Make ban UI more intuitive when a user is already banned

app/models/user.rb

@@ -49,7 +49,7 @@ class User < ApplicationRecord
   has_one :profile, dependent: :destroy
   has_one :theme, dependent: :destroy
 
-  has_many :user_bans, dependent: :destroy
+  has_many :bans, class_name: 'UserBan', dependent: :destroy
   has_many :banned_users, class_name: 'UserBan',
                           foreign_key: 'banned_by_id',
                           dependent: :nullify
@@ -224,11 +224,11 @@ class User < ApplicationRecord
   # endregion
 
   def banned?
-    self.user_bans.current.any?
+    self.bans.current.any?
   end
 
   def unban
-    self.user_bans.current.update!(expires_at: DateTime.now)
+    self.bans.current.update!(expires_at: DateTime.now)
   end
 
   # Bans a user.
@@ -237,7 +237,7 @@ class User < ApplicationRecord
   # @param reason [String] Reason for the ban. This is displayed to the user.
   # @param banned_by [User] User who instated the ban
   def ban(duration, duration_unit = 'hours', reason = nil, banned_by = nil)
-    self.user_bans.create(expires_at: expiry, reason: reason, banned_by: banned_by)
+    self.bans.create(expires_at: expiry, reason: reason, banned_by: banned_by)
   end
 
   def can_export?

app/views/modal/_ban.haml

@@ -1,3 +1,4 @@
+- current_ban = user.bans.current.first
 .modal.fade#modal-ban{ aria: { hidden: true, labelledby: 'modal-ban-label' }, role: :dialog, tabindex: -1 }
   .modal-dialog
     .modal-content
@@ -9,6 +10,7 @@
           %span.sr-only Close
       = bootstrap_form_tag(url: '/mod/ban', html: { method: :post, novalidate: :novalidate }) do |f|
         = f.hidden_field :user, value: user.screen_name
+        - if current_ban.nil?
           .modal-body#ban-control-super
             = f.check_box :ban, label: t('views.modal.bancontrol.ban'), checked: user.banned?
             #ban-controls{ style: user.banned? ? '' : 'display: none' }
@@ -24,3 +26,22 @@
           .modal-footer
             %button.btn.btn-default{ name: 'stop-time', type: :button, data: { dismiss: :modal } }= t 'views.actions.close'
             = f.submit t('views.modal.bancontrol.hammertime'), class: 'btn btn-primary', name: 'hammer-time'
+        - else
+          = f.hidden_field :ban, value: '0'
+          .modal-body#ban-control-super
+            - if current_ban.expires_at.nil?
+              This user is currently permanently banned for
+              %strong= current_ban.reason
+            - else
+              This user is currently banned until
+              %strong= current_ban.expires_at
+              for
+              %strong= current_ban.reason
+            - if current_ban.banned_by.present?
+              %br
+              This ban was instated by
+              %strong= current_ban.banned_by.safe_name
+              on
+              %strong= current_ban.created_at
+          .modal-footer
+            = f.submit 'Unban', class: 'btn btn-primary', name: 'hammer-time'