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/variables.rb,
lib/graphql/query/fingerprint.rb,
lib/graphql/query/null_context.rb,
lib/graphql/query/validation_pipeline.rb,
lib/graphql/query/input_validation_result.rb,
lib/graphql/query/variable_validation_error.rb

Overview

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

Defined Under Namespace

Modules: Fingerprint Classes: Context, InputValidationResult, NullContext, OperationNameMissingError, Result, 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



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

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 ||= {}
  @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
  @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_errorsObject

Returns the value of attribute analysis_errors.



284
285
286
# File 'lib/graphql/query.rb', line 284

def analysis_errors
  @analysis_errors
end

#contextObject (readonly)

Returns the value of attribute context.



28
29
30
# File 'lib/graphql/query.rb', line 28

def context
  @context
end

#multiplexObject

Returns the value of attribute multiplex.



149
150
151
# File 'lib/graphql/query.rb', line 149

def multiplex
  @multiplex
end

#operation_namenil, 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.



34
35
36
# File 'lib/graphql/query.rb', line 34

def operation_name
  @operation_name
end

#provided_variablesObject (readonly)

Returns the value of attribute provided_variables.



28
29
30
# File 'lib/graphql/query.rb', line 28

def provided_variables
  @provided_variables
end

#query_stringObject

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



141
142
143
# File 'lib/graphql/query.rb', line 141

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

#result_valuesObject

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.



176
177
178
# File 'lib/graphql/query.rb', line 176

def result_values
  @result_values
end

#root_valueObject

The value for root types



31
32
33
# File 'lib/graphql/query.rb', line 31

def root_value
  @root_value
end

#schemaObject (readonly)

Returns the value of attribute schema.



28
29
30
# File 'lib/graphql/query.rb', line 28

def schema
  @schema
end

#subscription_topicString? (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



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

def subscription_topic
  @subscription_topic
end

#tracersObject (readonly)

Returns the value of attribute tracers.



64
65
66
# File 'lib/graphql/query.rb', line 64

def tracers
  @tracers
end

#validateBoolean

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)



37
38
39
# File 'lib/graphql/query.rb', line 37

def validate
  @validate
end

Instance Method Details

#arguments_cacheObject



237
238
239
# File 'lib/graphql/query.rb', line 237

def arguments_cache
  @arguments_cache ||= Execution::Interpreter::ArgumentsCache.new(self)
end

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

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

Parameters:



233
234
235
# File 'lib/graphql/query.rb', line 233

def arguments_for(ast_node, definition, parent_object: nil)
  arguments_cache.fetch(ast_node, definition, parent_object)
end

#documentGraphQL::Language::Nodes::Document



42
43
44
45
46
47
48
49
# File 'lib/graphql/query.rb', line 42

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)


195
196
197
# File 'lib/graphql/query.rb', line 195

def executed?
  @executed
end

#fingerprintString

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:



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

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

#fragmentsObject



178
179
180
# File 'lib/graphql/query.rb', line 178

def fragments
  with_prepared_ast { @fragments }
end

#handle_or_reraise(err) ⇒ 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.



334
335
336
# File 'lib/graphql/query.rb', line 334

def handle_or_reraise(err)
  schema.handle_or_reraise(context, err)
end

#inspectObject



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

def inspect
  "query ..."
end

#interpreter?Boolean

Returns:

  • (Boolean)


145
146
147
# File 'lib/graphql/query.rb', line 145

def interpreter?
  true
end

#lookaheadGraphQL::Execution::Lookahead

A lookahead for the root selections of this query



157
158
159
160
161
162
163
# File 'lib/graphql/query.rb', line 157

def lookahead
  @lookahead ||= begin
    ast_node = selected_operation
    root_type = warden.root_type_for_operation(ast_node.operation_type || "query")
    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.



320
321
322
323
324
325
326
327
# File 'lib/graphql/query.rb', line 320

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)


311
312
313
# File 'lib/graphql/query.rb', line 311

def mutation?
  with_prepared_ast { @mutation }
end

#operation_fingerprintString

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



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

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

#operationsObject



182
183
184
# File 'lib/graphql/query.rb', line 182

def operations
  with_prepared_ast { @operations }
end

#query?Boolean

Returns:

  • (Boolean)


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

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:

  • abstract_type (GraphQL::UnionType, GraphQL::InterfaceType)
  • value (Object) (defaults to: :__undefined__)

    Any runtime value

Returns:

See Also:

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


299
300
301
302
303
304
305
306
307
308
309
# File 'lib/graphql/query.rb', line 299

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

#resultHash

Get the result for this query, executing it once

Returns:

  • (Hash)

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



188
189
190
191
192
193
# File 'lib/graphql/query.rb', line 188

def result
  if !@executed
    Execution::Multiplex.run_all(@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.



245
246
247
248
249
# File 'lib/graphql/query.rb', line 245

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

#selected_operationGraphQL::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.



206
207
208
# File 'lib/graphql/query.rb', line 206

def selected_operation
  with_prepared_ast { @selected_operation }
end

#selected_operation_nameString?

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

Returns:

  • (String, nil)

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



56
57
58
59
# File 'lib/graphql/query.rb', line 56

def selected_operation_name
  return nil unless selected_operation
  selected_operation.name
end

#static_errorsObject



199
200
201
# File 'lib/graphql/query.rb', line 199

def static_errors
  validation_errors + analysis_errors + context.errors
end

#subscription?Boolean

Returns:

  • (Boolean)


329
330
331
# File 'lib/graphql/query.rb', line 329

def subscription?
  with_prepared_ast { @subscription }
end

#subscription_update?Boolean

Returns:

  • (Boolean)


151
152
153
# File 'lib/graphql/query.rb', line 151

def subscription_update?
  @subscription_topic && subscription?
end

#valid?Boolean

Returns:

  • (Boolean)


285
286
287
# File 'lib/graphql/query.rb', line 285

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

#validation_pipelineObject



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

def validation_pipeline
  with_prepared_ast { @validation_pipeline }
end

#variablesGraphQL::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:



216
217
218
219
220
221
222
223
224
225
226
# File 'lib/graphql/query.rb', line 216

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

#variables_fingerprintString

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)



273
274
275
# File 'lib/graphql/query.rb', line 273

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

#wardenObject



289
290
291
# File 'lib/graphql/query.rb', line 289

def warden
  with_prepared_ast { @warden }
end