From 87407e36fcfd4ec8d8dec2c13116fc3f9ff46230 Mon Sep 17 00:00:00 2001
From: Paul Trowbridge <fleetside72@hotmail.com>
Date: Sun, 2 Dec 2018 01:18:29 -0500
Subject: [PATCH] use select in with block and update with join back in order
 to retain lateral joins in the update

---
 .../upgrade_scripts/001.extract_schemas.sql   | 37 +++++++------------
 1 file changed, 14 insertions(+), 23 deletions(-)

diff --git a/database/upgrade_scripts/001.extract_schemas.sql b/database/upgrade_scripts/001.extract_schemas.sql
index dba329e..1f5c1d4 100644
--- a/database/upgrade_scripts/001.extract_schemas.sql
+++ b/database/upgrade_scripts/001.extract_schemas.sql
@@ -1,26 +1,9 @@
-UPDATE
-    tps.srce
-SET
-    defn =  
-            --delete "schemas" from existing json and tack on revamped layout
-            jsonb_pretty((defn - 'schemas')||
-            --rebuild the schemas key value from below
-            jsonb_build_object(
-                'schemas'
-                --aggregate all the new key values for a single soure
-                ,jsonb_agg(
-                    --combine a new key 'name' with the columns for that name
-                    jsonb_build_object('name',k)||jsonb_build_object('columns',v)
-                )
-            ))
-
-
----------------select statement test-----------------------
-/*
+WITH
+mod AS (
 SELECT 
     srce
-    ,jsonb_pretty(defn)
-    ,jsonb_pretty((defn - 'schemas')||
+    ,jsonb_pretty(defn) orig
+    ,(defn - 'schemas')||
     --rebuild the schemas key value from below
     jsonb_build_object(
         'schemas'
@@ -29,11 +12,19 @@ SELECT
             --combine a new key 'name' with the columns for that name
             jsonb_build_object('name',k)||jsonb_build_object('columns',v)
         )
-    ))
+    ) rebuild
 FROM 
     tps.srce
     LEFT JOIN LATERAL jsonb_each(defn->'schemas') WITH ORDINALITY je(k,v, rn) ON TRUE
 GROUP BY
     srce
     ,defn
-*/
\ No newline at end of file
+)
+UPDATE
+    tps.srce s
+SET
+    defn = rebuild
+FROM
+    mod
+WHERE
+    mod.srce = s.srce
\ No newline at end of file