Use ILIKE/LIKE for searching notes

app/models/note.rb

@@ -105,8 +105,18 @@ class Note < ActiveRecord::Base
       [:discussion, type.try(:underscore), id, line_code].join("-").to_sym
     end
 
+    # Searches for notes matching the given query.
+    #
+    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+    #
+    # query - The search query as a String.
+    #
+    # Returns an ActiveRecord::Relation.
     def search(query)
-      where("LOWER(note) like :query", query: "%#{query.downcase}%")
+      table   = Note.arel_table
+      pattern = "%#{query}%"
+
+      where(table[:note].matches(pattern))
     end
 
     def grouped_awards

spec/models/note_spec.rb

@@ -140,10 +140,16 @@ describe Note, models: true do
     end
   end
 
-  describe :search do
-    let!(:note) { create(:note, note: "WoW") }
+  describe '.search' do
+    let(:note) { create(:note, note: 'WoW') }
 
-    it { expect(Note.search('wow')).to include(note) }
+    it 'returns notes with matching content' do
+      expect(described_class.search(note.note)).to eq([note])
+    end
+
+    it 'returns notes with matching content regardless of the casing' do
+      expect(described_class.search('WOW')).to eq([note])
+    end
   end
 
   describe :grouped_awards do