Class: GraphQL::Query

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
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/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, InvertedMask, LegacyMaskWrap, LiteralInput, MergedMask, 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, except: nil, only: 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

  • 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)

  • except (<#call(schema_member)>) (defaults to: nil) —

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



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

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, except: nil, only: nil)
  fail ArgumentError, "a query string or document is required" unless query_string || document

  @schema = schema
  mask = MergedMask.combine(schema.default_mask, except: except, only: only)
  @context = Context.new(query: self, values: context)
  @warden = GraphQL::Schema::Warden.new(mask, schema: @schema, context: @context)
  @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
  @root_value = root_value
  @operation_name = operation_name
  @fragments = {}
  @operations = {}
  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
  @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

  @resolved_types_cache = Hash.new { |h, k| h[k] = @schema.resolve_type(k, @context) }

  @arguments_cache = Hash.new { |h, k| h[k] = {} }
  @validation_errors = []
  @analysis_errors = []
  @internal_representation = nil
  @was_validated = false

  # Trying to execute a document
  # with no operations returns an empty hash
  @ast_variables = []
  @mutation = false
  if @operations.any?
    @selected_operation = find_operation(@operations, @operation_name)
    if @selected_operation.nil?
      @validation_errors << GraphQL::Query::OperationNameMissingError.new(@operation_name)
    else
      @ast_variables = @selected_operation.variables
      @mutation = @selected_operation.operation_type == "mutation"
    end
  end
  @result = nil
  @executed = false
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/graphql/query.rb', line 27

def context
  @context
end

#document ⇒ Object (readonly)

Returns the value of attribute document.



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# File 'lib/graphql/query.rb', line 27

def document
  @document
end

#fragments ⇒ Object (readonly)

Returns the value of attribute fragments.



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# File 'lib/graphql/query.rb', line 27

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 27

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 27

def operations
  @operations
end

#provided_variables ⇒ Object (readonly)

Returns the value of attribute provided_variables.



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# File 'lib/graphql/query.rb', line 27

def provided_variables
  @provided_variables
end

#query_string ⇒ Object (readonly)

Returns the value of attribute query_string.



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# File 'lib/graphql/query.rb', line 27

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 27

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 27

def schema
  @schema
end

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

Returns:



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# File 'lib/graphql/query.rb', line 131

def selected_operation
  @selected_operation
end

#warden ⇒ Object (readonly)

Returns the value of attribute warden.



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# File 'lib/graphql/query.rb', line 27

def warden
  @warden
end

Instance Method Details

#analysis_errors ⇒ Array<Hash>

TODO this should probably contain error instances, not hashes

Returns:

  • (Array<Hash>) —

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



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# File 'lib/graphql/query.rb', line 175

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:



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

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:



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

def internal_representation
  valid?
  @internal_representation
end

#irep_selection ⇒ Object 



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# File 'lib/graphql/query.rb', line 158

def irep_selection
  @selection ||= begin
    irep_root = internal_representation[selected_operation.name]
    GraphQL::InternalRepresentation::Selection.new(query: self, nodes: [irep_root])
  end
end

#mutation? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/query.rb', line 215

def mutation?
  @mutation
end

#resolve_type(value) ⇒ GraphQL::ObjectType?

Returns The runtime type of value from Schema#resolve_type.

Parameters:

  • value (Object) —

    Any runtime value

Returns:

See Also:

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


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

def resolve_type(value)
  @resolved_types_cache[value]
end

#result ⇒ Hash

Get the result for this query, executing it once

Returns:

  • (Hash) —

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



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# File 'lib/graphql/query.rb', line 103

def result
  if @executed
    @result
  else
    @executed = true
    instrumenters = @schema.instrumenters[:query]
    begin
      instrumenters.each { |i| i.before_query(self) }
      @result = if !valid?
        all_errors = validation_errors + analysis_errors
        if all_errors.any?
          { "errors" => all_errors.map(&:to_h) }
        else
          nil
        end
      else
        Executor.new(self).result
      end
    ensure
      instrumenters.each { |i| i.after_query(self) }
    end
  end
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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

def valid?
  @was_validated ||= begin
    @was_validated = true
    @valid = document_valid? && query_valid? && variables.errors.none?
    true
  end

  @valid
end

#validation_errors ⇒ Array<Hash>

TODO this should probably contain error instances, not hashes

Returns:

  • (Array<Hash>) —

    Static validation errors for the query string



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

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.

If some variable is invalid, errors are added to #validation_errors.

Returns:



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# File 'lib/graphql/query.rb', line 139

def variables
  @variables ||= begin
    vars = GraphQL::Query::Variables.new(
      @schema,
      @warden,
      @ast_variables,
      @provided_variables,
    )
    @validation_errors.concat(vars.errors)
    vars
  end
end