Added examples for check box /radio button collections with inline errors to the README.md

Fixes #655

Author: donv

README.md

@@ -1423,6 +1423,8 @@ error will be displayed below the field. Here's an example:
 ```erb
 <%= bootstrap_form_for(@user_with_error) do |f| %>
   <%= f.email_field :email %>
+  <%= f.collection_radio_buttons :misc, Skill.all, :id, :name %>
+  <%= f.collection_check_boxes :preferences, [[1, 'Good'], [2, 'Bad']], :first, :second %>
   <%= f.fields_for :address do |af| %>
     <%= af.text_field :street %>
   <% end %>
@@ -1438,6 +1440,31 @@ Generated HTML:
     <input class="form-control is-invalid" id="user_email" name="user[email]" required="required" type="email" value="steve.example.com">
     <div class="invalid-feedback">is invalid</div>
   </div>
+  <div class="mb-3">
+    <label class="form-label" for="user_misc">Misc</label>
+    <div class="form-check">
+      <input checked class="form-check-input is-invalid" id="user_misc_1" name="user[misc]" type="radio" value="1">
+      <label class="form-check-label" for="user_misc_1">Mind reading</label>
+    </div>
+    <div class="form-check">
+      <input class="form-check-input is-invalid" id="user_misc_2" name="user[misc]" type="radio" value="2">
+      <label class="form-check-label" for="user_misc_2">Farming</label>
+      <div class="invalid-feedback">is invalid</div>
+    </div>
+  </div>
+  <input autocomplete="off" id="user_preferences" name="user[preferences][]" type="hidden" value="">
+  <div class="mb-3">
+    <label class="form-label" for="user_preferences">Preferences</label>
+    <div class="form-check">
+      <input checked class="form-check-input is-invalid" id="user_preferences_1" name="user[preferences][]" type="checkbox" value="1">
+      <label class="form-check-label" for="user_preferences_1">Good</label>
+    </div>
+    <div class="form-check">
+      <input class="form-check-input is-invalid" id="user_preferences_2" name="user[preferences][]" type="checkbox" value="2">
+      <label class="form-check-label" for="user_preferences_2">Bad</label>
+      <div class="invalid-feedback">is invalid</div>
+    </div>
+  </div>
   <div class="mb-3">
     <label class="form-label" for="user_address_attributes_street">Street</label>
     <input class="form-control is-invalid" id="user_address_attributes_street" name="user[address_attributes][street]" type="text" value="Bar">
@@ -1508,6 +1535,7 @@ Which outputs:
     <ul class="rails-bootstrap-forms-error-summary">
       <li>Email is invalid</li>
       <li>Misc is invalid</li>
+      <li>Preferences is invalid</li>
     </ul>
   </div>
 </form>
@@ -1546,6 +1574,7 @@ Which outputs:
   <ul class="rails-bootstrap-forms-error-summary">
     <li>Email is invalid</li>
     <li>Misc is invalid</li>
+    <li>Preferences is invalid</li>
   </ul>
 </form>
 ```

demo/app/assets/stylesheets/application.scss

@@ -1,6 +1,17 @@
 // @import "actiontext";
 
 label.required:after {
-  content:" *";
+  content: " *";
   color: red;
 }
+
+.fragment {
+  @extend .border;
+  @extend .p-3;
+}
+
+form, .alert, .fragment {
+  > :last-child {
+    margin-bottom: 0 !important;
+  }
+}

demo/app/controllers/bootstrap_controller.rb

@@ -6,7 +6,7 @@ def form
   def fragment
     @erb = params[:erb]
 
-    @erb.prepend '<div class="p-3 border">'
+    @erb.prepend '<div class="fragment">'
     @erb << "</div>"
     load_models
     render inline: @erb, layout: "application" # rubocop: disable Rails/RenderInline
@@ -20,9 +20,10 @@ def load_models
     @address_with_error.errors.add(:street)
     @collection = [@address, @address_with_error]
     @user = User.new email: "[email protected]"
-    @user_with_error = User.new email: "steve.example.com", address: @address_with_error
+    @user_with_error = User.new email: "steve.example.com", address: @address_with_error, misc: 1, preferences: [1]
     @user_with_error.errors.add(:email)
     @user_with_error.errors.add(:misc)
+    @user_with_error.errors.add(:preferences)
     @users = [@user]
   end
 end

demo/app/models/user.rb

@@ -1,11 +1,7 @@
 class User < ApplicationRecord
   attr_accessor :remember_me
 
-  if Rails::VERSION::STRING >= "6.1"
-    serialize :preferences, coder: JSON
-  else
-    serialize :preferences, JSON
-  end
+  serialize :preferences, coder: JSON
 
   validates :email, presence: true, length: { minimum: 5 }
   validates :terms, acceptance: { accept: true }