CODEWITHSUNDEEP
javascriptfirebasefirebase-realtime-databasegoogle-cloud-functions
Arjun Ram
Arjun Ram

Reputation: 369

How to periodically and programmatically trigger timer-based methods in Firebase Functions?

I'm building a crowd-funding app and every campaign on my app has a target date. How do I write a function to automatically delete that campaign or shift it elsewhere once the target date is reached?

More specifically, I want to move the campaign from ref('/Fund/{Campaign_ID}') to ref('/Timed_out/{Campaign_ID}').

PS: Please don't suggest manual cron-jobs. It would be impossible for me to keep track of who starts a campaign if the number of users and volume of campaigns grows.

My database in JSON(The important bit):

{
  "Fund" : {
    "-LEEy7uxXEeI4AJuePoB" : {
      "amount_funded" : 1400000,
      "artist_name" : "Sean Roldan and Friends",
      "genre" : "Indian Blues and Jazz",
      "image_url" : "https://firebasestorage.googleapis.com/v0/b/artcall-f8f1a.appspot.com/o/profile_images%2Fthumbs%2Fseanroldan.jpg?alt=media&token=6414d8d6-e8a8-487e-baf3-0d36d017a205",
      "percent_funded" : 0,
      "perf_location" : "Chennai",
      "reward_amt" : 6000,
      "target_amount" : 1750000,
      "target_date" : 1566568176731,
      "time_left" : 1566568176731,
      "total_backers" : 0
    }
  },
  "Fund_Project_Request" : {
    "-LEEy7uxXEeI4AJuePoB" : {
      "as123132" : 2,
      "asd123132" : 2,
      "asdf123asdf21" : 2
    }
  },
  "Loyalty_Points" : {
    "value" : 3000
  },

Firebase Screenshot

Upvotes: 0

Views: 342

Answers (1)

Frank van Puffelen
Frank van Puffelen

Reputation: 600006

You can use a single cron-job to trigger at an interval, and then scan for expired data. In fact, that's the most common way to implement time-to-live on Firebase at the moment.

Upvotes: 1

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