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/*! Base requirements for indexable document mappings. Structures that can be indexed in Elasticsearch should implement `DocumentType`. The `DocumentType` is composed of typical mapping metadata, as well as the mapping for each of its properties. Documents can be mapped as indexable types, or as an object field on another type. # Examples Define your Elasticsearch types using _Plain Old Rust Structures_. ## Derive Mapping Mapping can be generated by deriving `ElasticType` on a struct: ``` # #[macro_use] # extern crate json_str; # #[macro_use] # extern crate serde_derive; # #[macro_use] # extern crate elastic_types_derive; # #[macro_use] # extern crate elastic_types; # extern crate serde; # use elastic_types::prelude::*; #[derive(Serialize, ElasticType)] pub struct MyType { pub my_date: Date<DefaultDateMapping>, pub my_string: String, pub my_num: i32 } # fn main() { # } ``` This will produce the following field mapping: ``` # #[macro_use] # extern crate json_str; # #[macro_use] # extern crate serde_derive; # #[macro_use] # extern crate elastic_types_derive; # #[macro_use] # extern crate elastic_types; # extern crate serde; # extern crate serde_json; # use elastic_types::prelude::*; # #[derive(Serialize, ElasticType)] # pub struct MyType { # pub my_date: Date<DefaultDateMapping>, # pub my_string: String, # pub my_num: i32 # } # fn main() { # let mapping = elastic_types::derive::standalone_field_ser(MyTypeMapping).unwrap(); # let json = json_str!( { "type": "nested", "properties": { "my_date": { "type": "date", "format": "basic_date_time" }, "my_string": { "type": "text", "fields": { "keyword":{ "type":"keyword", "ignore_above":256 } } }, "my_num": { "type": "integer" } } } # ); # assert_eq!(json, mapping); # } ``` It's also possible to adjust the mapping using the `#[elastic]` attribute. ### Override Default Mapping Properties You can override the mapping meta properties for an object by providing your own mapping type with `#[elastic(mapping="{TypeName}")]`: ``` # #[macro_use] # extern crate json_str; # #[macro_use] # extern crate serde_derive; # #[macro_use] # extern crate elastic_types_derive; # #[macro_use] # extern crate elastic_types; # extern crate serde; # use elastic_types::prelude::*; #[derive(Serialize, ElasticType)] #[elastic(mapping="MyTypeMapping")] pub struct MyType { pub my_date: Date<DefaultDateMapping>, pub my_string: String, pub my_num: i32 } #[derive(Default)] pub struct MyTypeMapping; impl DocumentMapping for MyTypeMapping { //Give your own name to a type fn name() -> &'static str { "my_type" } fn data_type() -> &'static str { OBJECT_DATATYPE } } # fn main() { # } ``` This will produce the following field mapping: ``` # #[macro_use] # extern crate json_str; # #[macro_use] # extern crate serde_derive; # #[macro_use] # extern crate elastic_types_derive; # #[macro_use] # extern crate elastic_types; # extern crate serde; # extern crate serde_json; # use elastic_types::prelude::*; # #[derive(Default, Serialize, Deserialize, ElasticType)] # #[elastic(mapping="MyTypeMapping")] # pub struct MyType { # pub my_date: Date<DefaultDateMapping>, # pub my_string: String, # pub my_num: i32 # } # # #[derive(Default)] # pub struct MyTypeMapping; # impl DocumentMapping for MyTypeMapping { # fn name() -> &'static str { "my_type" } # fn data_type() -> &'static str { OBJECT_DATATYPE } # } # fn main() { # let mapping = elastic_types::derive::standalone_field_ser(MyTypeMapping).unwrap(); # let json = json_str!( { "type": "object", "properties": { "my_date": { "type": "date", "format": "basic_date_time" }, "my_string": { "type": "text", "fields": { "keyword":{ "type":"keyword", "ignore_above":256 } } }, "my_num": { "type": "integer" } } } # ); # assert_eq!(json, mapping); # } ``` ### Ignore or Rename Fields You can then serialise type mappings with `#[serde]` attributes: ``` # #[macro_use] # extern crate json_str; # #[macro_use] # extern crate serde_derive; # #[macro_use] # extern crate elastic_types_derive; # #[macro_use] # extern crate elastic_types; # extern crate serde; # use elastic_types::prelude::*; #[derive(ElasticType, Serialize)] pub struct MyType { #[serde(rename="my_renamed_date")] pub my_date: Date<DefaultDateMapping>, #[serde(skip_serializing)] pub ignored: String, pub my_num: i32 } # fn main() { # } ``` > NOTE: Fields with a `#[serde(skip_deserializing)]` attribute will still be mapped, because they can still be indexed in Elasticsearch. ## Limitations Automatically deriving mapping has the following limitations: - Generics aren't supported by auto deriving. So you can't `#[derive(ElasticType)]` on `MyType<T>`. - Mapping types can't be shared. This is because they need to map the type fields, so are specific to that type. So you can't share `MyTypeMapping` between `MyType` and `MyOtherType`. # Links - [Field Types](https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-types.html) - [Document Types](https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping.html) */ pub mod mapping; mod impls; pub use self::impls::*; pub mod prelude { /*! Includes all types for document types. This is a convenience module to make it easy to build mappings for multiple types without too many `use` statements. */ pub use super::impls::*; pub use super::mapping::*; }