Class: GraphQL::Schema
- Inherits:
-
Object
- Object
- GraphQL::Schema
- Includes:
- Define::InstanceDefinable
- Defined in:
- lib/graphql/schema.rb,
lib/graphql/schema/loader.rb,
lib/graphql/schema/warden.rb,
lib/graphql/schema/printer.rb,
lib/graphql/schema/type_map.rb,
lib/graphql/schema/validation.rb,
lib/graphql/schema/reduce_types.rb,
lib/graphql/schema/possible_types.rb,
lib/graphql/schema/type_expression.rb,
lib/graphql/schema/middleware_chain.rb,
lib/graphql/schema/rescue_middleware.rb,
lib/graphql/schema/invalid_type_error.rb,
lib/graphql/schema/timeout_middleware.rb,
lib/graphql/schema/unique_within_type.rb,
lib/graphql/schema/catchall_middleware.rb,
lib/graphql/schema/build_from_definition.rb,
lib/graphql/schema/instrumented_field_map.rb
Overview
A GraphQL schema which may be queried with Query.
The Schema contains:
- types for exposing your application
- query analyzers for assessing incoming queries (including max depth & max complexity restrictions)
- execution strategies for running incoming queries
- middleware for interacting with execution
Schemas start with root types, #query, #mutation and #subscription.
The schema will traverse the tree of fields & types, using those as starting points.
Any undiscoverable types may be provided with the types
configuration.
Schemas can restrict large incoming queries with max_depth
and max_complexity
configurations.
(These configurations can be overridden by specific calls to #execute)
Schemas can specify how queries should be executed against them.
query_execution_strategy
, mutation_execution_strategy
and subscription_execution_strategy
each apply to corresponding root types.
A schema accepts a Relay::GlobalNodeIdentification
instance for use with Relay IDs.
Defined Under Namespace
Modules: BuildFromDefinition, CatchallMiddleware, Loader, Printer, ReduceTypes, TypeExpression, UniqueWithinType Classes: InstrumentedFieldMap, InvalidDocumentError, InvalidTypeError, MiddlewareChain, PossibleTypes, RescueMiddleware, TimeoutMiddleware, TypeMap, Validation, Warden
Constant Summary collapse
- BUILT_IN_TYPES =
- DIRECTIVES =
[GraphQL::Directive::IncludeDirective, GraphQL::Directive::SkipDirective, GraphQL::Directive::DeprecatedDirective]
- DYNAMIC_FIELDS =
["__type", "__typename", "__schema"]
Instance Attribute Summary collapse
-
#directives ⇒ Object
Returns the value of attribute directives.
-
#id_from_object_proc ⇒ Object
readonly
Returns the value of attribute id_from_object_proc.
-
#instrumenters ⇒ Object
Returns the value of attribute instrumenters.
-
#max_complexity ⇒ Object
Returns the value of attribute max_complexity.
-
#max_depth ⇒ Object
Returns the value of attribute max_depth.
-
#middleware ⇒ Array<#call>
Middlewares suitable for MiddlewareChain, applied to fields during execution.
-
#mutation ⇒ Object
Returns the value of attribute mutation.
-
#mutation_execution_strategy ⇒ Object
Returns the value of attribute mutation_execution_strategy.
-
#object_from_id_proc ⇒ Object
readonly
Returns the value of attribute object_from_id_proc.
-
#orphan_types ⇒ Object
Returns the value of attribute orphan_types.
-
#query ⇒ Object
Returns the value of attribute query.
-
#query_analyzers ⇒ Object
Returns the value of attribute query_analyzers.
-
#query_execution_strategy ⇒ Object
Returns the value of attribute query_execution_strategy.
-
#resolve_type_proc ⇒ Object
readonly
Returns the value of attribute resolve_type_proc.
-
#static_validator ⇒ Object
readonly
Returns the value of attribute static_validator.
-
#subscription ⇒ Object
Returns the value of attribute subscription.
-
#subscription_execution_strategy ⇒ Object
Returns the value of attribute subscription_execution_strategy.
