Use true/false for boolean value in form

app/models/username_block.rb

@@ -35,13 +35,7 @@ class UsernameBlock < ApplicationRecord
 
   normalizes :normalized_username, with: ->(value) { value.downcase.gsub(Regexp.union(HOMOGLYPHS.keys), HOMOGLYPHS) }
 
-  def comparison
-    exact? ? 'equals' : 'contains'
-  end
-
-  def comparison=(val)
-    self.exact = val == 'equals'
-  end
+  alias_attribute :comparison, :exact
 
   def self.matches?(str, allow_with_approval: false)
     matches_exactly(str).or(matches_partially(str)).where(allow_with_approval: allow_with_approval).any?

app/views/admin/username_blocks/_form.html.haml

@@ -7,9 +7,9 @@
   = form.input :comparison,
                as: :select,
                wrapper: :with_block_label,
-               collection: %w(equals contains),
+               collection: [[:equals, true], [:contains, false]],
                include_blank: false,
-               label_method: ->(type) { I18n.t(type, scope: 'admin.username_blocks.comparison') }
+               label_method: ->(type) { I18n.t(type.first, scope: 'admin.username_blocks.comparison') }
 
 .fields-group
   = form.input :allow_with_approval,

spec/requests/admin/username_blocks_spec.rb

@@ -24,13 +24,23 @@ RSpec.describe 'Admin Username Blocks' do
         .to have_http_status(400)
     end
 
-    it 'creates a username block' do
-      post admin_username_blocks_path(username_block: { username: 'banana', comparison: 'contains', allow_with_approval: '0' })
+    context 'with valid params' do
+      subject { post admin_username_blocks_path(username_block: { username: 'banana', comparison: 'false', allow_with_approval: '0' }) }
 
-      expect(response)
-        .to redirect_to(admin_username_blocks_path)
-      expect(UsernameBlock.find_by(username: 'banana'))
-        .to_not be_nil
+      it 'creates a username block' do
+        expect { subject }
+          .to change(UsernameBlock, :count).by(1)
+
+        expect(response)
+          .to redirect_to(admin_username_blocks_path)
+        expect(UsernameBlock.last)
+          .to be_present
+          .and have_attributes(
+            allow_with_approval: false,
+            exact: false,
+            username: 'banana'
+          )
+      end
     end
   end