Update custom_fields.md

excid3 · Aug 16, 2021 · 1796e64 · 1796e64
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 ## Custom Fields
 You can generate a custom field with:
 
+```bash
 rails g madmin:field Custom
+```
+
 This will create a CustomField class in app/madmin/fields/custom_field.rb And the related views:
 
+```bash
 # -> app/views/madmin/fields/custom_field/_form.html.erb
 # -> app/views/madmin/fields/custom_field/_index.html.erb
 # -> app/views/madmin/fields/custom_field/_show.html.erb
+```
+
 You can then use this field on our resource:
 
+```ruby
 class PostResource < Madmin::Resource
   attribute :title, field: CustomField
-end
+end
+```