Macro map_entry_for 

macro_rules! map_entry_for {
    ($(#[$attr:meta])* $name:ident) => { ... };
    ($(#[$attr:meta])* $name:ident { key = $key:ty }) => { ... };
    ($(#[$attr:meta])* $name:ident { entry = $entry:ident }) => { ... };
    ($(#[$attr:meta])* $name:ident { key = $key:ty, entry = $entry:ident }) => { ... };
    ($(#[$attr:meta])* $name:ident { entry = $entry:ident, key = $key:ty }) => { ... };
}

Creates a new entry type implementing GraphQLMapEntry for the given type.

Examples

#[derive(Clone)]
pub struct MyType;

graphql_starter::map_entry_for!(
    #[derive(Clone)]
    MyType
);

Expands to:

#[derive(Clone)]
pub struct MyTypeEntry {
    pub key: String,
    pub value: MyType,
}

You can also configure the key type or the entry type name:

map_entry_for!(MyType { key = u32 });
map_entry_for!(MyType { entry = MyCustomTypeEntry });
map_entry_for!(MyType { key = &'static str, entry = MyEntry });