Add Temporarily Turn Off Pending Migrations Error as a Rails TIL

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1460 TILs and counting..._
+_1461 TILs and counting..._
 
 ---
 
@@ -990,6 +990,7 @@ _1460 TILs and counting..._
 - [Skip Validations When Creating A Record](rails/skip-validations-when-creating-a-record.md)
 - [Specify New Attributes For #find_or_create_by](rails/specify-new-attributes-for-find-or-create-by.md)
 - [Temporarily Disable strong_params](rails/temporarily-disable-strong-params.md)
+- [Temporarily Turn Off Pending Migrations Error](rails/temporarily-turn-off-pending-migrations-error.md)
 - [Test For A Subset Of Attributes On A Model](rails/test-for-a-subset-of-attributes-on-a-model.md)
 - [Test If An Instance Variable Was Assigned](rails/test-if-an-instance-variable-was-assigned.md)
 - [Test If deliver_later Is Called For A Mailer](rails/test-if-deliver-later-is-called-for-a-mailer.md)

rails/temporarily-turn-off-pending-migrations-error.md

@@ -0,0 +1,33 @@
+# Temporarily Turn Off Pending Migrations Error
+
+Whenever I'm working on an end-to-end feature in a Rails app, soon or later I
+am going to see the _Pending Migrations_ error page. I try to visit one of the
+routes in the browser and the Rails app serves this error page instead of my
+actual request response.
+
+This is typically what I want. If there are migrations just sitting there that
+haven't been run yet, that's probably an issue. Maybe I just pulled down the
+latest changes from my teammates. The app isn't going to work properly without
+whatever schema changes are prescribed in those pending migrations.
+
+The thing to do is run those migrations.
+
+In some special cases though, I know what I'm doing and I would like to operate
+my app locally with specific migrations not yet applied.
+
+To skip the error, I can change this `config/environments/development.rb`
+setting from:
+
+```ruby
+config.active_record.migration_error = :page_load
+```
+
+to:
+
+```ruby
+config.active_record.migration_error = false
+```
+
+I just need to make sure to switch it back when I'm done.
+
+[source](https://til.hashrocket.com/posts/ujcixh5rwi-rails-ignore-pending-migrations)