Module wundergraph::query_builder::selection

This module contains all functionality that is needed to implement a wundergraph entity

In general wundergraph entities should be implemented using the provided custom derive. Only for cases where the default implementation does not your requirements a manual implementation should be done.

Deriving

See the documentation of WundergraphEntity for possible options.

Manual implementation

Double check that a manual implementation is really required and could not be replaced by using the provided derive + QueryModifier

For a manual implementation of a wundergraph entity it is required to implement at least the following traits for your type:

• LoadingHandler
• WundergraphGraphqlMapper
• For each foreign key field WundergraphBelongsTo
• BuildFilterHelper if you use your entity somewhere as part of a filter

See the documentation of the corresponding traits on details about the actual implementation

Modules

fields	This module contains helper types to work with fields of wundergraph entities
filter	This module contains data structures to build a generic graphql interface to filter entities. The main entry point is the Filter struct

Traits

LoadingHandler	Main entry point for loading database entities as GraphQL objects
QueryModifier	A trait to modify the query generated by the default LoadingHandler implementation

Type Definitions

BoxedQuery	A helper type to simplify the select statement query type for a given loading handler.
SqlTypeOfPlaceholder	A helper type that represents the diesel sql type of a given entity

Derive Macros

WundergraphEntity

A custom derive to implement all wundergraph related traits for a entity Using this trait implies internally #[derive(WundergraphBelongsTo)] and #[derive(BuildFilterHelper)]