public async Task ConfigureDefaultPrefixesAsync(CommandContext ctx,
                                                            [RemainingText, Description("Whether default prefixes are to be enabled.")] bool enable)
            {
                var gid  = (long)ctx.Guild.Id;
                var gpfx = this.Database.Prefixes.SingleOrDefault(x => x.GuildId == gid);

                if (gpfx == null)
                {
                    gpfx = new DatabasePrefix
                    {
                        GuildId       = gid,
                        Prefixes      = new string[] { },
                        EnableDefault = enable
                    };
                    this.Database.Prefixes.Add(gpfx);
                }
                else
                {
                    gpfx.EnableDefault = enable;
                    this.Database.Prefixes.Update(gpfx);
                }

                await this.Database.SaveChangesAsync();

                await ctx.RespondAsync($"{DiscordEmoji.FromName(ctx.Client, ":msokhand:")} Setting saved.");
            }
            public async Task AddPrefixAsync(CommandContext ctx,
                                             [Description("Prefix to add to this guild's prefixes.")] string prefix)
            {
                var gid  = (long)ctx.Guild.Id;
                var gpfx = this.Database.Prefixes.SingleOrDefault(x => x.GuildId == gid);

                if (gpfx?.EnableDefault != false && this.Bot.Configuration.Discord.DefaultPrefixes.Contains(prefix))
                {
                    await ctx.RespondAsync($"{DiscordEmoji.FromName(ctx.Client, ":msraisedhand:")} Cannot add default prefix.");

                    return;
                }

                if (gpfx == null)
                {
                    gpfx = new DatabasePrefix
                    {
                        GuildId       = gid,
                        Prefixes      = new[] { prefix },
                        EnableDefault = true
                    };
                    this.Database.Prefixes.Add(gpfx);
                }
                else if (!gpfx.Prefixes.Contains(prefix))
                {
                    gpfx.Prefixes = gpfx.Prefixes.Concat(new[] { prefix }).ToArray();
                    this.Database.Prefixes.Update(gpfx);
                }

                await this.Database.SaveChangesAsync();

                await ctx.RespondAsync($"{DiscordEmoji.FromName(ctx.Client, ":msokhand:")} Prefix added.");
            }