add user_by_name method

app/models/user.rb

@@ -72,6 +72,19 @@ def name
              identifiers:)
   }
 
+  def self.by_name(full_name)
+    name_parts = full_name.split
+    first_name = name_parts.first
+    last_name_parts = name_parts[1..].join(' ')
+    query = User.where('unaccent(lower(first_name)) = unaccent(lower(?))', first_name.downcase)
+
+    last_names_condition = last_name_parts.split.map do |part|
+      "unaccent(lower(last_name)) LIKE unaccent(lower('%#{part}%'))"
+    end.join(' OR ')
+
+    query.where(last_names_condition)
+  end
+
   def should_generate_new_friendly_id?
     true
   end

spec/models/user_spec.rb

@@ -103,4 +103,19 @@
       expect(User.by_external_identifier(user.email).first).to eql(user)
     end
   end
+
+  context '#by_name' do
+    let(:full_name) { 'Pedro Vieira Guimarães' }
+
+    context 'when the user exists' do
+      it 'returns the user by the name' do
+        user = create(:user, first_name: 'Pedro', last_name: 'Vieira')
+        expect(User.by_name(full_name).first).to eql(user)
+      end
+    end
+
+    it 'returns an active record query' do
+      expect(User.by_name(full_name)).to be_an(ActiveRecord::Relation)
+    end
+  end
 end