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.

Instance Method Summary collapse

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 131

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 149

def derived_indexed_types
  @derived_indexed_types ||= []
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.

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.

Converts the current type from being an embedded type (that is, a type that is embedded within another indexed type) to an indexed type that resides in the named index definition. Indexed types are directly indexed into the datastore, and will be queryable from the root Query type.

Examples:

Define a campaigns index

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

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 65

def index(name, **settings, &block)
  indices.replace([Indexing::Index.new(name, settings, schema_def_state, self, &block)])
end

#indexed? ⇒ Boolean

Returns true if this type has an index.

Returns:

  • (Boolean) —

    true if this type has an index



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# File 'elasticgraph-schema_definition/lib/elastic_graph/schema_definition/mixins/has_indices.rb', line 77

def indexed?
  indices.any?
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 207

def plural_root_query_field_name
  @plural_root_query_field_name || naively_pluralize_type_name(name)
end

#root_query_fields(plural:, singular: nil) {|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

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).

Yields:

  • (SchemaElements::Field) —

    field on the root Query 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 200

def root_query_fields(plural:, singular: nil, &customization_block)
  @plural_root_query_field_name = plural
  @singular_root_query_field_name = singular
  @root_query_fields_customizations = customization_block
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 214

def singular_root_query_field_name
  @singular_root_query_field_name || to_field_name(name)
end