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: nil, max_complexity: nil, except: nil, only: nil) ⇒ Query

Prepare query query_string on schema

Parameters:

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

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

  • variables (Hash)

    values for $variables in the query

  • operation_name (String)

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

  • root_value (Object)

    the object used to resolve fields on the root type

  • max_depth (Numeric)

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

  • max_complexity (Numeric)

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

  • except (<#call(schema_member, context)>)

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

  • only (<#call(schema_member, context)>)

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



76
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
# File 'lib/graphql/query.rb', line 76

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: nil, max_complexity: nil, except: nil, only: 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)
  @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

  @arguments_cache = ArgumentsCache.build(self)

  # 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 || schema.max_depth
  @max_complexity = max_complexity || schema.max_complexity

  @result_values = nil
  @executed = false

  # TODO add a general way to define schema-level filters
  # TODO also add this to schema dumps
  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



240
241
242
# File 'lib/graphql/query.rb', line 240

def analysis_errors
  @analysis_errors
end

#contextObject (readonly)

Returns the value of attribute context



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

def context
  @context
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.



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

def operation_name
  @operation_name
end

#provided_variablesObject (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_stringObject

Returns the value of attribute query_string



43
44
45
# File 'lib/graphql/query.rb', line 43

def query_string
  @query_string
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.



166
167
168
# File 'lib/graphql/query.rb', line 166

def result_values
  @result_values
end

#root_valueObject

The value for root types



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

def root_value
  @root_value
end

#schemaObject (readonly)

Returns the value of attribute schema



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

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



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

def subscription_topic
  @subscription_topic
end

#tracersObject (readonly)

Returns the value of attribute tracers



63
64
65
# File 'lib/graphql/query.rb', line 63

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)



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

def validate
  @validate
end

Instance Method Details

#arguments_for(irep_or_ast_node, definition) ⇒ GraphQL::Query::Arguments

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.

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

Returns:



229
230
231
# File 'lib/graphql/query.rb', line 229

def arguments_for(irep_or_ast_node, definition)
  @arguments_cache[irep_or_ast_node][definition]
end

#documentGraphQL::Language::Nodes::Document



46
47
48
# File 'lib/graphql/query.rb', line 46

def document
  with_prepared_ast { @document }
end

#fragmentsObject



168
169
170
# File 'lib/graphql/query.rb', line 168

def fragments
  with_prepared_ast { @fragments }
end

#inspectObject



50
51
52
# File 'lib/graphql/query.rb', line 50

def inspect
  "query ..."
end

#irep_selectionObject



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

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

#lookaheadGraphQL::Execution::Lookahead

A lookahead for the root selections of this query



146
147
148
149
150
151
152
153
# File 'lib/graphql/query.rb', line 146

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.



276
277
278
279
280
281
282
283
# File 'lib/graphql/query.rb', line 276

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)


267
268
269
# File 'lib/graphql/query.rb', line 267

def mutation?
  with_prepared_ast { @mutation }
end

#operationsObject



172
173
174
# File 'lib/graphql/query.rb', line 172

def operations
  with_prepared_ast { @operations }
end

#query?Boolean

Returns:

  • (Boolean)


271
272
273
# File 'lib/graphql/query.rb', line 271

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`


255
256
257
258
259
260
261
262
263
264
265
# File 'lib/graphql/query.rb', line 255

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



178
179
180
181
182
183
184
185
# File 'lib/graphql/query.rb', line 178

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

#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.



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

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)



55
56
57
58
# File 'lib/graphql/query.rb', line 55

def selected_operation_name
  return nil unless selected_operation
  selected_operation.name
end

#static_errorsObject



187
188
189
# File 'lib/graphql/query.rb', line 187

def static_errors
  validation_errors + analysis_errors + context.errors
end

#subscription?Boolean

Returns:

  • (Boolean)


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

def subscription?
  with_prepared_ast { @subscription }
end

#subscription_update?Boolean

Returns:

  • (Boolean)


140
141
142
# File 'lib/graphql/query.rb', line 140

def subscription_update?
  @subscription_topic && subscription?
end

#valid?Boolean

Returns:

  • (Boolean)


241
242
243
# File 'lib/graphql/query.rb', line 241

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

#validation_pipelineObject



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

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:



204
205
206
207
208
209
210
211
212
213
214
# File 'lib/graphql/query.rb', line 204

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

#wardenObject



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

def warden
  with_prepared_ast { @warden }
end