Add Filter ActiveStorage Blobs To Only Images 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).
 
-_1610 TILs and counting..._
+_1612 TILs and counting..._
 
 See some of the other learning resources I work on:
 - [Ruby Operator Lookup](https://www.visualmode.dev/ruby-operators)
@@ -692,6 +692,7 @@ If you've learned something here, support my efforts writing daily TILs by
 ### Mise
 
 - [List The Files Being Loaded By Mise](mise/list-the-files-being-loaded-by-mise.md)
+- [Preserve Color Output For Task Command](mise/preserve-color-output-for-task-command.md)
 - [Read Existing Dot Env File Into Env Vars](mise/read-existing-dot-env-file-into-env-vars.md)
 
 ### MongoDB
@@ -1021,6 +1022,7 @@ 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 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)
 - [Force All Users To Sign Out](rails/force-all-users-to-sign-out.md)

mise/preserve-color-output-for-task-command.md

@@ -0,0 +1,45 @@
+# Preserve Color Output For Task Command
+
+I decided to wrap a couple test running commands for a project into a single
+`test:all` mise task. It looked something like this:
+
+```toml
+[tasks."test:all"]
+run = """
+bundle exec rspec
+yarn test run
+"""
+description = "Run all tests (RSpec and Vitest)"
+depends = ["bundle-install", "node-install"]
+```
+
+I can run this with `mise run test:all` and it works. However, there is a
+glaring issue that immediately juts out. All of the test runner output is
+uncolored text. I'm used to and strongly prefer greens (passes), reds (fails),
+and yellows (skips) of test runner output.
+
+The test runners lose the text coloring when run through `mise` because they
+believe they are not running in _interactive_ mode.
+
+The [`expect`](https://linux.die.net/man/1/expect) tools (`brew install
+expect`) install with another binary called
+[`unbuffer`](https://linux.die.net/man/1/unbuffer). `unbuffer` can coerce a
+command to run in interactive mode. Prepending these test runner commands with
+`unbuffer` will preserve the colors as the results are output to the terminal.
+
+Here is the update `test:all` task:
+
+```toml
+[tasks."test:all"]
+run = """
+unbuffer bundle exec rspec
+unbuffer yarn test run
+"""
+description = "Run all tests (RSpec and Vitest)"
+depends = ["bundle-install", "node-install"]
+```
+
+For some commands, it seems able to stream out (rather than _buffer_) the
+results (e.g. with `vitest`). Whereas with `rspec`, the test suite runs to
+completion and is then output to the terminal. I'm still investigating
+streaming the `rspec` results.

rails/filter-active-storage-blobs-to-only-images.md

@@ -0,0 +1,30 @@
+# Filter ActiveStorage Blobs To Only Images
+
+If your Rails app is using `ActiveStorage` for both images and ActionMailbox
+emails, then you're going to have a mix of both in the `active_storage_blobs`
+table.
+
+```sql
+> select id, filename, content_type from active_storage_blobs limit 2;
+
+| id | filename           | content_type   |
+|----|--------------------|----------------|
+|  1 | shirt-brothers.jpg | image/jpeg     |
+|  2 | message.eml        | message/rfc822 |
+```
+
+In that case, you are going to want to make sure that any part of your system
+that only cares to deal with images filters down to only blobs where the
+`content_type` is one that you care about.
+
+I expect that there might be a couple different image `content_type` values
+that my system handles, so I filter my `active_storage_blobs` like so:
+
+
+```ruby
+@images =
+  ActiveStorage::Blob
+    .where(content_type: %w[image/jpeg image/png image/gif image/webp])
+    .order(created_at: :desc)
+    .first(10)
+```