-
#types ⇒ GraphQL::Schema::TypeMap
readonly
{ name => type }
pairs of types in this schema.
Class Method Summary collapse
-
.from_definition(definition_string) ⇒ GraphQL::Schema
Create schema from an IDL schema.
-
.from_introspection(introspection_result) ⇒ GraphQL::Schema
Create schema with the result of an introspection query.
Instance Method Summary collapse
- #define(**kwargs, &block) ⇒ Object
-
#execute(*args) ⇒ Hash
Execute a query on itself.
- #execution_strategy_for_operation(operation) ⇒ Object
-
#get_field(parent_type, field_name) ⇒ GraphQL::Field?
Resolve field named
field_name
for typeparent_type
. -
#id_from_object(object, type, ctx) ⇒ String
Get a unique identifier from this object.
- #id_from_object=(new_proc) ⇒ Object
-
#initialize ⇒ Schema
constructor
A new instance of Schema.
-
#instrument(instrumentation_type, instrumenter) ⇒ void
Attach
instrumenter
to this schema for instrumenting events ofinstrumentation_type
. -
#object_from_id(id, ctx) ⇒ Any
Fetch an application object by its unique id.
- #object_from_id=(new_proc) ⇒ Object
-
#possible_types(type_defn) ⇒ Array<GraphQL::ObjectType>
Types which belong to
type_defn
in this schema. - #remove_handler(*args, &block) ⇒ Object
- #rescue_from(*args, &block) ⇒ Object
-
#resolve_type(object, ctx) ⇒ GraphQL::ObjectType
Determine the GraphQL type for a given object.
- #resolve_type=(new_resolve_type_proc) ⇒ Object
- #root_type_for_operation(operation) ⇒ Object
- #type_from_ast(ast_node) ⇒ Object
Methods included from Define::InstanceDefinable
Constructor Details
#initialize ⇒ Schema
Returns a new instance of Schema.
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# File 'lib/graphql/schema.rb', line 83 def initialize @orphan_types = [] @directives = DIRECTIVES.reduce({}) { |m, d| m[d.name] = d; m } @static_validator = GraphQL::StaticValidation::Validator.new(schema: self) @middleware = [] @query_analyzers = [] @resolve_type_proc = nil @object_from_id_proc = nil @id_from_object_proc = nil @instrumenters = Hash.new { |h, k| h[k] = [] } # Default to the built-in execution strategy: @query_execution_strategy = GraphQL::Query::SerialExecution @mutation_execution_strategy = GraphQL::Query::SerialExecution @subscription_execution_strategy = GraphQL::Query::SerialExecution end |
Instance Attribute Details
#directives ⇒ Object
Returns the value of attribute directives.
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# File 'lib/graphql/schema.rb', line 62 def directives @directives end |
#id_from_object_proc ⇒ Object (readonly)
Returns the value of attribute id_from_object_proc.
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# File 'lib/graphql/schema.rb', line 73 def id_from_object_proc @id_from_object_proc end |
#instrumenters ⇒ Object
Returns the value of attribute instrumenters.
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# File 'lib/graphql/schema.rb', line 62 def instrumenters @instrumenters end |
#max_complexity ⇒ Object
Returns the value of attribute max_complexity.
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# File 'lib/graphql/schema.rb', line 62 def max_complexity @max_complexity end |
#max_depth ⇒ Object
Returns the value of attribute max_depth.
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# File 'lib/graphql/schema.rb', line 62 def max_depth @max_depth end |
#middleware ⇒ Array<#call>
Returns Middlewares suitable for MiddlewareChain, applied to fields during execution.
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# File 'lib/graphql/schema.rb', line 75 def middleware @middleware end |
#mutation ⇒ Object
Returns the value of attribute mutation.
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# File 'lib/graphql/schema.rb', line 62 def mutation @mutation end |
#mutation_execution_strategy ⇒ Object
Returns the value of attribute mutation_execution_strategy.
