Allow creating Edge items via the create_item API

src/internal_api.rs

@@ -84,14 +84,6 @@ pub fn create_item_tx(
     cli: &CliOptions,
     database_key: &DatabaseKey,
 ) -> Result<String> {
-    if schema::is_edge(&item._type) {
-        return Err(Error {
-            code: StatusCode::BAD_REQUEST,
-            msg: "Cannot create edges via item addition API. Use create_edge or similar APIs \
-            in order to also create _source, _target bindings"
-                .to_string(),
-        });
-    };
     let id: String = if let Some(id) = &item.id {
         id.to_string()
     } else {
@@ -607,6 +599,23 @@ mod tests {
         };
     }
 
+    #[test]
+    /// Test creating an item that has type="Edge"
+    fn test_create_edge_item() {
+        let mut conn = new_conn();
+        let cli = command_line_interface::tests::test_cli();
+        let db_key = DatabaseKey::from("".to_string()).unwrap();
+        let tx = conn.transaction().unwrap();
+        let mut schema = database_api::get_schema(&tx).unwrap();
+        let edge_item = json!({
+            "type": "Edge",
+        });
+        let edge_item: CreateItem = serde_json::from_value(edge_item).unwrap();
+        // Creating raw "Edge" items should be successful.
+        // (It is also the way how Memri clients push edge information to the Pod.)
+        create_item_tx(&tx, &mut schema, edge_item, "", &cli, &db_key).unwrap();
+    }
+
     #[test]
     fn test_edge_search() {
         let mut conn = new_conn();

src/schema.rs

@@ -89,13 +89,6 @@ fn validate_property_name_syntax(property: &str) -> Result<()> {
     }
 }
 
-/// Returns whether an item type is an "Edge".
-/// Currently, only literally "Edge" item type is an edge. This implementation is UNSTABLE.
-/// See `docs/HTTP_API.md` for details.
-pub fn is_edge(item_type: &str) -> bool {
-    item_type == "Edge"
-}
-
 /// All item properties should be of this format
 pub fn validate_property_name(property: &str) -> Result<()> {
     if let Err(err) = validate_property_name_syntax(property) {