From: "austin (Austin Ziegler) via ruby-core" Date: 2025-06-03T02:14:59+00:00 Subject: [ruby-core:122384] [Ruby Bug#21392] Data classes do not allow overriding #inspect Issue #21392 has been updated by austin (Austin Ziegler). nobu (Nobuyoshi Nakada) wrote in #note-5: > austin (Austin Ziegler) wrote in #note-3: > > You are correct (and I should have known better; I have unit tests proving this). > > What unit tests? In my feature branch where I'm converting to Data classes. > > You can define `pretty_print` for IRB. > > ```ruby > def pretty_print(q) > q.text "CIELAB" > q.breakable > q.group 2, "[", "]" do > q.text "%.4f%%" % l > q.breakable > q.text "%.4f" % a > q.breakable > q.text "%.4f" % b > end > end > ``` This is the problem, of course, with having maintained something backwards compatible (Color is currently _nominally_ valid for 1.8) as long as I have. I wasn't aware that there was a new call for defining a pretty print, because IRB *used* to fall back to `inspect`. However, `Data` classes presumably define a pretty printer and overrides `#inspect` within IRB. This is good to know, and I'll define a `pretty_print` method. This can be closed. ---------------------------------------- Bug #21392: Data classes do not allow overriding #inspect https://bugs.ruby-lang.org/issues/21392#change-113532 * Author: austin (Austin Ziegler) * Status: Assigned * Assignee: ima1zumi (Mari Imaizumi) * ruby -v: 3.4.4 * Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN ---------------------------------------- I'm preparing a new version of Color and I have decided to make all of the colour classes Data classes. However, it does not appear that `#inspect` can be overridden: ```ruby module Color CIELAB = Data.define(:l, :a, :b) do def inspect "CIELAB [%.4f%% %.4f %.4f]" % [l, a, b] end end end p Color::CIELAB[1,2,3] # Expected => CIELAB[1.000% 2.000 3.000] # Actual # ``` This feels like it should be permitted. -- https://bugs.ruby-lang.org/ ______________________________________________ ruby-core mailing list -- ruby-core@ml.ruby-lang.org To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/