Module: ElasticGraph::SchemaDefinition::Mixins::HasIndices

Included in:
SchemaElements::InterfaceType, SchemaElements::ObjectType, SchemaElements::UnionType
Defined in:
elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb

Overview

Provides APIs for defining datastore indices.

Constant Summary collapse

NAMESPACE_RESOLVER =

Resolver auto-wired on any no-argument field that returns a namespace type. A namespace type carries no data of its own; this resolver just provides a non-null passthrough object for the GraphQL machinery so each child field's own resolver can run.

SchemaArtifacts::RuntimeMetadata::ConfiguredGraphQLResolver.new(:namespace_ref, {})

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#default_graphql_resolver ⇒ ::Symbol? (readonly)

Returns the default GraphQL resolver to use for fields on this type.

Returns:

  • (::Symbol, nil) —

    the default GraphQL resolver to use for fields on this type



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 29

def default_graphql_resolver
  @default_graphql_resolver
end

Instance Method Details

#derive_indexed_type_fields(name, from_id:, route_with: nil, rollover_with: nil) {|Indexing::DerivedIndexedType| ... } ⇒ void

This method returns an undefined value.

Configures the ElasticGraph indexer to derive another type from this indexed type, using the from_id field as the source of the id of the derived type, and the provided block for the definitions of the derived fields.

Examples:

Derive a Course type from StudentCourseEnrollment events

ElasticGraph.define_schema do |schema|
  # `StudentCourseEnrollment` is a directly indexed type.
  schema.object_type "StudentCourseEnrollment" do |t|
    t.field "id", "ID"
    t.field "courseId", "ID"
    t.field "courseName", "String"
    t.field "studentName", "String"
    t.field "courseStartDate", "Date"

    t.index "student_course_enrollments"

    # Here we define how the `Course` indexed type  is derived when we index `StudentCourseEnrollment` events.
    t.derive_indexed_type_fields "Course", from_id: "courseId" do |derive|
      # `derive` is an instance of `DerivedIndexedType`.
      derive.immutable_value "name", from: "courseName"
      derive.append_only_set "students", from: "studentName"
      derive.min_value "firstOfferedDate", from: "courseStartDate"
      derive.max_value "mostRecentlyOfferedDate", from: "courseStartDate"
    end
  end

  # `Course` is an indexed type that is derived entirely from `StudentCourseEnrollment` events.
  schema.object_type "Course" do |t|
    t.field "id", "ID"
    t.field "name", "String"
    t.field "students", "[String!]!"
    t.field "firstOfferedDate", "Date"
    t.field "mostRecentlyOfferedDate", "Date"

    t.index "courses"
  end
end

Parameters:

  • name (String) —

    name of the derived type

  • from_id (String) —

    path to the source type field with id values for the derived type

  • route_with (String, nil) (defaults to: nil) —

    path to the source type field with values for shard routing on the derived type

  • rollover_with (String, nil) (defaults to: nil) —

    path to the source type field with values for index rollover on the derived type

Yields:



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 232

def derive_indexed_type_fields(
  name,
  from_id:,
  route_with: nil,
  rollover_with: nil,
  &block
)
  Indexing::DerivedIndexedType.new(
    source_type: self,
    destination_type_ref: schema_def_state.type_ref(name).to_final_form,
    id_source: from_id,
    routing_value_source: route_with,
    rollover_timestamp_value_source: rollover_with,
    &block
  ).tap { |dit| derived_indexed_types << dit }
end

#derived_indexed_types ⇒ Array<Indexing::DerivedIndexedType>

Returns list of derived types for this source type.

Returns:



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 250

def derived_indexed_types
  @derived_indexed_types ||= []
end

#directly_queryable? ⇒ Boolean

Note:

A concrete subtype that inherits an index from an abstract parent is NOT directly queryable on its own — only the abstract type that declared the index is. Use #root_document_type? to check whether a type is stored at the root of any index (own or inherited).

Returns true if this type is directly queryable via a type-specific field on the root Query type.

Returns:

  • (Boolean) —

    true if this type is directly queryable via a type-specific field on the root Query type.



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 178

def directly_queryable?
  has_own_index_def?
end

#has_own_index_def? ⇒ Boolean

Returns true if this type has its own index definition (not inherited from an abstract parent).

Returns:

  • (Boolean) —

    true if this type has its own index definition (not inherited from an abstract parent)



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 139

def has_own_index_def?
  !@own_index_def.nil?
end

#index(name, **settings) {|Indexing::Index| ... } ⇒ void

Note:

Use #root_query_fields on indexed types to name the field that will be exposed on Query.

Note:

Indexed types must also define an id field, which ElasticGraph will use as the primary key. When an abstract type declares the index, each concrete subtype must also define id.

Note:

Datastore index settings can also be defined (or overridden) in an environment-specific settings YAML file. Index settings that you want to configure differently for different environments (such as index.number_of_shards—-production and staging will probably need different numbers!) should be configured in the per-environment YAML configuration files rather than here.

