @tracers = schema.tracers + (context ? context.fetch(:tracers, []) : [])
  # Support `ctx[:backtrace] = true` for wrapping backtraces
  if context && context[:backtrace] && !@tracers.include?(GraphQL::Backtrace::Tracer)
    @tracers << GraphQL::Backtrace::Tracer
  end

  @analysis_errors = []
  if variables.is_a?(String)
    raise ArgumentError, "Query variables should be a Hash, not a String. Try JSON.parse to prepare variables."
  else
    @provided_variables = variables || {}
  end

  @query_string = query_string || query
  @document = document

  if @query_string && @document
    raise ArgumentError, "Query should only be provided a query string or a document, not both."
  end

  if @query_string && !@query_string.is_a?(String)
    raise ArgumentError, "Query string argument should be a String, got #{@query_string.class.name} instead."
  end

  # A two-layer cache of type resolution:
  # { abstract_type => { value => resolved_type } }
  @resolved_types_cache = Hash.new do |h1, k1|
    h1[k1] = Hash.new do |h2, k2|
      h2[k2] = @schema.resolve_type(k1, k2, @context)
    end
  end

  # Trying to execute a document
  # with no operations returns an empty hash
  @ast_variables = []
  @mutation = false
  @operation_name = operation_name
  @prepared_ast = false
  @validation_pipeline = nil
  @max_depth = max_depth
  @max_complexity = max_complexity

  @result_values = nil
  @executed = false

  # TODO add a general way to define schema-level filters
  if @schema.respond_to?(:visible?)
    merge_filters(only: @schema.method(:visible?))
  end
end

Instance Attribute Details

#analysis_errors ⇒ Object

Returns the value of attribute analysis_errors.



314
315
316
 
# File 'lib/graphql/query.rb', line 314

def analysis_errors
  @analysis_errors
end

#context ⇒ Object (readonly)

Returns the value of attribute context.



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

def context
  @context
end

#multiplex ⇒ Object

Returns the value of attribute multiplex.



160
161
162
 
# File 'lib/graphql/query.rb', line 160

def multiplex
  @multiplex
end

#operation_name ⇒ nil, String

Returns The operation name provided by client or the one inferred from the document. Used to determine which operation to run.

Returns:

  • (nil, String) —

    The operation name provided by client or the one inferred from the document. Used to determine which operation to run.



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

def operation_name
  @operation_name
end

#provided_variables ⇒ Object (readonly)

Returns the value of attribute provided_variables.



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

def provided_variables
  @provided_variables
end

#query_string ⇒ Object

If a document was provided to GraphQL::Schema#execute instead of the raw query string, we will need to get it from the document



152
153
154
 
# File 'lib/graphql/query.rb', line 152

def query_string
  @query_string ||= (document ? document.to_query_string : nil)
end

#result_values ⇒ 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. 



188
189
190
 
# File 'lib/graphql/query.rb', line 188

def result_values
  @result_values
end

#root_value ⇒ Object

The value for root types



36
37
38
 
# File 'lib/graphql/query.rb', line 36

def root_value
  @root_value
end

#schema ⇒ Object (readonly)

Returns the value of attribute schema.



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

def schema
  @schema
end

#subscription_topic ⇒ String? (readonly)

Returns the triggered event, if this query is a subscription update.

Returns:

  • (String, nil) —

    the triggered event, if this query is a subscription update



67
68
69
 
# File 'lib/graphql/query.rb', line 67

def subscription_topic
  @subscription_topic
end

#tracers ⇒ Object (readonly)

Returns the value of attribute tracers.



69
70
71
 
# File 'lib/graphql/query.rb', line 69

def tracers
  @tracers
end

#validate ⇒ Boolean

Returns if false, static validation is skipped (execution behavior for invalid queries is undefined).

Returns:

  • (Boolean) —

    if false, static validation is skipped (execution behavior for invalid queries is undefined)



42
43
44
 
# File 'lib/graphql/query.rb', line 42

def validate
  @validate
end

Instance Method Details

#arguments_cache ⇒ Object 



263
264
265
266
267
268
269
 
# File 'lib/graphql/query.rb', line 263

def arguments_cache
  if interpreter?
    @arguments_cache ||= Execution::Interpreter::ArgumentsCache.new(self)
  else
    @arguments_cache ||= ArgumentsCache.build(self)
  end
end

#arguments_for(ast_node, definition, parent_object: nil) ⇒ Object

Node-level cache for calculating arguments. Used during execution and query analysis.

