single column foreign key with diesel 0.13.0

main.rs

#[macro_use]                                                                    
extern crate diesel;                                                            
#[macro_use]                                                                    
extern crate diesel_codegen;                                                    
                                                                                
table! {                                                                        
//    table_a (tennant_id, part_number) {                                       
    table_a (tennant_id) {                                                      
        tennant_id -> Int8,                                                     
        part_number -> Int8,                                                    
    }                                                                           
}                                                                               
                                                                                
table! {                                                                        
    table_b (id) {                                                              
        id -> Int8,                                                             
        foo_tennant_id -> Int8,                                                 
        foo_part_number -> Int8,                                                
        order_quantity -> Int8,                                                 
    }                                                                           
}                                                                               
                                                                                
                                                                                
#[derive(Queryable, Insertable, Identifiable, Associations)]                    
#[table_name = "table_a"]                                                       
#[has_many(table_b, foreign_key = "foo_tennant_id")]                            
#[primary_key(tennant_id, part_number)]                                         
pub struct TableA {                                                             
    pub tennant_id : i64,                                                       
    pub part_number : i64,                                                      
}                                                                               
                                                                                
#[derive(Queryable, Insertable, Identifiable, Associations)]                    
#[table_name = "table_b"]                                                       
#[belongs_to(TableA)]                                                           
#[primary_key(id)]                                                              
pub struct TableB  {                                                            
    pub id : i64,                                                               
    pub foo_tennant_id : i64,                                                   
    pub foo_part_number : i64,                                                  
    pub order_quantity : i64,                                                   
}                                                                               
                                                                                
                                                                                
fn main() {                                                                     
    println!("Hello, world!");                                                  
}