This method returns an undefined value.

Declares a datastore index for the current type, converting it from an embedded type to an indexed type that is directly queryable from the root Query type. When called on an abstract interface_type or union_type, concrete subtypes inherit the index by default — they share the same datastore index without needing to call t.index themselves. A subtype can opt out of this shared index inheritance by calling t.index with a different name to use a dedicated index instead.

Examples:

Define a campaigns index on a concrete type

ElasticGraph.define_schema do |schema|
  schema.object_type "Campaign" do |t|
    t.field "id", "ID"

    t.index(
      "campaigns",
      # Configure `index.refresh_interval`.
      refresh_interval: "1s",
      # Use `index.search` to log warnings for any search query that take more than five seconds.
      search: {slowlog: {level: "WARN", threshold: {query: {warn: "5s"}}}}
    ) do |i|
      # The index can be customized further here.
    end
  end
end

Declare a shared index on an interface

ElasticGraph.define_schema do |schema|
  schema.interface_type "Vehicle" do |t|
    t.field "id", "ID"
    t.field "make", "String"
    t.index "vehicles"
  end

  schema.object_type "Car" do |t|
    t.implements "Vehicle"
    t.field "id", "ID"
    t.field "make", "String"
    t.field "numDoors", "Int"
    # Inherits the `vehicles` index — no need to call `t.index`.
  end

  schema.object_type "Motorcycle" do |t|
    t.implements "Vehicle"
    t.field "id", "ID"
    t.field "make", "String"
    t.field "engineCC", "Int"
    # Opts out of the shared index and gets its own dedicated index instead.
    t.index "motorcycles"
  end
end

Parameters:

  • name (String) —

    name of the index. See the Elasticsearch docs for restrictions.

  • settings (Hash<Symbol, Object>) —

    datastore index settings you want applied to every environment. See the Elasticsearch docs for a list of valid settings, but be sure to omit the index. prefix here.

Yields:



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 100

def index(name, **settings, &block)
  unless @can_configure_index
    raise Errors::SchemaError, "Cannot define an index on `#{self.name}` after initialization is complete. " \
      "Indices must be configured during initial type definition."
  end

  if graphql_only?
    raise Errors::SchemaError, "`#{self.name}` cannot be both an indexed type and a GraphQL-only type."
  end

  if @own_index_def
    raise Errors::SchemaError, "Cannot define multiple indices on `#{self.name}`. " \
      "Only one index per type is supported. An index named `#{@own_index_def.name}` has already been defined."
  end

  schema_def_state.register_index(name, self)
  @own_index_def = schema_def_state.factory.new_index(name, settings, self, &block)
end

#index_def ⇒ Indexing::Index?

Resolves this type's index definition. This will be one of:

  • This type's own_index_def (if it directly defines an index)
  • An inherited index from an abstract supertype (union/interface) that has an index

This type can be a subtype of multiple abstract types (e.g., implements multiple interfaces), but unless it defines its own index, at most one of its supertypes may have an index. If multiple parent types are indexed, this method raises an error to prevent ambiguity about which index to inherit.

Returns:

  • (Indexing::Index, nil) —

    the index definition, or nil if this type has no index

Raises:

  • (Errors::SchemaError) —

    if this type is a subtype of multiple indexed abstract types



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 153

def index_def
  return own_index_def if has_own_index_def?

  indexed_supertypes = recursively_resolve_supertypes.select(&:has_own_index_def?)

  if indexed_supertypes.size > 1
    parent_names = indexed_supertypes.map { |p| p.own_index_def.name }.join(", ")
    raise Errors::SchemaError,
      "The `#{name}` type is a subtype of multiple indexed abstract types (#{parent_names}). " \
      "If a concrete type does not define an index, it may not be a member of multiple indexed abstract types."
  end

  indexed_supertypes.first&.own_index_def
end

#override_runtime_metadata(**overrides) ⇒ void

This method returns an undefined value.

Configures overrides for runtime metadata. The provided runtime metadata values will be persisted in the runtime_metadata.yaml schema artifact and made available at runtime to elasticgraph-graphql and elasticgraph-indexer.



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 259

def override_runtime_metadata(**overrides)
  @runtime_metadata_overrides.merge!(overrides)
end

#own_index_def ⇒ Indexing::Index?

Returns the index definition directly defined on this type, or nil if no index is defined directly. This will be nil when a type is inheriting an index definition from an abstract parent type.

Returns:

  • (Indexing::Index, nil) —

    the index definition directly defined on this type, or nil if no index is defined directly. This will be nil when a type is inheriting an index definition from an abstract parent type.



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 134

def own_index_def
  @own_index_def
end

#plural_root_query_field_name ⇒ String

Returns the plural name of the entity; used for the root Query field that queries documents of this indexed type.

