Gab Social. All are welcome.

app/policies/group_policy.rb

@@ -0,0 +1,58 @@
+# frozen_string_literal: true
+
+class GroupPolicy < ApplicationPolicy
+  def update?
+    check_archive!
+    is_group_admin?
+  end
+
+  def destroy?
+    check_archive!
+    is_group_admin?
+  end
+
+  def approve_status?
+    check_archive!
+    is_group_admin?
+  end
+
+  def destroy_status?
+    check_archive!
+    is_group_admin?
+  end
+
+  def join?
+    check_archive!
+    raise GabSocial::ValidationError, "User is already a member of this group." if is_member?
+
+    return true
+  end
+
+  def leave?
+    check_archive!
+    raise GabSocial::ValidationError, "Group member account not found." if not is_member?
+    
+    is_account_the_only_admin = (is_group_admin? and record.group_accounts.where(role: :admin).count == 1)
+    raise GabSocial::ValidationError, "This is the last admin of this group." if is_account_the_only_admin
+
+    return true
+  end
+
+  def update_account?
+    is_group_admin?
+  end
+
+  private
+
+  def is_member?
+    record.group_accounts.where(account_id: current_account.id).exists?
+  end
+
+  def is_group_admin?
+    record.group_accounts.where(account_id: current_account.id, role: :admin).exists?
+  end
+
+  def check_archive!
+    raise GabSocial::ValidationError, "This group has been archived." if record.is_archived
+  end
+end