You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: many_to_many.rs
    path of file: ./repos/prisma-engines/query-engine/connector-test-kit-rs/query-engine-tests/src/schemas
    
    the code of the file until where you have to start completion: use indoc::indoc;

pub fn simple_m2m() -> String {
    let schema = indoc! {
        r#"
        model ModelA {
            #id(id, String, @id)
            #m2m(manyB, ModelB[], id, String)
          }

          model ModelB {
            #id(id, String, @id)
            #m2m(manyA, ModelA[], id, String)
          }
        "#
    };

    schema.to_owned()
}

/// User <-m--
    
pub fn posts_categories() -> String {
    let schema = indoc! {
        r#"
        model Post {
            #id(id, Int, @id)
            title   String
            content String @default("Wip")
            #m2m(categories, Category[], id, Int)
        }

        model Category {
            #id(id, Int, @id)
            name String
            #m2m(posts, Post[], id, Int)
        }
        "#
    };

    schema.to_owned()
}