DEV: Prefer .pluck_first over .pluck.first (#13607)

lib/topic_query.rb

@@ -335,7 +335,7 @@ class TopicQuery
       staff: user.staff?
     )
 
-    first_unread_pm_at = UserStat.where(user_id: user.id).pluck(:first_unread_pm_at).first
+    first_unread_pm_at = UserStat.where(user_id: user.id).pluck_first(:first_unread_pm_at)
     list = list.where("topics.updated_at >= ?", first_unread_pm_at) if first_unread_pm_at
     create_list(:private_messages, {}, list)
   end
@@ -1013,7 +1013,7 @@ class TopicQuery
       if params[:my_group_ids].present?
         GroupUser.where(user_id: @user.id, group_id: params[:my_group_ids]).minimum(:first_unread_pm_at)
       else
-        UserStat.where(user_id: @user.id).pluck(:first_unread_pm_at).first
+        UserStat.where(user_id: @user.id).pluck_first(:first_unread_pm_at)
       end
 
     query = query.where("topics.updated_at >= ?", first_unread_pm_at) if first_unread_pm_at

script/import_scripts/base/lookup_container.rb

@@ -59,7 +59,7 @@ module ImportScripts
 
     def find_username_by_import_id(import_id)
       user_id = user_id_from_imported_user_id(import_id)
-      User.where(id: user_id).pluck(:username).first if user_id.present?
+      User.where(id: user_id).pluck_first(:username) if user_id.present?
     end
 
     # Get the Discourse Category id based on the id of the source category

spec/helpers/application_helper_spec.rb

@@ -406,7 +406,7 @@ describe ApplicationHelper do
     end
 
     it 'returns two color scheme link tags when dark mode is enabled' do
-      SiteSetting.default_dark_mode_color_scheme_id = ColorScheme.where(name: "Dark").pluck(:id).first
+      SiteSetting.default_dark_mode_color_scheme_id = ColorScheme.where(name: "Dark").pluck_first(:id)
       cs_stylesheets = helper.discourse_color_scheme_stylesheets
 
       expect(cs_stylesheets).to include("(prefers-color-scheme: dark)")
@@ -462,7 +462,7 @@ describe ApplicationHelper do
         helper.request.env[Auth::DefaultCurrentUserProvider::CURRENT_USER_KEY] = user
         @new_cs = Fabricate(:color_scheme, name: 'Custom Color Scheme')
 
-        SiteSetting.default_dark_mode_color_scheme_id = ColorScheme.where(name: "Dark").pluck(:id).first
+        SiteSetting.default_dark_mode_color_scheme_id = ColorScheme.where(name: "Dark").pluck_first(:id)
       end
 
       it "returns no dark scheme stylesheet when user has disabled that option" do

spec/models/topic_link_spec.rb

@@ -58,8 +58,8 @@ describe TopicLink do
       TopicLink.extract_from(post)
 
       # we have a special rule for images title where we pull them out of the filename
-      expect(topic.topic_links.where(url: png).pluck(:title).first).to eq(png_title)
-      expect(topic.topic_links.where(url: non_png).pluck(:title).first).to eq("amazing")
+      expect(topic.topic_links.where(url: png).pluck_first(:title)).to eq(png_title)
+      expect(topic.topic_links.where(url: non_png).pluck_first(:title)).to eq("amazing")
 
       expect(topic.topic_links.pluck(:url)).to contain_exactly(
         png,