Update how_to_update_views.md

how_to_update_views.md

@@ -64,6 +64,31 @@ WHERE c.relkind = 'v'
     AND c.relname IN ('document_details', 'author_documents');
 
 ```
+получим вывод 
+```csv
+"create_script"
+"CREATE OR REPLACE VIEW public.author_documents AS  SELECT a.name AS author_name,
+    a.email,
+    dd.doc_id,
+    dd.title,
+    dd.type_name,
+    dd.content,
+    dd.updated_at
+   FROM authors a
+     JOIN document_authors da ON a.author_id = da.author_id
+     JOIN document_details dd ON da.doc_id = dd.doc_id;;"
+"CREATE OR REPLACE VIEW public.document_details AS  SELECT d.doc_id,
+    d.title,
+    dt.type_name,
+    ldv.content,
+    ldv.updated_at,
+    d.created_at
+   FROM documents d
+     JOIN document_types dt ON d.type_id = dt.type_id
+     LEFT JOIN latest_document_versions ldv ON d.doc_id = ldv.doc_id;;"
+
+```
+
 
 
 ### 3. Получить корректный порядок удаления
@@ -104,4 +129,33 @@ ORDER BY object_type DESC;
 ### 4. Удалить полученным скриптом из п.3 представление
 ```sql
 DROP VIEW IF EXISTS public.document_details CASCADE;
-``` 
+``` 
+
+### 5.  Обновляем document_details с измененной структурой
+```sql
+CREATE OR REPLACE VIEW public.document_details AS
+SELECT 
+    d.doc_id,
+    d.title,
+    dt.type_name,
+    ldv.content,
+    ldv.updated_at,
+    d.created_at -- Добавили поле created_at
+FROM documents d
+JOIN document_types dt ON d.type_id = dt.type_id
+LEFT JOIN latest_document_versions ldv ON d.doc_id = ldv.doc_id;
+```
+
+### 6. Восстанавливаем необходимое, скриптами из п.2
+```sql
+CREATE OR REPLACE VIEW public.author_documents AS  SELECT a.name AS author_name,
+    a.email,
+    dd.doc_id,
+    dd.title,
+    dd.type_name,
+    dd.content,
+    dd.updated_at
+   FROM authors a
+     JOIN document_authors da ON a.author_id = da.author_id
+     JOIN document_details dd ON da.doc_id = dd.doc_id;
+```