Has anyone seen the ruling, or know on what basis the court ruled? I'd be very surprised (and pleased!) if the court found a Second Amendment violation. My guess is that they were either upholding some LA RKBA statute, or found some procedural problems with how the policy was carried out.
Considering it was Federal Court, it's unlikely to be a LA statute, or even the RKBA provision of the LA constitution, which is slightly clearer than the second amendment, stating the right belongs to "each citizen", rather than "the people"