Parameters:



255
256
257
258
259
260
261
 
# File 'lib/graphql/query.rb', line 255

def arguments_for(ast_node, definition, parent_object: nil)
  if interpreter?
    arguments_cache.fetch(ast_node, definition, parent_object)
  else
    arguments_cache[ast_node][definition]
  end
end

#document ⇒ GraphQL::Language::Nodes::Document

Returns:



47
48
49
50
51
52
53
54
 
# File 'lib/graphql/query.rb', line 47

def document
  # It's ok if this hasn't been assigned yet
  if @query_string || @document
    with_prepared_ast { @document }
  else
    nil
  end
end

#executed? ⇒ Boolean

Returns:

  • (Boolean) 


207
208
209
 
# File 'lib/graphql/query.rb', line 207

def executed?
  @executed
end

#fingerprint ⇒ String

This contains a few components:

  • The selected operation name (or anonymous)
  • The fingerprint of the query string
  • The number of given variables (for readability)
  • The fingerprint of the given variables

This fingerprint can be used to track runs of the same operation-variables combination over time.

Returns:

  • (String) —

    An opaque hash identifying this operation-variables combination

See Also:



293
294
295
 
# File 'lib/graphql/query.rb', line 293

def fingerprint
  @fingerprint ||= "#{operation_fingerprint}/#{variables_fingerprint}"
end

#fragments ⇒ Object 



190
191
192
 
# File 'lib/graphql/query.rb', line 190

def fragments
  with_prepared_ast { @fragments }
end

#inspect ⇒ Object 



56
57
58
 
# File 'lib/graphql/query.rb', line 56

def inspect
  "query ..."
end

#interpreter? ⇒ Boolean

Returns:

  • (Boolean) 


156
157
158
 
# File 'lib/graphql/query.rb', line 156

def interpreter?
  @interpreter
end

#irep_selection ⇒ Object 



240
241
242
243
244
245
246
247
248
 
# File 'lib/graphql/query.rb', line 240

def irep_selection
  @selection ||= begin
    if selected_operation && internal_representation
      internal_representation.operation_definitions[selected_operation.name]
    else
      nil
    end
  end
end

#lookahead ⇒ GraphQL::Execution::Lookahead

A lookahead for the root selections of this query

Returns:



168
169
170
171
172
173
174
175
 
# File 'lib/graphql/query.rb', line 168

def lookahead
  @lookahead ||= begin
    ast_node = selected_operation
    root_type = warden.root_type_for_operation(ast_node.operation_type || "query")
    root_type = root_type.type_class || raise("Invariant: `lookahead` only works with class-based types")
    GraphQL::Execution::Lookahead.new(query: self, root_type: root_type, ast_nodes: [ast_node])
  end
end

#merge_filters(only: nil, except: nil) ⇒ void

This method returns an undefined value.



350
351
352
353
354
355
356
357
 
# File 'lib/graphql/query.rb', line 350

def merge_filters(only: nil, except: nil)
  if @prepared_ast
    raise "Can't add filters after preparing the query"
  else
    @filter = @filter.merge(only: only, except: except)
  end
  nil
end

#mutation? ⇒ Boolean

Returns:

  • (Boolean) 


341
342
343
 
# File 'lib/graphql/query.rb', line 341

def mutation?
  with_prepared_ast { @mutation }
end

#operation_fingerprint ⇒ String

Returns An opaque hash for identifying this query's given query string and selected operation.

Returns:

  • (String) —

    An opaque hash for identifying this query's given query string and selected operation



298
299
300
 
# File 'lib/graphql/query.rb', line 298

def operation_fingerprint
  @operation_fingerprint ||= "#{selected_operation_name || "anonymous"}/#{Fingerprint.generate(query_string)}"
end

#operations ⇒ Object 



194
195
196
 
# File 'lib/graphql/query.rb', line 194

def operations
  with_prepared_ast { @operations }
end

#query? ⇒ Boolean

Returns:

  • (Boolean) 


345
346
347
 
# File 'lib/graphql/query.rb', line 345

def query?
  with_prepared_ast { @query }
end

#resolve_type(abstract_type, value = :__undefined__) ⇒ GraphQL::ObjectType?

