FIX: Truncate existing user status to 100 chars (#20044)

This commits adds a database migration to limit the user status to 100
characters, limits the user status in the UI and makes sure that the
emoji is valid.

Follow up to commit b6f75e231c.

app/assets/javascripts/discourse/app/templates/components/user-status-picker.hbs

@@ -19,6 +19,7 @@
     <Input
       class="user-status-description"
       @value={{@status.description}}
+      maxlength="100"
       placeholder={{i18n "user_status.what_are_you_doing"}}
       {{on "input" this.setDefaultEmoji}}
       {{on "focus" this.focus}}

app/models/user_status.rb

@@ -15,7 +15,7 @@ class UserStatus < ActiveRecord::Base
   end
 
   def emoji_exists
-    emoji && Emoji.exists?(emoji)
+    errors.add(:emoji, :invalid) if emoji && !Emoji.exists?(emoji)
   end
 
   def ends_at_greater_than_set_at

db/migrate/20230127173249_truncate_user_status_to_100_characters.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+class TruncateUserStatusTo100Characters < ActiveRecord::Migration[7.0]
+  def up
+    execute "UPDATE user_statuses SET description = left(description, 100)"
+    execute "UPDATE user_statuses SET emoji = left(emoji, 100)"
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  end
+end

spec/requests/user_status_controller_spec.rb

@@ -76,8 +76,12 @@ RSpec.describe UserStatusController do
       end
 
       it "validates emoji" do
-        put "/user-status.json", params: { description: "invalid_emoji_name" }
-        expect(response.status).to eq(400)
+        put "/user-status.json",
+            params: {
+              emoji: "invalid_emoji_name",
+              description: "off to dentist",
+            }
+        expect(response.status).to eq(422)
       end
 
       it "limits description’s length" do

spec/requests/users_controller_spec.rb

@@ -2871,7 +2871,7 @@ RSpec.describe UsersController do
         end
 
         it "doesn't clear user status if it wasn't sent in the payload" do
-          new_status = { emoji: "off to dentist", description: "tooth" }
+          new_status = { emoji: "tooth", description: "off to dentist" }
           user.set_status!(new_status[:description], new_status[:emoji])
           user.reload