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:

  • (defaults to: nil)
  • (defaults to: nil)

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

  • (defaults to: {})

    values for ‘$variables` in the query

  • (defaults to: true)

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

  • (defaults to: nil)

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

  • (defaults to: nil)

    the object used to resolve fields on the root type

  • (defaults to: nil)

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

  • (defaults to: nil)

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



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# 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] = {} }
  @validation_errors = []
  @analysis_errors = []
  @internal_representation = nil
  @was_validated = false
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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

def context
  @context
end

#document ⇒ Object (readonly)

Returns the value of attribute document.



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

def document
  @document
end

#fragments ⇒ Object (readonly)

Returns the value of attribute fragments.



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

def fragments
  @fragments
end

#max_depth ⇒ Object (readonly)

Returns the value of attribute max_depth.



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

def max_depth
  @max_depth
end

#operations ⇒ Object (readonly)

Returns the value of attribute operations.



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

def operations
  @operations
end

#query_string ⇒ Object (readonly)

Returns the value of attribute query_string.



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

def query_string
  @query_string
end

#root_value ⇒ Object (readonly)

Returns the value of attribute root_value.



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

def root_value
  @root_value
end

#schema ⇒ Object (readonly)

Returns the value of attribute schema.



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

def schema
  @schema
end

#selected_operation ⇒ GraphQL::Language::Nodes::Document? (readonly)

Returns:



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# File 'lib/graphql/query.rb', line 91

def selected_operation
  @selected_operation
end

Instance Method Details

#analysis_errors ⇒ Array<Hash>

TODO this should probably contain error instances, not hashes

Returns:

  • Errors for this particular query run (eg, exceeds max complexity)



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# File 'lib/graphql/query.rb', line 122

def analysis_errors
  valid?
  @analysis_errors
end

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

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

Returns:

  • Arguments for this node, merging default values, literal values and query variables



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# File 'lib/graphql/query.rb', line 129

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 ⇒ Hash<String, nil => GraphQL::InternalRepresentation::Node] Operation name -

Returns Irep node pairs.

Returns:

  • Irep node pairs



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# File 'lib/graphql/query.rb', line 107

def internal_representation
  valid?
  @internal_representation
end

#result ⇒ Object

Get the result for this query, executing it once



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# File 'lib/graphql/query.rb', line 72

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

#valid? ⇒ Boolean

Returns:



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# File 'lib/graphql/query.rb', line 144

def valid?
  if !@was_validated
    @was_validated = true
    @valid = if @validate
      document_valid? && query_possible? && query_valid?
    else
      true
    end
  end

  @valid
end

#validation_errors ⇒ Array<Hash>

TODO this should probably contain error instances, not hashes

Returns:

  • Static validation errors for the query string



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# File 'lib/graphql/query.rb', line 114

def validation_errors
  valid?
  @validation_errors
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:

  • Variables to apply to this query



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# File 'lib/graphql/query.rb', line 98

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