Class: GraphQL::Query

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/query.rb,
lib/graphql/query/context.rb,
lib/graphql/query/executor.rb,
lib/graphql/query/arguments.rb,
lib/graphql/query/variables.rb,
lib/graphql/query/literal_input.rb,
lib/graphql/query/serial_execution.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/execution_context.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

Classes: Arguments, Context, Executor, InputValidationResult, LiteralInput, OperationNameMissingError, SerialExecution, VariableValidationError, Variables

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(schema, query_string = nil, document: nil, context: nil, variables: {}, validate: true, operation_name: nil, root_value: nil, max_depth: nil, max_complexity: 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: {}) —

    values for $variables in the query

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

    if true, query_string will be validated with StaticValidation::Validator

  • 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: nil) —

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

  • max_complexity (Numeric) (defaults to: nil) —

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



32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
 
# File 'lib/graphql/query.rb', line 32

def initialize(schema, query_string = nil, document: nil, context: nil, variables: {}, validate: true, operation_name: nil, root_value: nil, max_depth: nil, max_complexity: nil)
  fail ArgumentError, "a query string or document is required" unless query_string || document

  @schema = schema
  @max_depth = max_depth || schema.max_depth
  @max_complexity = max_complexity || schema.max_complexity
  @query_analyzers = schema.query_analyzers.dup
  if @max_depth
    @query_analyzers << GraphQL::Analysis::MaxQueryDepth.new(@max_depth)
  end
  if @max_complexity
    @query_analyzers << GraphQL::Analysis::MaxQueryComplexity.new(@max_complexity)
  end
  @context = Context.new(query: self, values: context)
  @root_value = root_value
  @validate = validate
  @operation_name = operation_name
  @fragments = {}
  @operations = {}
  @provided_variables = variables
  @query_string = query_string

  @document = document || GraphQL.parse(query_string)
  @document.definitions.each do |part|
    if part.is_a?(GraphQL::Language::Nodes::FragmentDefinition)
      @fragments[part.name] = part
    elsif part.is_a?(GraphQL::Language::Nodes::OperationDefinition)
      @operations[part.name] = part
    else
      raise GraphQL::ExecutionError, "GraphQL query cannot contain a schema definition"
    end
  end

  @arguments_cache = Hash.new { |h, k| h[k] = {} }
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



20
21
22
 
# File 'lib/graphql/query.rb', line 20

def context
  @context
end

#document ⇒ Object (readonly)

Returns the value of attribute document.



20
21
22
 
# File 'lib/graphql/query.rb', line 20

def document
  @document
end

#fragments ⇒ Object (readonly)

Returns the value of attribute fragments.



20
21
22
 
# File 'lib/graphql/query.rb', line 20

def fragments
  @fragments
end

#max_depth ⇒ Object (readonly)

Returns the value of attribute max_depth.



20
21
22
 
# File 'lib/graphql/query.rb', line 20

def max_depth
  @max_depth
end

#operations ⇒ Object (readonly)

Returns the value of attribute operations.



20
21
22
 
# File 'lib/graphql/query.rb', line 20

def operations
  @operations
end

#query_string ⇒ Object (readonly)

Returns the value of attribute query_string.



20
21
22
 
# File 'lib/graphql/query.rb', line 20

def query_string
  @query_string
end

#root_value ⇒ Object (readonly)

Returns the value of attribute root_value.



20
21
22
 
# File 'lib/graphql/query.rb', line 20

def root_value
  @root_value
end

#schema ⇒ Object (readonly)

Returns the value of attribute schema.



20
21
22
 
# File 'lib/graphql/query.rb', line 20

def schema
  @schema
end

Instance Method Details

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

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

Returns:



120
121
122
123
124
125
126
127
128
 
# File 'lib/graphql/query.rb', line 120

def arguments_for(irep_node, definition)
  @arguments_cache[irep_node][definition] ||= begin
    GraphQL::Query::LiteralInput.from_arguments(
      irep_node.ast_node.arguments,
      definition.arguments,
      self.variables
    )
  end
end

#internal_representation ⇒ Object 



104
105
106
107
108
109
 
# File 'lib/graphql/query.rb', line 104

def internal_representation
  @internal_representation ||= begin
    perform_validation
    @internal_representation
  end
end

#result ⇒ Object

Get the result for this query, executing it once



69
70
71
72
73
74
75
76
77
78
 
# File 'lib/graphql/query.rb', line 69

def result
  @result ||= begin
    if @validate && (validation_errors.any? || analysis_errors.any?)
      { "errors" => validation_errors + analysis_errors}
    else
      Executor.new(self).result
    end
  end

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:



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

def selected_operation
  @selected_operation ||= begin
    perform_validation
    @selected_operation
  end
end

#validation_errors ⇒ Object 



111
112
113
114
115
116
 
# File 'lib/graphql/query.rb', line 111

def validation_errors
  @validation_errors ||= begin
    perform_validation
    @validation_errors
  end
end

#variables ⇒ GraphQL::Query::Variables

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

Raises if a non-null variable isn't provided at runtime.

Returns:



96
97
98
99
100
101
102
 
# File 'lib/graphql/query.rb', line 96

def variables
  @variables ||= GraphQL::Query::Variables.new(
    schema,
    selected_operation.variables,
    @provided_variables
  )
end