Returns The runtime type of value from Schema#resolve_type.

Parameters:

Returns:

See Also:

  • to apply filtering from `only` / `except`


329
330
331
332
333
334
335
336
337
338
339
 
# File 'lib/graphql/query.rb', line 329

def resolve_type(abstract_type, value = :__undefined__)
  if value.is_a?(Symbol) && value == :__undefined__
    # Old method signature
    value = abstract_type
    abstract_type = nil
  end
  if value.is_a?(GraphQL::Schema::Object)
    value = value.object
  end
  @resolved_types_cache[abstract_type][value]
end

#result ⇒ Hash

Get the result for this query, executing it once

Returns:

  • (Hash) —

    A GraphQL response, with "data" and/or "errors" keys



200
201
202
203
204
205
 
# File 'lib/graphql/query.rb', line 200

def result
  if !@executed
    Execution::Multiplex.run_queries(@schema, [self], context: @context)
  end
  @result ||= Query::Result.new(query: self, values: @result_values)
end

#sanitized_query_string(inline_variables: true) ⇒ String?

A version of the given query string, with:

  • Variables inlined to the query
  • Strings replaced with <REDACTED>

Returns:

  • (String, nil) —

    Returns nil if the query is invalid.



275
276
277
278
279
 
# File 'lib/graphql/query.rb', line 275

def sanitized_query_string(inline_variables: true)
  with_prepared_ast {
    schema.sanitized_printer.new(self, inline_variables: inline_variables).sanitized_query_string
  }
end

#selected_operation ⇒ GraphQL::Language::Nodes::OperationDefinition?

This is the operation to run for this query. If more than one operation is present, it must be named at runtime.

Returns:



218
219
220
 
# File 'lib/graphql/query.rb', line 218

def selected_operation
  with_prepared_ast { @selected_operation }
end

#selected_operation_name ⇒ String?

Returns The name of the operation to run (may be inferred).

Returns:

  • (String, nil) —

    The name of the operation to run (may be inferred)



61
62
63
64
 
# File 'lib/graphql/query.rb', line 61

def selected_operation_name
  return nil unless selected_operation
  selected_operation.name
end

#static_errors ⇒ Object 



211
212
213
 
# File 'lib/graphql/query.rb', line 211

def static_errors
  validation_errors + analysis_errors + context.errors
end

#subscription? ⇒ Boolean

Returns:

  • (Boolean) 


359
360
361
 
# File 'lib/graphql/query.rb', line 359

def subscription?
  with_prepared_ast { @subscription }
end

#subscription_update? ⇒ Boolean

Returns:

  • (Boolean) 


162
163
164
 
# File 'lib/graphql/query.rb', line 162

def subscription_update?
  @subscription_topic && subscription?
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


315
316
317
 
# File 'lib/graphql/query.rb', line 315

def valid?
  validation_pipeline.valid? && analysis_errors.empty?
end

#validation_pipeline ⇒ Object 



307
308
309
 
# File 'lib/graphql/query.rb', line 307

def validation_pipeline
  with_prepared_ast { @validation_pipeline }
end

#variables ⇒ GraphQL::Query::Variables

Determine the values for variables of this query, using default values if a value isn't provided at runtime.

If some variable is invalid, errors are added to #validation_errors.

Returns:



228
229
230
231
232
233
234
235
236
237
238
 
# File 'lib/graphql/query.rb', line 228

def variables
  @variables ||= begin
    with_prepared_ast {
      GraphQL::Query::Variables.new(
        @context,
        @ast_variables,
        @provided_variables,
      )
    }
  end
end

#variables_fingerprint ⇒ String

Returns An opaque hash for identifying this query's given a variable values (not including defaults).

Returns:

  • (String) —

    An opaque hash for identifying this query's given a variable values (not including defaults)



303
304
305
 
# File 'lib/graphql/query.rb', line 303

def variables_fingerprint
  @variables_fingerprint ||= "#{provided_variables.size}/#{Fingerprint.generate(provided_variables.to_json)}"
end

#warden ⇒ Object 



319
320
321
 
# File 'lib/graphql/query.rb', line 319

def warden
  with_prepared_ast { @warden }
end

#with_error_handling ⇒ 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. 



364
365
366
367
368
 
# File 'lib/graphql/query.rb', line 364

def with_error_handling
  schema.error_handler.with_error_handling(context) do
    yield
  end
end