Lookup power

 const pipeline: object[] = [
            {
                $match: {
                    active: true,
                    platformId: new mongodb.ObjectID(platformId),
                },
            },
            {
                $lookup: {
                    from: 'retailers',
                    localField: 'retailerId',
                    foreignField: '_id',
                    as: 'retailer',
                },
            },
            {
                $unwind: {
                    path: '$retailer',
                }
            },
            {
                $match: {
                    'retailer.active': true,
                }
            },
            {
                $lookup: {
                    from: 'dictionaryretaileroptions',
                    localField: 'optionListId',
                    foreignField: '_id',
                    as: 'optionList',
                },
            },
            {
                $lookup: {
                    from: 'coupons',
                    let: {'retailerOnPlatformId': '$_id'},
                    pipeline: [
                        {
                            $match: {
                                $expr: {
                                    $and: [
                                        {$eq: ['$retailerOnPlatformId', '$$retailerOnPlatformId']},
                                        {$eq: ['$active', true]},
                                        {$lte:['$dateStart',  currDate]},
                                        {$gte:['$dateEnd',  currDate]},
                                    ]
                                }
                            }
                        }
                    ],
                    as: 'coupons',
                },
            },
            {
                $match: {
                    ...match,
                },
            },
            {
                $limit: limit
            },
            {
                $project: {
                    slug: 1,
                    imageText: 1,
                    retailerId: '$retailer._id',
                    name: '$retailer.name',
                    alternativeName: '$retailer.alternativeName',
                    image: '$retailer.image',
                    categoryListId: '$retailer.categoryListId',
                    sliderImage: 1,
                    // bannerImage: 1,
                    landingsSort: 1,
                    couponCount: {$size: '$coupons'},
                },
            },
            // {$match: {'couponCount': {$gt: 0}}}
        ];