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# File 'lib/graphql/schema.rb', line 62 def mutation_execution_strategy @mutation_execution_strategy end |
#object_from_id_proc ⇒ Object (readonly)
Returns the value of attribute object_from_id_proc.
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# File 'lib/graphql/schema.rb', line 73 def object_from_id_proc @object_from_id_proc end |
#orphan_types ⇒ Object
Returns the value of attribute orphan_types.
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# File 'lib/graphql/schema.rb', line 62 def orphan_types @orphan_types end |
#query ⇒ Object
Returns the value of attribute query.
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# File 'lib/graphql/schema.rb', line 62 def query @query end |
#query_analyzers ⇒ Object
Returns the value of attribute query_analyzers.
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# File 'lib/graphql/schema.rb', line 62 def query_analyzers @query_analyzers end |
#query_execution_strategy ⇒ Object
Returns the value of attribute query_execution_strategy.
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# File 'lib/graphql/schema.rb', line 62 def query_execution_strategy @query_execution_strategy end |
#resolve_type_proc ⇒ Object (readonly)
Returns the value of attribute resolve_type_proc.
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# File 'lib/graphql/schema.rb', line 73 def resolve_type_proc @resolve_type_proc end |
#static_validator ⇒ Object (readonly)
Returns the value of attribute static_validator.
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# File 'lib/graphql/schema.rb', line 73 def static_validator @static_validator end |
#subscription ⇒ Object
Returns the value of attribute subscription.
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# File 'lib/graphql/schema.rb', line 62 def subscription @subscription end |
#subscription_execution_strategy ⇒ Object
Returns the value of attribute subscription_execution_strategy.
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# File 'lib/graphql/schema.rb', line 62 def subscription_execution_strategy @subscription_execution_strategy end |
#types ⇒ GraphQL::Schema::TypeMap (readonly)
Returns { name => type }
pairs of types in this schema.
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# File 'lib/graphql/schema.rb', line 133 def types @types end |
Class Method Details
.from_definition(definition_string) ⇒ GraphQL::Schema
Create schema from an IDL schema.
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# File 'lib/graphql/schema.rb', line 271 def self.from_definition(definition_string) GraphQL::Schema::BuildFromDefinition.from_definition(definition_string) end |
.from_introspection(introspection_result) ⇒ GraphQL::Schema
Create schema with the result of an introspection query.
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# File 'lib/graphql/schema.rb', line 264 def self.from_introspection(introspection_result) GraphQL::Schema::Loader.load(introspection_result) end |
Instance Method Details
#define(**kwargs, &block) ⇒ Object
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# File 'lib/graphql/schema.rb', line 107 def define(**kwargs, &block) super ensure_defined all_types = orphan_types + [query, mutation, subscription, GraphQL::Introspection::SchemaType] @types = GraphQL::Schema::ReduceTypes.reduce(all_types.compact) build_instrumented_field_map # Assert that all necessary configs are present: validation_error = Validation.validate(self) validation_error && raise(NotImplementedError, validation_error) nil end |
#execute(*args) ⇒ Hash
Execute a query on itself. See Query#initialize for arguments.
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# File 'lib/graphql/schema.rb', line 138 def execute(*args) query_obj = GraphQL::Query.new(self, *args) query_obj.result end |
#execution_strategy_for_operation(operation) ⇒ Object
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# File 'lib/graphql/schema.rb', line 187 def execution_strategy_for_operation(operation) case operation when "query" query_execution_strategy when "mutation" mutation_execution_strategy when "subscription" subscription_execution_strategy else raise ArgumentError, "unknown operation type: #{operation}" end end |
#get_field(parent_type, field_name) ⇒ GraphQL::Field?
Resolve field named field_name
for type parent_type
.
