Extract component to add/remove admin/mod/manager

We remove some duplication by doing so.

app/components/admin/roles/table_actions_component.html.erb

@@ -0,0 +1,7 @@
+<% if already_has_role? %>
+  <%= render Admin::TableActionsComponent.new(record, actions: actions) %>
+<% else %>
+  <%= render Admin::TableActionsComponent.new(actions: []) do %>
+    <%= link_to add_user_text, add_user_path, method: :post, class: "button success expanded" %>
+  <% end %>
+<% end %>

app/components/admin/roles/table_actions_component.rb

@@ -0,0 +1,30 @@
+class Admin::Roles::TableActionsComponent < ApplicationComponent
+  attr_reader :record, :actions
+
+  def initialize(record, actions: [:destroy])
+    @record = record
+    @actions = actions
+  end
+
+  private
+
+    def role
+      record.class.name.tableize
+    end
+
+    def already_has_role?
+      record.persisted?
+    end
+
+    def add_user_text
+      t("admin.#{role}.#{role.singularize}.add")
+    end
+
+    def add_user_path
+      {
+        controller: "admin/#{role}",
+        action: :create,
+        user_id: record.user
+      }
+    end
+end