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: schema.max_depth, max_complexity: schema.max_complexity, 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



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# File 'lib/graphql/query.rb', line 81

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)
  # 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
  @max_complexity = 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_errors ⇒ Object

Returns the value of attribute analysis_errors



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# File 'lib/graphql/query.rb', line 250

def analysis_errors
  @analysis_errors
end

#context ⇒ Object (readonly)

Returns the value of attribute context



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

def context
  @context
end

#operation_name ⇒ nil, 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.



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

def operation_name
  @operation_name
end

#provided_variables ⇒ Object (readonly)

Returns the value of attribute provided_variables



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

def provided_variables
  @provided_variables
end

#query_string ⇒ Object

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



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

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

#result_values ⇒ 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. 



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

def result_values
  @result_values
end

#root_value ⇒ Object

The value for root types



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

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 32

def schema
  @schema
end

#subscription_topic ⇒ String? (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



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

def subscription_topic
  @subscription_topic
end

#tracers ⇒ Object (readonly)

Returns the value of attribute tracers



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# File 'lib/graphql/query.rb', line 68

def tracers
  @tracers
end

#validate ⇒ Boolean

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)



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# 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:



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

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

#document ⇒ GraphQL::Language::Nodes::Document

Returns:



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

def document
  # It's ok if this hasn't been assigned yet
  if @query_string || @document
    with_prepared_ast { @document }
  else
    nil
  end
end

#fragments ⇒ Object 



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

def fragments
  with_prepared_ast { @fragments }
end

#inspect ⇒ Object 



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

def inspect
  "query ..."
end

#irep_selection ⇒ Object 



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# File 'lib/graphql/query.rb', line 226

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

#lookahead ⇒ GraphQL::Execution::Lookahead

A lookahead for the root selections of this query

Returns:



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# File 'lib/graphql/query.rb', line 156

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



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

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) 


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

def mutation?
  with_prepared_ast { @mutation }
end

#operations ⇒ Object 



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

def operations
  with_prepared_ast { @operations }
end

#query? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/query.rb', line 281

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`


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

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

#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 188

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_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:



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# File 'lib/graphql/query.rb', line 204

def selected_operation
  with_prepared_ast { @selected_operation }
end

#selected_operation_name ⇒ String?

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

Returns:

  • (String, nil) —

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



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# File 'lib/graphql/query.rb', line 60

def selected_operation_name
  return nil unless selected_operation
  selected_operation.name
end

#static_errors ⇒ Object 



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

def static_errors
  validation_errors + analysis_errors + context.errors
end

#subscription? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/query.rb', line 295

def subscription?
  with_prepared_ast { @subscription }
end

#subscription_update? ⇒ Boolean

Returns:

  • (Boolean) 


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

def subscription_update?
  @subscription_topic && subscription?
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/graphql/query.rb', line 251

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

#validation_pipeline ⇒ Object 



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

def validation_pipeline
  with_prepared_ast { @validation_pipeline }
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 214

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

#warden ⇒ Object 



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# File 'lib/graphql/query.rb', line 255

def warden
  with_prepared_ast { @warden }
end