Allow `truncate` for SQLite3 adapter and add `rails db:seed:replant` (#34779)

* Add `ActiveRecord::Base.connection.truncate` for SQLite3 adapter.

SQLite doesn't support `TRUNCATE TABLE`, but SQLite3 adapter can support
`ActiveRecord::Base.connection.truncate` by using `DELETE FROM`.

`DELETE` without `WHERE` uses "The Truncate Optimization",
see https://www.sqlite.org/lang_delete.html.

* Add `rails db:seed:replant` that truncates database tables and loads the seeds

Closes #34765

1 files changed, 10 insertions, 0 deletions

diff --git a/activerecord/lib/active_record/railties/databases.rake b/activerecord/lib/active_record/railties/databases.rake
index 8de06e8466..f021a8f6c4 100644
--- a/activerecord/lib/active_record/railties/databases.rake
+++ b/activerecord/lib/active_record/railties/databases.rake
@@ -66,6 +66,11 @@ db_namespace = namespace :db do
     end
   end
 
+  # desc "Truncates tables of each database for current environment"
+  task truncate_all: [:load_config, :check_protected_environments] do
+    ActiveRecord::Tasks::DatabaseTasks.truncate_all
+  end
+
   # desc "Empty the database from DATABASE_URL or config/database.yml for the current RAILS_ENV (use db:purge:all to purge all databases in the config). Without RAILS_ENV it defaults to purging the development and test databases."
   task purge: [:load_config, :check_protected_environments] do
     ActiveRecord::Tasks::DatabaseTasks.purge_current
@@ -223,6 +228,11 @@ db_namespace = namespace :db do
     ActiveRecord::Tasks::DatabaseTasks.load_seed
   end
 
+  namespace :seed do
+    desc "Truncates tables of each database for current environment and loads the seeds"
+    task replant: [:load_config, :truncate_all, :seed]
+  end
+
   namespace :fixtures do
     desc "Loads fixtures into the current environment's database. Load specific fixtures using FIXTURES=x,y. Load from subdirectory in test/fixtures using FIXTURES_DIR=z. Specify an alternative path (eg. spec/fixtures) using FIXTURES_PATH=spec/fixtures."
     task load: :load_config do