Add some constraint at database level (#342)

* Add some constraint at database level

Fixes #79 and should fix #201 and #113 as well

* Fix tests

Delete duplicated data before adding constraints (only with Postgres, there is no way to do it with Sqlite with complex constraints like the one we are using)

Remove the constraint on media path

* We don't need to drop the media unique constraint anymore

Because we deleted it

plume-models/src/medias.rs

@@ -220,7 +220,7 @@ pub(crate) mod tests {
     use users::tests as usersTests;
     use Connection as Conn;
 
-    pub(crate) fn fill_database(conn: &Conn) -> Vec<Media> {
+    pub(crate) fn fill_database(conn: &Conn) -> (Vec<User>, Vec<Media>) {
         let mut wd = current_dir().unwrap().to_path_buf();
         while wd.pop() {
             if wd.join(".git").exists() {
@@ -236,7 +236,7 @@ pub(crate) mod tests {
         let f2 = "static/media/2.mp3".to_owned();
         fs::write(f1.clone(), []).unwrap();
         fs::write(f2.clone(), []).unwrap();
-        vec![
+        (users, vec![
             NewMedia {
                 file_path: f1,
                 alt_text: "some alt".to_owned(),
@@ -266,7 +266,7 @@ pub(crate) mod tests {
             },
         ].into_iter()
             .map(|nm| Media::insert(conn, nm))
-            .collect()
+            .collect())
     }
 
     pub(crate) fn clean(conn: &Conn) {
@@ -282,8 +282,7 @@ pub(crate) mod tests {
     fn delete() {
         let conn = &db();
         conn.test_transaction::<_, (), _>(|| {
-            let user = usersTests::fill_database(conn)[0].id;
-            fill_database(conn);
+            let user = fill_database(conn).0[0].id;
 
             let path = "static/media/test_deletion".to_owned();
             fs::write(path.clone(), []).unwrap();
@@ -316,10 +315,9 @@ pub(crate) mod tests {
     fn set_owner() {
         let conn = &db();
         conn.test_transaction::<_, (), _>(|| {
-            let users = usersTests::fill_database(conn);
+            let (users, _) = fill_database(conn);
             let u1 = &users[0];
             let u2 = &users[1];
-            fill_database(conn);
 
             let path = "static/media/test_set_owner".to_owned();
             fs::write(path.clone(), []).unwrap();