Merge 295fe153ad into db07125ba9

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).
 
-_1630 TILs and counting..._
+_1628 TILs and counting..._
 
 See some of the other learning resources I work on:
 - [Ruby Operator Lookup](https://www.visualmode.dev/ruby-operators)
@@ -114,7 +114,6 @@ If you've learned something here, support my efforts writing daily TILs by
 
 - [AWS CLI Requires Groff Executable](aws/aws-cli-requires-groff-executable.md)
 - [Find And Follow Server Logs](aws/find-and-follow-server-logs.md)
-- [List RDS Snapshots With Matching Identifier Prefix](aws/list-rds-snapshots-with-matching-identifier-prefix.md)
 - [Output CLI Results In Different Formats](aws/output-cli-results-in-different-formats.md)
 - [Sign Up User With Email And Password](aws/sign-up-user-with-email-and-password.md)
 - [SSH Into An ECS Container](aws/ssh-into-an-ecs-container.md)
@@ -1036,7 +1035,6 @@ If you've learned something here, support my efforts writing daily TILs by
 - [Ensure A Rake Task Cannot Write Data](rails/ensure-a-rake-task-cannot-write-data.md)
 - [Ensure Migrations Use The Latest Schema](rails/ensure-migrations-use-the-latest-schema.md)
 - [Ensure Record Saved With after_commit Callback](rails/ensure-record-saved-with-after-commit-callback.md)
-- [Filter ActiveModel Validation Errors](rails/filter-active-model-validation-errors.md)
 - [Filter ActiveStorage Blobs To Only Images](rails/filter-active-storage-blobs-to-only-images.md)
 - [Find Or Create A Record With FactoryBot](rails/find-or-create-a-record-with-factory-bot.md)
 - [Find Records With Multiple Associated Records](rails/find-records-with-multiple-associated-records.md)

aws/list-rds-snapshots-with-matching-identifier-prefix.md

@@ -1,29 +0,0 @@
-# List RDS Snapshots With Matching Identifier Prefix
-
-I'm working on a script that manually creates a snapshot which it will then
-restore to a temporary database that I can scrub and dump. The snapshots that
-this script takes are _manual_ and they are named with identifiers that have a
-defining prefix (`dev-snapshot-`). Besides the few snapshots created by this
-script, there are tons of automated snapshots that RDS creates for
-backup/recovery purposes.
-
-I want to list any snapshots that have been created by the script. I can do
-this with the `describe-db-snapshots` command and some filters.
-
-```bash
-$ aws rds describe-db-snapshots \
-  --snapshot-type manual \
-  --query "DBSnapshots[?starts_with(DBSnapshotIdentifier, 'dev-snapshot-')].DBSnapshotIdentifier" \
-  --no-cli-pager
-
-[
-    "dev-snapshot-20250327-155355"
-]
-```
-
-There are two key pieces. The `--snapshot-type manual` filter excludes all
-those automated snapshots. The `--query` both filters to any snapshots whose
-identifier `?starts_with` the prefix `dev-snapshot-` and then refines the
-output to just the `DBSnapshotIdentifier` instead of the entire JSON object.
-
-[source](https://docs.aws.amazon.com/cli/latest/reference/rds/describe-db-snapshots.html)

rails/filter-active-model-validation-errors.md

@@ -1,43 +0,0 @@
-# Filter ActiveModel Validation Errors
-
-Now that `ActiveModel` has a custom `Errors` class (as of Rails 6.1) instead of
-a hash, we get some useful functionality. Namely, we get a [`#where`
-method](https://api.rubyonrails.org/classes/ActiveModel/Errors.html#method-i-where)
-that allows us to filter errors based on the attribute name, type of
-validation, and even properties of that validation.
-
-Here I have created a new `Book` without any attributes. All of its validations
-are going to fail and we are going to have an `ActiveModel::Errors` object
-attached to it with several errors.
-
-```ruby
-> book = Book.new
-=>
-#<Book:0x00000001110397a8
-...
-> book.valid?
-=> false
-> book.errors
-=> #<ActiveModel::Errors [#<ActiveModel::Error attribute=added_by, type=blank, options={:message=>:required, :if=>#<Proc:0x0000000110096260 /Users/jbranchaud/.asdf/installs/ruby/3.2.2/lib/ruby/gems/3.2.0/gems/activerecord-7.2.1/lib/active_record/associations/builder/belongs_to.rb:130 (lambda)>}>, #<ActiveModel::Error attribute=title, type=blank, options={}>, #<ActiveModel::Error attribute=title, type=too_short, options={:count=>3}>, #<ActiveModel::Error attribute=author, type=blank, options={}>, #<ActiveModel::Error attribute=publication_date, type=blank, options={}>]>
-```
-
-Let's say I want to check for a specific validation error. I can use `#where`
-to filter down by attribute name (e.g. `:title`). I can filter even further by
-including the validation type as well (e.g. `:too_short`).
-
-```ruby
-> book.errors.where(:title)
-=>
-[#<ActiveModel::Error attribute=title, type=blank, options={}>,
- #<ActiveModel::Error attribute=title, type=too_short, options={:count=>3}>]
-> book.errors.where(:title, :too_short)
-=> [#<ActiveModel::Error attribute=title, type=too_short, options={:count=>3}>]
-> book.errors.where(:title, :too_short).first.message
-=> "is too short (minimum is 3 characters)"
-> book.errors.where(:title, :too_short).first.full_message
-=> "Title is too short (minimum is 3 characters)"
-```
-
-This filtering could be used as part of conditional checks for what flash
-message gets displayed to the user or even what route/view gets rendered in
-response to the error.