internally using real column name and alias is for external api only

common/src/relationship.rs

@@ -6,6 +6,9 @@ pub struct RelationshipHop {
     pub from_table: String,
     pub to_table: String,
     pub fk_source_table: String,
+    /// The link column's real name, the one the database answers to. Aliases
+    /// change; a path stored in aliases would have to be rewritten every time
+    /// one did, and it is read straight into SQL.
     pub fk_column: String,
 }
 
@@ -13,9 +16,8 @@ pub struct RelationshipHop {
 pub struct RelationshipLink {
     pub source_table: String,
     pub target_table: String,
-    /// The column carrying the link, which is the name it was given. A table
+    /// The link column's real name. A table may link to one target several
-    /// may link to one target several times, so the target's name does not
+    /// times, so the target's name does not identify the column.
-    /// identify the column.
     pub fk_column: String,
 }