Use ILIKE/LIKE for Issuable.search and full_search

app/models/concerns/issuable.rb

@@ -61,12 +61,29 @@ module Issuable
   end
 
   module ClassMethods
+    # Searches for records with a matching title.
+    #
+    # 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(title) like :query", query: "%#{query.downcase}%")
+      where(arel_table[:title].matches("%#{query}%"))
     end
 
+    # Searches for records with a matching title or description.
+    #
+    # This method uses ILIKE on PostgreSQL and LIKE on MySQL.
+    #
+    # query - The search query as a String
+    #
+    # Returns an ActiveRecord::Relation.
     def full_search(query)
-      where("LOWER(title) like :query OR LOWER(description) like :query", query: "%#{query.downcase}%")
+      t = arel_table
+      pattern = "%#{query}%"
+
+      where(t[:title].matches(pattern).or(t[:description].matches(pattern)))
     end
 
     def sort(method)

spec/models/concerns/issuable_spec.rb

@@ -32,9 +32,54 @@ describe Issue, "Issuable" do
   describe ".search" do
     let!(:searchable_issue) { create(:issue, title: "Searchable issue") }
 
-    it "matches by title" do
+    it 'returns notches with a matching title' do
+      expect(described_class.search(searchable_issue.title)).
+        to eq([searchable_issue])
+    end
+
+    it 'returns notes with a partially matching title' do
       expect(described_class.search('able')).to eq([searchable_issue])
     end
+
+    it 'returns notes with a matching title regardless of the casing' do
+      expect(described_class.search(searchable_issue.title.upcase)).
+        to eq([searchable_issue])
+    end
+  end
+
+  describe ".full_search" do
+    let!(:searchable_issue) do
+      create(:issue, title: "Searchable issue", description: 'kittens')
+    end
+
+    it 'returns notches with a matching title' do
+      expect(described_class.full_search(searchable_issue.title)).
+        to eq([searchable_issue])
+    end
+
+    it 'returns notes with a partially matching title' do
+      expect(described_class.full_search('able')).to eq([searchable_issue])
+    end
+
+    it 'returns notes with a matching title regardless of the casing' do
+      expect(described_class.full_search(searchable_issue.title.upcase)).
+        to eq([searchable_issue])
+    end
+
+    it 'returns notches with a matching description' do
+      expect(described_class.full_search(searchable_issue.description)).
+        to eq([searchable_issue])
+    end
+
+    it 'returns notes with a partially matching description' do
+      expect(described_class.full_search(searchable_issue.description)).
+        to eq([searchable_issue])
+    end
+
+    it 'returns notes with a matching description regardless of the casing' do
+      expect(described_class.full_search(searchable_issue.description.upcase)).
+        to eq([searchable_issue])
+    end
   end
 
   describe "#today?" do