---
title: Avoid double bookings with Checkout Session expiration - clearbnb - part 16
slug: avoid-double-bookings-with-checkout-session-expiration-clearbnb-part-16
published_at: 2022-03-14 10:00:27 +0000
updated_at: 2026-03-04 20:13:40 +0000
summary: 
description: In this episode, we&#39;ll talk about ways to avoid _some_ double bookings with the Checkout Session expiration feature. #rails #rubyonrails
tags: [cjav_dev, web development tutorials, web development for beginners, vim, ruby, rails, javascript]
views: 870
author: CJ Avilla
url: https://www.cjav.dev/videos/avoid-double-bookings-with-checkout-session-expiration-clearbnb-part-16
youtube_url: https://www.youtube.com/watch?v=WIYJtzIGYh0
youtube_id: WIYJtzIGYh0
embed_url: https://www.youtube.com/embed/WIYJtzIGYh0
thumbnail_url: https://i.ytimg.com/vi/WIYJtzIGYh0/hqdefault.jpg
type: video
---

# Avoid double bookings with Checkout Session expiration - clearbnb - part 16

*Published: March 14, 2022*
*Views: 870*

## Watch

[Watch on YouTube](https://www.youtube.com/watch?v=WIYJtzIGYh0)

[![Avoid double bookings with Checkout Session expiration - clearbnb - part 16](https://i.ytimg.com/vi/WIYJtzIGYh0/hqdefault.jpg)](https://www.youtube.com/watch?v=WIYJtzIGYh0)

## Description

In this episode, we&#39;ll talk about ways to avoid _some_ double bookings with the Checkout Session expiration feature.
#rails #rubyonrails

