COPY/MOVE

Author: pchemguy

MP COPY Subtrees.md

@@ -6,6 +6,8 @@ parent: Materialized Paths
 permalink: /mat-paths/copy
 ---
 
+The current convention for the COPY operation is to copy category subtrees only for each input category, but no category-item assignment. This convention simplifies the script
+
 ~~~sql
 WITH RECURSIVE
     json_ops(ops) AS (
@@ -40,8 +42,8 @@ WITH RECURSIVE
     subtrees_old AS (
         SELECT opid, ascii_id, path AS path_old
         FROM base_ops, categories
-        WHERE path like rootpath_old || '%'
-        ORDER BY opid, path
+        WHERE path_old like rootpath_old || '%'
+        ORDER BY opid, path_old
     ),
     LOOP_COPY AS (
             SELECT 0 AS opid, ascii_id, path_old AS path_new

MP MOVE Subtrees.md

@@ -45,7 +45,7 @@ WITH RECURSIVE
     subtrees_old AS (
         SELECT opid, ascii_id, path AS path_old
         FROM base_ops, categories
-        WHERE path like rootpath_old || '%'
+        WHERE path_old like rootpath_old || '%'
         ORDER BY opid, path_old
     ),
     LOOP_MOVE AS (
@@ -60,9 +60,8 @@ WITH RECURSIVE
             WHERE ops.opid = BUFFER.opid + 1
     ),
     subtrees_new_base AS (
-        SELECT
-            ascii_id, path_new,
-            json_extract('["' || replace(trim(path_new, '/'), '/', '", "') || '"]', '$[#-1]') AS name_new
+        SELECT ascii_id, path_new,
+               json_extract('["' || replace(trim(path_new, '/'), '/', '", "') || '"]', '$[#-1]') AS name_new
         FROM LOOP_MOVE
         WHERE opid = (SELECT max(base_ops.opid) FROM base_ops)
     ),
@@ -84,7 +83,6 @@ WITH RECURSIVE
 INSERT INTO temp.move_targets (ascii_id, path_old, path_new, prefix_new, name_new, target_exists)
 SELECT * FROM new_paths ORDER BY target_exists, path_old;
 
-
 PRAGMA defer_foreign_keys = 1;
 SAVEPOINT "MOVE_CATS";