private String editChannelPermission(Operation op, Permission permission, IChannel channel) { if (channel.isPrivate()) { throw new IllegalArgumentException("No private channels allowed!"); } DiscordGuild g = cacheService .findGuildById(channel.getGuild().getID()) .orElseGet(() -> new DiscordGuild(channel.getGuild())); g = cacheService.saveGuild(g); DiscordChannel ch = cacheService.findChannelById(channel.getID()).orElseGet(() -> new DiscordChannel(channel)); ch.setGuild(g); g.getChannels().add(ch); changePermission(op, permission, ch); ch = cacheService.saveChannel(ch); cacheService.saveGuild(g); log.info("Saving new permission data: {}", g); permissionService.evict(); return String.format( "Modified channel %s: %s permission %s", ch.getName(), op.name().toLowerCase(), permission.getName()); }