Merge pull request #553 from wesharper/bug-551-too-many-fields

Resolves an issue where querying 100+ fields on a relationship causes a pg error

Author: olirice

docs/changelog.md

@@ -89,3 +89,4 @@
 - bugfix: not null foreign keys referencing tables with RLS are marked as nullable
 
 ## master
+- bugfix: relational query with more than 100 fields fails

src/transpile.rs

@@ -1287,7 +1287,12 @@ impl NodeBuilder {
             .map(|x| x.to_sql(&quoted_block_name, param_context))
             .collect::<Result<Vec<_>, _>>()?;
 
-        let object_clause = frags.join(", ");
+        let object_clause: Vec<String> = frags
+            .chunks(50)
+            .map(|chunks| format!("jsonb_build_object({})", chunks.join(", ")))
+            .collect();
+
+        let object_clause_string = object_clause.join(" || ").to_string();
 
         let join_clause = self.table.to_join_clause(
             fkey,
@@ -1300,7 +1305,7 @@ impl NodeBuilder {
             "
             (
                 select
-                    jsonb_build_object({object_clause})
+                    {object_clause_string}
                 from
                     {quoted_schema}.{quoted_table} as {quoted_block_name}
                 where