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/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/catchall_middleware.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, Schema#query, Schema#mutation and Schema#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: CatchallMiddleware, Loader, Printer, ReduceTypes, TypeExpression Classes: InvalidTypeError, MiddlewareChain, PossibleTypes, RescueMiddleware, TimeoutMiddleware, TypeMap, Validation
Constant Summary collapse
- DIRECTIVES =
[GraphQL::Directive::SkipDirective, GraphQL::Directive::IncludeDirective]
- DYNAMIC_FIELDS =
["__type", "__typename", "__schema"]
- RESOLVE_TYPE_PROC_REQUIRED =
-> (obj, ctx) { raise("Schema.resolve_type is undefined, can't resolve type for #{obj.inspect}") }
Instance Attribute Summary collapse
-
#directives ⇒ Object
readonly
Returns the value of attribute directives.
-
#middleware ⇒ Array<#call>
readonly
Middlewares suitable for MiddlewareChain, applied to fields during execution.
-
#node_identification ⇒ GraphQL::Relay::GlobalNodeIdentification
The node identification instance for this schema, when using Relay.
-
#static_validator ⇒ Object
readonly
Returns the value of attribute static_validator.
Instance Method Summary collapse
-
#execute(*args) ⇒ Hash
Execute a query on itself.
- #execution_strategy_for_operation(operation) ⇒ Object
-
#get_field(parent_type, field_name) ⇒ Object
Resolve field named ‘field_name` for type `parent_type`.
-
#initialize(query: nil, mutation: nil, subscription: nil, max_depth: nil, max_complexity: nil, types: []) ⇒ Schema
constructor
A new instance of Schema.
-
#possible_types(type_defn) ⇒ Array<GraphQL::ObjectType>
TODO: when ‘resolve_type` is schema level, can this be removed?.
- #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
-
#types ⇒ GraphQL::Schema::TypeMap
‘{ name => type }` pairs of types in this schema.
Methods included from Define::InstanceDefinable
#definition_proc=, included, #metadata
Constructor Details
#initialize(query: nil, mutation: nil, subscription: nil, max_depth: nil, max_complexity: nil, types: []) ⇒ Schema
Returns a new instance of Schema.
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# File 'lib/graphql/schema.rb', line 86 def initialize(query: nil, mutation: nil, subscription: nil, max_depth: nil, max_complexity: nil, types: []) if query warn("Schema.new is deprecated, use Schema.define instead") end @query = query @mutation = mutation @subscription = subscription @max_depth = max_depth @max_complexity = max_complexity @orphan_types = types @directives = DIRECTIVES.reduce({}) { |m, d| m[d.name] = d; m } @static_validator = GraphQL::StaticValidation::Validator.new(schema: self) @rescue_middleware = GraphQL::Schema::RescueMiddleware.new @middleware = [@rescue_middleware] @query_analyzers = [] @resolve_type_proc = RESOLVE_TYPE_PROC_REQUIRED # 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 (readonly)
Returns the value of attribute directives.
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# File 'lib/graphql/schema.rb', line 68 def directives @directives end |
#middleware ⇒ Array<#call> (readonly)
Returns Middlewares suitable for MiddlewareChain, applied to fields during execution.
|
# File 'lib/graphql/schema.rb', line 78
|
#node_identification ⇒ GraphQL::Relay::GlobalNodeIdentification
Returns the node identification instance for this schema, when using Relay.
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# File 'lib/graphql/schema.rb', line 73 def node_identification=(new_node_ident) new_node_ident.schema = self @node_identification = new_node_ident end |
#static_validator ⇒ Object (readonly)
Returns the value of attribute static_validator.
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# File 'lib/graphql/schema.rb', line 68 def static_validator @static_validator end |
Instance Method Details
#execute(*args) ⇒ Hash
Execute a query on itself. See Query#initialize for arguments.
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# File 'lib/graphql/schema.rb', line 130 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 180 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) ⇒ Object
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 137 def get_field(parent_type, field_name) ensure_defined defined_field = parent_type.get_field(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.types) else nil end end |
#possible_types(type_defn) ⇒ Array<GraphQL::ObjectType>
TODO: when ‘resolve_type` is schema level, can this be removed?
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# File 'lib/graphql/schema.rb', line 161 def possible_types(type_defn) ensure_defined @interface_possible_types ||= GraphQL::Schema::PossibleTypes.new(self) @interface_possible_types.possible_types(type_defn) end |
#remove_handler(*args, &block) ⇒ Object
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# File 'lib/graphql/schema.rb', line 113 def remove_handler(*args, &block) ensure_defined @rescue_middleware.remove_handler(*args, &block) end |
#rescue_from(*args, &block) ⇒ Object
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# File 'lib/graphql/schema.rb', line 108 def rescue_from(*args, &block) ensure_defined @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 (include Relay’s node interface)
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# File 'lib/graphql/schema.rb', line 196 def resolve_type(object, ctx) ensure_defined 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 209 def resolve_type=(new_resolve_type_proc) ensure_defined @resolve_type_proc = new_resolve_type_proc end |
#root_type_for_operation(operation) ⇒ Object
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# File 'lib/graphql/schema.rb', line 167 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 153 def type_from_ast(ast_node) ensure_defined GraphQL::Schema::TypeExpression.build_type(self, ast_node) end |
#types ⇒ GraphQL::Schema::TypeMap
Returns ‘{ name => type }` pairs of types in this schema.
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# File 'lib/graphql/schema.rb', line 119 def types @types ||= begin ensure_defined all_types = orphan_types + [query, mutation, subscription, GraphQL::Introspection::SchemaType] GraphQL::Schema::ReduceTypes.reduce(all_types.compact) end end |