Returns:

  • (String) —

    the plural name of the entity; used for the root Query field that queries documents of this indexed type



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 337

def plural_root_query_field_name
  @plural_root_query_field_name || naively_pluralize_type_name(name)
end

#resolve_fields_with(default_resolver_name, **config) ⇒ void

This method returns an undefined value.

Configures the default GraphQL resolver that will be used to resolve the fields of this type. Individual fields can override this using SchemaElements::Field#resolve_with.

Parameters:

  • default_resolver_name (Symbol) —

    name of the GraphQL resolver to use as the default for fields of this type

  • config (Hash<Symbol, Object>) —

    configuration parameters for the resolver

See Also:



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 126

def resolve_fields_with(default_resolver_name, **config)
  @default_graphql_resolver = default_resolver_name&.then do
    SchemaArtifacts::RuntimeMetadata::ConfiguredGraphQLResolver.new(it, config)
  end
end

#root_document_type? ⇒ Boolean

Returns true if this type is a root document type that lives at a document root in the datastore (is indexed). This returns true for types with their own index definition or types that inherit an index from a supertype.

Returns:

  • (Boolean) —

    true if this type is a root document type that lives at a document root in the datastore (is indexed). This returns true for types with their own index definition or types that inherit an index from a supertype.



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 170

def root_document_type?
  !index_def.nil?
end

#root_query_fields(plural:, singular: nil, on: root_query_fields_target_namespace) {|SchemaElements::Field| ... } ⇒ void

This method returns an undefined value.

Determines what the root query fields will be to query this indexed type. In addition, this method accepts a block, which you can use to customize the root query field (such as adding a GraphQL directive to it).

Examples:

Set plural and singular names

ElasticGraph.define_schema do |schema|
  schema.object_type "Person" do |t|
    t.field "id", "ID"

    # Results in `Query.people` and `Query.personAggregations`.
    t.root_query_fields plural: "people", singular: "person"

    t.index "people"
  end
end

Customize Query fields

ElasticGraph.define_schema do |schema|
  schema.object_type "Person" do |t|
    t.field "id", "ID"

    t.root_query_fields plural: "people", singular: "person" do |f|
      # Marks `Query.people` and `Query.personAggregations` as deprecated.
      f.directive "deprecated"
    end

    t.index "people"
  end
end

Route root fields to a namespace type

ElasticGraph.define_schema do |schema|
  schema.namespace_type "OlapQuery"

  schema.on_root_query_type do |t|
    t.field "olap", "OlapQuery"
  end

  schema.object_type "Widget" do |t|
    # Results in `OlapQuery.widgets` and `OlapQuery.widgetAggregations`.
    t.root_query_fields plural: "widgets", on: "OlapQuery"
    t.field "id", "ID"
    t.index "widgets"
  end
end

Parameters:

  • plural (String) —

    the plural name of the entity; used for the root query field that queries documents of this indexed type

  • singular (String, nil) (defaults to: nil) —

    the singular name of the entity; used for the root query field (with an Aggregations suffix) that queries aggregations of this indexed type. If not provided, will derive it from the type name (e.g. converting it to camelCase or snake_case, depending on configuration).

  • on (String) (defaults to: root_query_fields_target_namespace) —

    name of the object type on which the root fields should be defined. Defaults to "Query". To route the fields to a namespace type instead, pass its name (e.g. "OlapQuery"). The target type must have been declared via namespace_type; otherwise an error is raised at schema-definition time.

Yields:

  • (SchemaElements::Field) —

    field on the target type used to query this indexed type, to support customization



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 329

def root_query_fields(plural:, singular: nil, on: root_query_fields_target_namespace, &customization_block)
  @plural_root_query_field_name = plural
  @singular_root_query_field_name = singular
  @root_query_fields_target_namespace = on
  @root_query_fields_customizations = customization_block
end

#root_query_fields_target_namespace ⇒ String

Returns name of the object type on which the root fields for this indexed type should be defined. Defaults to "Query"; can be overridden via the on: parameter of #root_query_fields.

Returns:

  • (String) —

    name of the object type on which the root fields for this indexed type should be defined. Defaults to "Query"; can be overridden via the on: parameter of #root_query_fields.



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 355

def root_query_fields_target_namespace
  @root_query_fields_target_namespace || "Query"
end

#singular_root_query_field_name ⇒ String

Returns the singular name of the entity; used for the root Query field (with an Aggregations suffix) that queries aggregations of this indexed type. If not provided, will derive it from the type name (e.g. converting it to camelCase or snake_case, depending on configuration).

Returns:

  • (String) —

    the singular name of the entity; used for the root Query field (with an Aggregations suffix) that queries aggregations of this indexed type. If not provided, will derive it from the type name (e.g. converting it to camelCase or snake_case, depending on configuration).



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 344

def singular_root_query_field_name
  @singular_root_query_field_name || to_field_name(name)
end