better debug print

Author: Zoran Cvetkov

graph/src/components/store/entity_cache.rs

@@ -374,8 +374,13 @@ impl EntityCache {
         let mut entity = entity;
         let old_vid = entity.set_vid(vid).expect("the vid should be set");
         // Make sure that there was no VID previously set for this entity.
-        if old_vid.is_some() {
-            bail!("VID was already present when set in EntityCache");
+        if let Some(ovid) = old_vid {
+            bail!(
+                "VID: {} of entity: {} with ID: {} was already present when set in EntityCache",
+                ovid,
+                key.entity_type,
+                entity.id()
+            );
         }
 
         self.entity_op(key.clone(), EntityOp::Update(entity));

graph/src/data/subgraph/api_version.rs

@@ -56,8 +56,8 @@ pub const SPEC_VERSION_1_2_0: Version = Version::new(1, 2, 0);
 
 // Enables subgraphs as datasource.
 // Changes the way the VID field is generated. It used to be autoincrement. Now its
-// based on block number and the order of the entities in a block. The later is
-// representing the writting order of all entity types in a subgraph.
+// based on block number and the order of the entities in a block. The latter
+// represents the write order across all entity types in the subgraph.
 pub const SPEC_VERSION_1_3_0: Version = Version::new(1, 3, 0);
 
 // The latest spec version available