Add Use IRB And Ruby Flags With Rails Console as a Rails TIL

rails/use-irb-and-ruby-flags-with-rails-console.md

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+# Use IRB And Ruby Flags With Rails Console
+
+The `rails console` command only accepts two flags `--environment` and
+`--[no-]sandbox`. However, the `rails console` is built on top of IRB and Ruby,
+so it can accept flags that those commands understand.
+
+You can't pass an IRB flag directly to `rails console` though because it
+doesn't consider those part of its repertoire.
+
+```bash
+$ rails console --sandbox -r './vendor/setup_records.rb'
+```
+
+It will put the session in sandbox mode, but it doesn't know what to do with
+`-r`.  We have to explicitly separate its flags from flags that should be
+passed through. This is done with the `--` CLI convention.
+
+```bash
+$ rails console --sandbox -- -r './vendor/setup_records.rb'
+```
+
+Everything after the `--` gets passed along to IRB.