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/type_resolver.rb,
lib/graphql/query/serial_execution.rb,
lib/graphql/query/directive_resolution.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

Modules: DirectiveResolution Classes: Arguments, Context, Executor, InputValidationResult, LiteralInput, OperationNameMissingError, SerialExecution, TypeResolver, 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) ⇒ 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



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

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

  @schema = schema
  @max_depth = max_depth || schema.max_depth
  @context = Context.new(query: self, values: context)
  @root_value = root_value
  @validate = validate
  @operation_name = operation_name
  @fragments = {}
  @operations = {}
  @provided_variables = variables

  @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
    end
  end
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the value of attribute context.



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# File 'lib/graphql/query.rb', line 11

def context
  @context
end

#document ⇒ Object (readonly)

Returns the value of attribute document.



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# File 'lib/graphql/query.rb', line 11

def document
  @document
end

#fragments ⇒ Object (readonly)

Returns the value of attribute fragments.



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# File 'lib/graphql/query.rb', line 11

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 11

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 11

def operations
  @operations
end

#root_value ⇒ Object (readonly)

Returns the value of attribute root_value.



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# File 'lib/graphql/query.rb', line 11

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 11

def schema
  @schema
end

Instance Method Details

#result ⇒ Object

Get the result for this query, executing it once



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

def result
  if @validate && validation_errors.any?
    return { "errors" => validation_errors }
  end

  @result ||= Executor.new(self).result
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 57

def selected_operation
  @selected_operation ||= find_operation(@operations, @operation_name)
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:



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

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