Make Namespace.search case-insensitive

This ensures searching namespaces works exactly the same as searching
for any other resource.

app/models/namespace.rb

@@ -52,8 +52,18 @@ class Namespace < ActiveRecord::Base
       find_by("lower(path) = :path OR lower(name) = :path", path: path.downcase)
     end
 
+    # Searches for namespaces 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("name LIKE :query OR path LIKE :query", query: "%#{query}%")
+      t = arel_table
+      pattern = "%#{query}%"
+
+      where(t[:name].matches(pattern).or(t[:path].matches(pattern)))
     end
 
     def clean_path(path)

spec/models/namespace_spec.rb

@@ -41,13 +41,32 @@ describe Namespace, models: true do
     it { expect(namespace.human_name).to eq(namespace.owner_name) }
   end
 
-  describe :search do
-    before do
-      @namespace = create :namespace
+  describe '#search' do
+    let(:namespace) { create(:namespace) }
+
+    it 'returns namespaces with a matching name' do
+      expect(described_class.search(namespace.name)).to eq([namespace])
+    end
+
+    it 'returns namespaces with a partially matching name' do
+      expect(described_class.search(namespace.name[0..2])).to eq([namespace])
+    end
+
+    it 'returns namespaces with a matching name regardless of the casing' do
+      expect(described_class.search(namespace.name.upcase)).to eq([namespace])
+    end
+
+    it 'returns namespaces with a matching path' do
+      expect(described_class.search(namespace.path)).to eq([namespace])
     end
 
-    it { expect(Namespace.search(@namespace.path)).to eq([@namespace]) }
-    it { expect(Namespace.search('unknown')).to eq([]) }
+    it 'returns namespaces with a partially matching path' do
+      expect(described_class.search(namespace.path[0..2])).to eq([namespace])
+    end
+
+    it 'returns namespaces with a matching path regardless of the casing' do
+      expect(described_class.search(namespace.path.upcase)).to eq([namespace])
+    end
   end
 
   describe :move_dir do