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/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 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



81
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
 
# File 'lib/graphql/query.rb', line 81

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
  @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
  # TODO: remove support for global tracers
  @tracers = schema.tracers + GraphQL::Tracing.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

  # 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.



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

def analysis_errors
  @analysis_errors
end

#context ⇒ Object (readonly)

Returns the value of attribute context.



32
33
34
 
# File 'lib/graphql/query.rb', line 32

def context
  @context
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.



38
39
40
 
# File 'lib/graphql/query.rb', line 38

def operation_name
  @operation_name
end

#provided_variables ⇒ Object (readonly)

Returns the value of attribute provided_variables.



32
33
34
 
# File 'lib/graphql/query.rb', line 32

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



147
148
149
 
# File 'lib/graphql/query.rb', line 147

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. 



179
180
181
 
# File 'lib/graphql/query.rb', line 179

def result_values
  @result_values
end

#root_value ⇒ Object

The value for root types



35
36
37
 
# File 'lib/graphql/query.rb', line 35

def root_value
  @root_value
end

#schema ⇒ Object (readonly)

Returns the value of attribute schema.



32
33
34
 
# File 'lib/graphql/query.rb', line 32

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



66
67
68
 
# File 'lib/graphql/query.rb', line 66

def subscription_topic
  @subscription_topic
end

#tracers ⇒ Object (readonly)

Returns the value of attribute tracers.



68
69
70
 
# File 'lib/graphql/query.rb', line 68

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)



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

def validate
  @validate
end

Instance Method Details

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

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

Parameters:



248
249
250
251
252
253
254
255
256
 
# File 'lib/graphql/query.rb', line 248

def arguments_for(ast_node, definition, parent_object: nil)
  if interpreter?
    @arguments_cache ||= Execution::Interpreter::ArgumentsCache.new(self)
    @arguments_cache.fetch(ast_node, definition, parent_object)
  else
    @arguments_cache ||= ArgumentsCache.build(self)
    @arguments_cache[ast_node][definition]
  end
end

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

Returns:



46
47
48
49
50
51
52
53
 
# File 'lib/graphql/query.rb', line 46

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) 


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

def executed?
  @executed
end

#fragments ⇒ Object 



181
182
183
 
# File 'lib/graphql/query.rb', line 181

def fragments
  with_prepared_ast { @fragments }
end

#inspect ⇒ Object 



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

def inspect
  "query ..."
end

#irep_selection ⇒ Object 



233
234
235
236
237
238
239
240
241
 
# File 'lib/graphql/query.rb', line 233

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:



159
160
161
162
163
164
165
166
 
# File 'lib/graphql/query.rb', line 159

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.



311
312
313
314
315
316
317
318
 
# File 'lib/graphql/query.rb', line 311

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) 


302
303
304
 
# File 'lib/graphql/query.rb', line 302

def mutation?
  with_prepared_ast { @mutation }
end

#operations ⇒ Object 



185
186
187
 
# File 'lib/graphql/query.rb', line 185

def operations
  with_prepared_ast { @operations }
end

#query? ⇒ Boolean

Returns:

  • (Boolean) 


306
307
308
 
# File 'lib/graphql/query.rb', line 306

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`


290
291
292
293
294
295
296
297
298
299
300
 
# File 'lib/graphql/query.rb', line 290

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



191
192
193
194
195
196
197
198
 
# File 'lib/graphql/query.rb', line 191

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

#sanitized_query_string ⇒ 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.



262
263
264
265
266
 
# File 'lib/graphql/query.rb', line 262

def sanitized_query_string
  with_prepared_ast {
    GraphQL::Language::SanitizedPrinter.new(self).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:



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

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)



60
61
62
63
 
# File 'lib/graphql/query.rb', line 60

def selected_operation_name
  return nil unless selected_operation
  selected_operation.name
end

#static_errors ⇒ Object 



204
205
206
 
# File 'lib/graphql/query.rb', line 204

def static_errors
  validation_errors + analysis_errors + context.errors
end

#subscription? ⇒ Boolean

Returns:

  • (Boolean) 


320
321
322
 
# File 'lib/graphql/query.rb', line 320

def subscription?
  with_prepared_ast { @subscription }
end

#subscription_update? ⇒ Boolean

Returns:

  • (Boolean) 


153
154
155
 
# File 'lib/graphql/query.rb', line 153

def subscription_update?
  @subscription_topic && subscription?
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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

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

#validation_pipeline ⇒ Object 



268
269
270
 
# File 'lib/graphql/query.rb', line 268

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:



221
222
223
224
225
226
227
228
229
230
231
 
# File 'lib/graphql/query.rb', line 221

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

#warden ⇒ Object 



280
281
282
 
# File 'lib/graphql/query.rb', line 280

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. 



325
326
327
328
329
 
# File 'lib/graphql/query.rb', line 325

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