## Transcript

what&#39;s up everyone this is part 15 of clearbnb where we&#39;re rebuilding a vacation rental marketplace with rails in this episode we&#39;re going to talk about expiring those checkout sessions so that if someone tries to go pay after they&#39;re reserving and they don&#39;t actually end up paying that we don&#39;t keep the calendar blocked so let&#39;s jump in all right so from a listing view we can click on reserve and then we can pick some dates that we want to potentially reserve so we could say we want to book from 310 to 311 and we can click on reserve but it says sorry this date is already booked for this range so let&#39;s make it a little bit easier and when we&#39;re on this view let&#39;s render out all of the existing bookings for this listing so we&#39;re going to go to the reservation new form and right above here we&#39;ll just make a ul and this ul is going to go over a list of calendar events and for each calendar event um we want to print out just like the status of the calendar event and then maybe the status of the related uh you know um uh reservation too if there is a reservation so we&#39;ll say the start date the end date the calendar event status um and then if there is a reservation so we&#39;re going to say try reservation dot try status so not all calendar events have reservations related to them so it&#39;s possible that we have some that um that are just blocked on the calendar uh okay so we&#39;re saying uh no method each for no class that&#39;s because calendar events doesn&#39;t actually exist yet in this controller action so we&#39;re gonna go to the reservations controller and look at the new action and down here we want to say at calendar events is at listing.calendar events does the listing actually have calendar events so the the calendar event belongs to a listing so there is an a listing id in the calendar event database table and so we should be able to say has many calendar events here and then we can refresh this page all right cool so now we see that there are several calendar events um and they&#39;re reserved we&#39;ve got like some that are booked i&#39;m actually just going to go in the database here and delete all the reservations and related calendar events reservation dot destroy all and um calendar event dot destroy all just so that we&#39;re starting fresh okay so if we go from uh you know the 10th to the 11th and click on reserve we&#39;re redirected to checkout we can go through the whole process so let&#39;s create a new reservation here we&#39;ll click book this should be good and okay we&#39;ve got a booking uh from 310 to 311. now if we go back to our listing here when we go to reserve we should now see this from 310 to 311 it is reserved and the reservation is booked so now if we tried to book um from maybe like from the 12th to the 13th let&#39;s start the process so we&#39;ve started checking out here but let&#39;s say that if we wanted to like go back and we didn&#39;t actually like finish the the checkout process right now we have a calendar event that is that says reserved but the actual underlying reservation is pending so like the person never actually finished paying that guest never ended up paying but right now we can&#39;t actually like go and book like another guest could not come in here and book from the 12th to the 13th so if we tried to book that now it says undefined method each for null class because we have an error in our controller reservations controller so down here we also need a calendar events in the case that we fail all right start date is already booked for this range so we&#39;re not able to book it even though the reservation is just in this pending state i think i don&#39;t know i i think that might be fine i don&#39;t know like maybe we should let if if the guest is the same user and there&#39;s a pending reservation we should let them book over the top of it or something i don&#39;t know um but i wanted to show another feature which is a feature of checkout where you can expire a checkout session so when you&#39;re creating when we&#39;re creating the checkout session redirecting to that checkout page or the payment page we can set this expires at api parameter and we can pass in you know unix timestamp for when we want this session to expire so in the book listing like object that we created before we can say expiresat time.now or like one i think we can do like one dot hour to from now plus or like dot two i that should work to expire the checkout session in one hour and what happens is after you expire the checkout session there is a webhook event that will fire and we don&#39;t have that here but the checkout.session.expiredevent will fire um so we can take a look at the list of web hook event types here and inside of checkout session there&#39;s this one checkout.session.expired that will fire when a checkout session expires whether it&#39;s naturally because we&#39;re you know hitting the expiration time or because we&#39;ve explicitly expired the session so we can either like manually say hey this session that this person was going through they bailed out of it and we want to expire the session that so that someone else can get access to those dates or we can just set a time window that&#39;s the minimum is one hour which is a little bit tricky because we have to wait at least an hour before expiring the session but for now this will at least give us something that will fire in one hour we can go back and do some cleanup and such later but for now let&#39;s call that good and then go into our web hook handler so in our web hooks controller we&#39;re calling this eventjob.performlater so this is going to be in the event job where if the source is stripe then we attempt to handle the stripe event so we come down into here and we can add a new when block for the um for the checkout.session.expired event now when the checkout session expires we want to grab the related reservation and what i think yeah i guess we want to do this the same sort of error handling and then the status we want to update to is now going to be expired um so we might need to add that as another type over here on the reservation so yeah we&#39;re gonna add a new status here of expired and that&#39;ll be four okay so we have um yeah so if if the checkout session expires we&#39;re going to look up the reservation we&#39;re going to mark it as expired so that we can free up the dates right so what we need to do now is in order to get this test working we want to go into here and we want to restart our job handler and we want to restart rails okay so when uh all right so let&#39;s go let&#39;s go through the the process of checking out one more time so we&#39;re gonna say we&#39;re gonna book on the 14th to the 16th and we&#39;ll say reserve that creates a checkout session now this checkout session i can see the id in the url again that&#39;s also going to be stored on the reservation object but i&#39;m just going to grab it from the url here and go into the terminal and i&#39;m going to say stripe checkout sessions expire and i think this should expire the checkout session okay cool that marked the status as expired and we should have received a web hook notification to our web hooks controller event 177 and yeah checkout session expired is the event type cool so that should have marked our reservation as expired so if we look back at the reserve or the the list of bookings now now the the status of that reservation is expired so what we want to be able to do is now be able to book as another guest or as the same guest or whatever these dates from the 14th to the 16th but if we try to reserve that now it says this start date is already booked for this range or like this date is already booked right um so this is where it&#39;s going to get a little bit fancy on the um inside of our our validation logic for the calendar event so um that&#39;s that&#39;s kind of like how you handle expiration um we can probably go back and improve that a bit just to make it so that like um as you&#39;re uh like if you cancel out by going to the return url maybe we just like immediately expire that yeah i think that&#39;s what we want to do too but whatever we&#39;ll we&#39;ll use the event type and then also um what we need to do here is that in order for us to be able to book those expired