1 files changed, 27 insertions, 0 deletions
diff --git a/app/models/concerns/limitable.rb b/app/models/concerns/limitable.rb
new file mode 100644
index 00000000000..f320f54bb82
--- /dev/null
+++ b/app/models/concerns/limitable.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+module Limitable
+  extend ActiveSupport::Concern
+
+  included do
+    class_attribute :limit_scope
+    class_attribute :limit_name
+    self.limit_name = self.name.demodulize.tableize
+
+    validate :validate_plan_limit_not_exceeded, on: :create
+  end
+
+  private
+
+  def validate_plan_limit_not_exceeded
+    scope_relation = self.public_send(limit_scope) # rubocop:disable GitlabSecurity/PublicSend
+    return unless scope_relation
+
+    relation = self.class.where(limit_scope => scope_relation)
+
+    if scope_relation.actual_limits.exceeded?(limit_name, relation)
+      errors.add(:base, _("Maximum number of %{name} (%{count}) exceeded") %
+        { name: limit_name.humanize(capitalize: false), count: scope_relation.actual_limits.public_send(limit_name) }) # rubocop:disable GitlabSecurity/PublicSend
+    end
+  end
+end