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FIX: DROP NOT NULL instead of changing all the rows in the table.

Browse Source 
```
change_column :topic_views, :ip_address, :inet, null: true
```

translates to

```
"ALTER TABLE \"topic_views\" ALTER COLUMN \"ip_address\" TYPE inet"
```

which locks the whole table while the migration is taking place.
This commit is contained in:
Guo Xiang Tan
2018-07-17 10:59:48 +08:00
parent 818bc10107
commit a6e9f4f44b
2 changed files with 10 additions and 7 deletions
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7
db/migrate/20180521175611_change_indexes_topic_view_item.rb
View File

@@ -1,12 +1,5 @@
class ChangeIndexesTopicViewItem < ActiveRecord::Migration[5.1]
def up
begin
Migration::SafeMigrate.disable!
change_column :topic_views, :ip_address, :inet, null: true
ensure
Migration::SafeMigrate.enable!
end
remove_index :topic_views,
column: [:ip_address, :topic_id],
name: :ip_address_topic_id_topic_views,