or the times where the reservation was expired or cancelled in fact like um in our existing system you&#39;re unable to book where there&#39;s a cancelled reservation like we don&#39;t have the concept of being able to book over that we just have we&#39;re validating the start and end date and if they overlap then you&#39;re not able to book for that listing so what we need to do is add in some more logic into this validation that says only require that the start and end date don&#39;t overlap in the scope of the listing if the um if the related if if the status is blocked because it was manually blocked or if the status of the reservation is in the state of cancelled or expired or one of the other so if it&#39;s pending or if it&#39;s booked we want to block that otherwise we want to not not support it and so again we&#39;re using this like validates overlap uh reason this validates overlap um rubygem which was uh it&#39;s super handy and it has this query options parameter that we can use so query options and this is going to allow us to say we want to joins we want to add like a joins thing because we want to join it to reservations and then we want to have a where clause that will be kind of specific so we let&#39;s see our joins is going to be like left outer joins reservations as r or r on r dot id is equal to calendar events dot reservation id and then if r dot status is in um zero or one this is where it gets a little gnarly when we&#39;re using these um there&#39;s probably ways to do this with a rel or something fancy but because we&#39;re using this validates overlaps thing i just wanted to like write the query manually um so or the uh the status is so calendar events.status is equal to blocked so if the calendar event status is blocked or if the reservation or if the related reservations status is one of pending or booked then we want to disallow folks booking over this so let&#39;s see if we can get that working now so we&#39;ll refresh go back over here okay so then if we try to book this want okay um joins uh this should this always confuse me joins like the activerecord method or whatever is joins but the sql query thing is join i&#39;m using left outer join i&#39;m pretty sure i need to do an outer join because reservations is not strictly required for calendar events so that&#39;s why i&#39;m doing left outer is that like i want all the calendar events and then if there&#39;s a related reservation i want that too but i don&#39;t want to make it a hard requirement let&#39;s see if we return blah blah blah i&#39;ve spelled events wrong somewhere [Music] boom okay so we were able to book over those dates okay so let&#39;s see so if we try to reserve over a booked date so 310 to 311 310 to 311 this should fail good start date already taken and then if we try to book over 3 14 to 3 16 it should not let us because it&#39;s there&#39;s a pending one 3 14 2 3 16 that failed good good good and then we should be able to um yeah let&#39;s make a new event that is i don&#39;t know in the future here the 28th to the 31st reserve and then let&#39;s expire this one again using the stripe cli just passing in that id we end up with an expired booking we should have gotten like web hook events and such and now if we come back over here refresh the page and then click reserve now we see this expired one so now we should be able to book on 28 to 31 28 to 31 click reserve and that works cool also let&#39;s talk about like if i take this checkout session id here and um let&#39;s say the user is like still in the checkout flow and they just like left their page up for you know an hour or a day or whatever and at some point their session was expired but then they try to like continue booking and they&#39;re like okay finally i&#39;m ready to book our family is all we&#39;ve figured out where everyone is gonna stay you click book then you see this expired link thing so you&#39;re not able to actually like pay for it so that is the goal that&#39;s what you want is to to have that expired session prevent them from booking the whole goal here is to avoid double bookings so thanks if we go back to our book listing thing here we have the success url which goes to the reservation url and we have this cancel url which right now is coming back to this cancel listing or the to the listing url for the listing this is if they if they push uh like if they click on this um on this back button this back button you&#39;ll notice that even if you look down in the bottom right there it says localhost listings one right so that&#39;s going to bring them back to the listing url for this specific listing but uh one thing that we could do to improve this is have a cancel url for the reservation so what i think we want to do is say like cancel reservation url that will take in the reservation and we&#39;ll go to our routes and add this reservations oh we already have a cancel one actually let&#39;s do um oh gosh yeah we don&#39;t wanna okay so well maybe let&#39;s call it expire expire yeah because we want it to expire so we&#39;ll make this a get request to expire and we&#39;re going to call expire so then we&#39;ll go to the reservations controller and we&#39;ll make a new method here expire stripe checkout session.expire and we want to pass in params id of the session and then we want to redirect to the listings path sure we&#39;ll just put them pipe them back over to the listings path so what&#39;s going to happen is if someone clicks that back button they&#39;re going to come back this direction um but in the book list yeah so when they come back we also want this to include um this like checkout session id parameter that&#39;s going to be like the um session id so let me show you what i&#39;m talking about okay so if we click on reserve we&#39;re going to reserve some dates in april now so maybe the first to the uh the first to the third click on reserve all right now when we hover over this if you look down in the query spring i&#39;m sorry in the query string ah we have expire but we don&#39;t have the query string param we this needs to be like a question mark situation um so we&#39;ll go back um that is no there is no back because we missed the the like slash here or the the question mark so that should expire just like this and then we end up with okay so kevin in the woods reserve uh we&#39;ll pick another date here in april we&#39;ll say the 10th to the 12th click on reserve that creates a new checkout session redirects and now we have a query string parameter that has the session id so this reservation reservation 44 right if we look at reservation.find 44 this is it right now it&#39;s in the pending state okay and what&#39;s going to happen is when we click on the back button that will bring us to the reservations controller and that&#39;s going to make a get request to this expire action this expire action is going to fire an api call to stripe to expire that session so because we click this back button it&#39;s going to expire the session and say like okay those dates are freed up again so we click on that button we expired the session and now if we go back in here we should see that those dates that we just tried to book are now expired so if someone else wants to book they can do so immediately so we can now try to book 410 to 412 and we don&#39;t actually have to go back through and do anything fancy because we have our we have the api call going and then we&#39;re listening to the web hook that&#39;s coming in for expiration and all of that is just being handled gracefully um so now if we try to go through this again uh what do we get what do we get so those dates again were from um yeah the 10th uh right from the 10th to the 12th so here&#39;s the the booked reservation we go back to cabin in the woods we try to reserve now that it&#39;s booked we won&#39;t be able to go over the top of this and book again by going to um you know april 10th through the 12th and trying to reserve that again sorry that date is already taken so that is that was the goal we wanted to like expire things so we didn&#39;t end up with double bookings if you enjoyed this episode or if you&#39;re enjoying the series i would really appreciate a subscribe uh maybe a thumbs up and otherwise we&#39;ll see you in the next one [Music] you

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