Cron 作业中聚合的力量和成本效益

const resetlimitsforusers = async () => {
  const users = await user.find({ /* conditions to select users */ });

  for (const user of users) {
    if (user.plan.remaining_prompt_count < 3 || user.plan.remaining_page_count < 3) {
      user.plan.remaining_prompt_count = 3;
      user.plan.total_prompt_count = 3;
      // save updated plan
      await user.plan.save();
    }
  }
};

const resetPlanCounts = () => {
  cron.schedule('* * * * *', async () => {
    try {
      const twoMinutesAgo = new Date(Date.now() - 2 * 60 * 1000); // 2 minutes ago

      const usersWithRegisteredPlan = await User.aggregate([
        {
          $match: {
            createdAt: { $lte: twoMinutesAgo },
            plan: { $exists: true }
          }
        },
        {
          $lookup: {
            from: 'plans',
            localField: 'plan',
            foreignField: '_id',
            as: 'planDetails'
          }
        },
        {
          $unwind: '$planDetails'
        },
        {
          $match: {
            'planDetails.name': 'Registered',
            $or: [
              { 'planDetails.remaining_prompt_count': { $lt: 3 } },
              { 'planDetails.remaining_page_count': { $lt: 3 } }
            ]
          }
        },
        {
          $project: {
            planId: '$planDetails._id'
          }
        }
      ]);

      const planIds = usersWithRegisteredPlan.map(user => user.planId);

      if (planIds.length > 0) {
        const { modifiedCount } = await Plan.updateMany(
          { _id: { $in: planIds } },
          { $set: { remaining_prompt_count: 3, total_prompt_count: 3, remaining_page_count: 3, total_page_count: 3 } }
        );

        console.log(`${modifiedCount} plans reset for "Registered" users.`);
      } else {
        console.log('No plans to reset for today.');
      }
    } catch (error) {
      console.error('Error resetting plan counts:', error);
    }
  });
};