going somewhere.

src/db/_cheques.rs

@@ -1,21 +1,39 @@
-use crate::db::_external_id::ExternalId;
+use rusqlite::{Result, Transaction};
+
+use crate::db::_external_id::{AccountId, SecurityId};
 
 pub struct SecurityEmitterCheque {
-    drawer_user_id: ExternalId,
-    security_id: ExternalId,
-    cheque_number: u32,
-    amount: u32,
+    pub drawer_user_id: AccountId,
+    pub security_id: SecurityId,
+    pub payee_user_id: AccountId,
+    pub cheque_number: u32,
+    pub amount: u32,
 }
 
-impl Cheque {
-    pub fn is_valid(self: &Cheque) -> bool {
-        return true;
+impl SecurityEmitterCheque {
+    fn new_safe(tx: &Transaction,
+                drawer_user_id: AccountId,
+                security_id: SecurityId,
+                payee_user_id: AccountId,
+                amount: u32,
+                id_generator: fn() -> u32) -> Result<SecurityEmitterCheque> {
+        Ok(SecurityEmitterCheque {
+            drawer_user_id,
+            security_id,
+            payee_user_id,
+            cheque_number: id_generator(),
+            amount,
+        })
     }
 
-
-    pub fn cash_cheque(&self){
-
+    pub fn assert_valid(&self, tx: &Transaction) -> Result<()> {
+        Ok(())
     }
-
-
 }
+
+pub mod test {
+    use super::*;
+
+    #[test]
+    fn test_foo() {}
+}