Handles dynamic fields __typename
, __type
and __schema
, too
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# File 'lib/graphql/schema.rb', line 147 def get_field(parent_type, field_name) defined_field = @instrumented_field_map.get(parent_type.name, field_name) if defined_field defined_field elsif field_name == "__typename" GraphQL::Introspection::TypenameField.create(parent_type) elsif field_name == "__schema" && parent_type == query GraphQL::Introspection::SchemaField.create(self) elsif field_name == "__type" && parent_type == query GraphQL::Introspection::TypeByNameField.create(self) else nil end end |
#id_from_object(object, type, ctx) ⇒ String
Get a unique identifier from this object
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# File 'lib/graphql/schema.rb', line 248 def id_from_object(object, type, ctx) if @id_from_object_proc.nil? raise(NotImplementedError, "Can't generate an ID for #{object.inspect} of type #{type}, schema's `id_from_object` must be defined") else @id_from_object_proc.call(object, type, ctx) end end |
#id_from_object=(new_proc) ⇒ Object
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# File 'lib/graphql/schema.rb', line 257 def id_from_object=(new_proc) @id_from_object_proc = new_proc end |
#instrument(instrumentation_type, instrumenter) ⇒ void
This method returns an undefined value.
Attach instrumenter
to this schema for instrumenting events of instrumentation_type
.
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# File 'lib/graphql/schema.rb', line 123 def instrument(instrumentation_type, instrumenter) @instrumenters[instrumentation_type] << instrumenter if instrumentation_type == :field build_instrumented_field_map end end |
#object_from_id(id, ctx) ⇒ Any
Fetch an application object by its unique id
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# File 'lib/graphql/schema.rb', line 230 def object_from_id(id, ctx) if @object_from_id_proc.nil? raise(NotImplementedError, "Can't fetch an object for id \"#{id}\" because the schema's `object_from_id (id, ctx) -> { ... }` function is not defined") else @object_from_id_proc.call(id, ctx) end end |
#object_from_id=(new_proc) ⇒ Object
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# File 'lib/graphql/schema.rb', line 239 def object_from_id=(new_proc) @object_from_id_proc = new_proc end |
#possible_types(type_defn) ⇒ Array<GraphQL::ObjectType>
Returns types which belong to type_defn
in this schema.
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# File 'lib/graphql/schema.rb', line 169 def possible_types(type_defn) @possible_types ||= GraphQL::Schema::PossibleTypes.new(self) @possible_types.possible_types(type_defn) end |
#remove_handler(*args, &block) ⇒ Object
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# File 'lib/graphql/schema.rb', line 103 def remove_handler(*args, &block) rescue_middleware.remove_handler(*args, &block) end |
#rescue_from(*args, &block) ⇒ Object
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# File 'lib/graphql/schema.rb', line 99 def rescue_from(*args, &block) rescue_middleware.rescue_from(*args, &block) end |
#resolve_type(object, ctx) ⇒ GraphQL::ObjectType
Determine the GraphQL type for a given object.
This is required for unions and interfaces (including Relay's Node
interface)
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# File 'lib/graphql/schema.rb', line 206 def resolve_type(object, ctx) if @resolve_type_proc.nil? raise(NotImplementedError, "Can't determine GraphQL type for: #{object.inspect}, define `resolve_type (obj, ctx) -> { ... }` inside `Schema.define`.") end type_result = @resolve_type_proc.call(object, ctx) if type_result.nil? nil elsif !type_result.is_a?(GraphQL::BaseType) type_str = "#{type_result} (#{type_result.class.name})" raise "resolve_type(#{object}) returned #{type_str}, but it should return a GraphQL type" else type_result end end |
#resolve_type=(new_resolve_type_proc) ⇒ Object
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# File 'lib/graphql/schema.rb', line 222 def resolve_type=(new_resolve_type_proc) @resolve_type_proc = new_resolve_type_proc end |
#root_type_for_operation(operation) ⇒ Object
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# File 'lib/graphql/schema.rb', line 174 def root_type_for_operation(operation) case operation when "query" query when "mutation" mutation when "subscription" subscription else raise ArgumentError, "unknown operation type: #{operation}" end end |
#type_from_ast(ast_node) ⇒ Object
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# File 'lib/graphql/schema.rb', line 162 def type_from_ast(ast_node) GraphQL::Schema::TypeExpression.build_type(self.types, ast_node) end |