1 1 00:00:01,530 --> 00:00:03,610 Welcome back, in this video we're going to start 2 2 00:00:03,610 --> 00:00:08,280 looking at the alerts, an alert in our app is going 3 3 00:00:08,280 --> 00:00:12,080 to be the wrapper around the logic that we need 4 4 00:00:12,080 --> 00:00:15,810 in order to notify users when the item that they're 5 5 00:00:15,810 --> 00:00:19,193 interested in has gone under the price that they desire. 6 6 00:00:20,030 --> 00:00:22,980 So what I've written here is a short programme 7 7 00:00:22,980 --> 00:00:26,310 called alert updater, and what this programme is going to do 8 8 00:00:26,310 --> 00:00:29,670 is in general terms it's going to get all the alerts 9 9 00:00:29,670 --> 00:00:31,800 that there are in a database, 10 10 00:00:31,800 --> 00:00:33,290 then it's going to cycle through them, 11 11 00:00:33,290 --> 00:00:37,166 and for each one it's going to find out the item's price 12 12 00:00:37,166 --> 00:00:39,460 and then it's going to send the user an email. 13 13 00:00:39,460 --> 00:00:42,910 Or some mobile notification, or however we want to do it. 14 14 00:00:42,910 --> 00:00:46,730 It's going to notify the user if the price has been reached. 15 15 00:00:46,730 --> 00:00:48,140 That's basically what it's going to do, 16 16 00:00:48,140 --> 00:00:51,760 of course we don't have an alert model, yet. 17 17 00:00:51,760 --> 00:00:53,930 So we do have to go and write it. 18 18 00:00:53,930 --> 00:00:56,780 But this is how I want to be able to interact 19 19 00:00:56,780 --> 00:00:59,010 with the alert, and again this is what you should 20 20 00:00:59,010 --> 00:01:02,660 be thinking first before going and coding the alert model. 21 21 00:01:02,660 --> 00:01:05,910 Think about what you want it to do. 22 22 00:01:05,910 --> 00:01:09,400 So we're gonna be able to load a specific item's price 23 23 00:01:09,400 --> 00:01:13,694 and that item has to be related to the alert somehow 24 24 00:01:13,694 --> 00:01:18,120 as we are not passing item information anywhere around here, 25 25 00:01:18,120 --> 00:01:21,750 and the alert has to be able to notify the user, 26 26 00:01:21,750 --> 00:01:24,670 whoever that is that the price has been reached 27 27 00:01:24,670 --> 00:01:25,943 if it has been reached. 28 28 00:01:26,890 --> 00:01:29,640 Let's go into our models and create a new file 29 29 00:01:29,640 --> 00:01:33,470 that I'm going to call alert, and here we're going to write 30 30 00:01:33,470 --> 00:01:38,470 our alert class, now we're gonna have an init method, 31 31 00:01:39,030 --> 00:01:40,730 we're gonna have a JSON method. 32 32 00:01:40,730 --> 00:01:41,870 We're gonna need this in order 33 33 00:01:41,870 --> 00:01:43,984 to write things to the database, 34 34 00:01:43,984 --> 00:01:48,200 we're gonna have a save to mongo method. 35 35 00:01:48,200 --> 00:01:50,900 Because we do need to be able to save this alert 36 36 00:01:50,900 --> 00:01:54,420 to the database, we're gonna have a class method 37 37 00:01:54,420 --> 00:01:57,620 called all and that's gonna be able to load all 38 38 00:01:57,620 --> 00:02:02,620 of the alerts and then we're going to have a load item price 39 39 00:02:06,810 --> 00:02:08,717 and we're also going to have 40 40 00:02:08,717 --> 00:02:11,633 a notify if price reached method. 41 41 00:02:14,550 --> 00:02:17,060 Now it's up to you whether you want to order these. 42 42 00:02:17,060 --> 00:02:19,660 Normally I recommend putting the class methods 43 43 00:02:19,660 --> 00:02:24,500 at the end just to keep methods of the same type 44 44 00:02:24,500 --> 00:02:27,020 all together and so I think this is gonna look 45 45 00:02:27,020 --> 00:02:30,140 a little bit nicer, and so the next thing to do 46 46 00:02:30,140 --> 00:02:32,250 is to annotate these methods, 47 47 00:02:32,250 --> 00:02:35,310 and define what parameters they're gonna take. 48 48 00:02:35,310 --> 00:02:37,300 That's just gonna help you stay on track 49 49 00:02:37,300 --> 00:02:38,880 with what you want. 50 50 00:02:38,880 --> 00:02:41,360 The JSON method for example is going to return 51 51 00:02:41,360 --> 00:02:45,570 a dictionary because that's what we're gonna use 52 52 00:02:45,570 --> 00:02:49,130 to write things to MongoDB so from typing we're going 53 53 00:02:49,130 --> 00:02:54,130 to import dict, save to Mongo is not gonna return anything 54 54 00:02:54,880 --> 00:02:56,470 and it's not gonna take any arguments. 55 55 00:02:56,470 --> 00:03:00,070 Load item price neither, notify if price reached 56 56 00:03:00,070 --> 00:03:02,563 is not going to do anything. 57 57 00:03:04,090 --> 00:03:08,290 So then we've got this all which is going to be a list, 58 58 00:03:08,290 --> 00:03:10,320 now okay so we do have to import that as well. 59 59 00:03:10,320 --> 00:03:12,700 Actually now that we're here, we might as well do this too 60 60 00:03:12,700 --> 00:03:16,843 for the items so this all method here is going 61 61 00:03:16,843 --> 00:03:17,933 to return a list as well. 62 62 00:03:19,200 --> 00:03:20,033 There we go. 63 63 00:03:21,990 --> 00:03:25,780 Alright so we have the definition of what our methods 64 64 00:03:25,780 --> 00:03:28,550 are going to be like, next step is to start defining 65 65 00:03:28,550 --> 00:03:33,550 the dunder init, an alert has to know a little bit 66 66 00:03:34,380 --> 00:03:39,380 about the item that it is about, so this alert is placed 67 67 00:03:40,060 --> 00:03:44,060 on a specific item so for that we're going to be receiving 68 68 00:03:44,060 --> 00:03:47,110 an item ID which is going to be a string. 69 69 00:03:47,110 --> 00:03:52,080 The item ID is going to be this dunder, sorry not dunder, 70 70 00:03:52,080 --> 00:03:56,430 this underscore ID property of the item. 71 71 00:03:56,430 --> 00:03:59,090 With this underscore ID property we're going to be able 72 72 00:03:59,090 --> 00:04:01,670 to find the item object in the database 73 73 00:04:01,670 --> 00:04:03,623 and actually create an object from it. 74 74 00:04:04,590 --> 00:04:08,350 So we're gonna take in the item ID, then we're also going 75 75 00:04:08,350 --> 00:04:11,860 to have a price limit and that's going to be a float. 76 76 00:04:11,860 --> 00:04:15,810 And what this is going to mean is under which price 77 77 00:04:15,810 --> 00:04:19,180 do we want to send the user a notification 78 78 00:04:19,180 --> 00:04:22,803 that the item has gone under their price that they wanted? 79 79 00:04:24,070 --> 00:04:25,540 And finally we're also going to have 80 80 00:04:25,540 --> 00:04:28,040 an underscore ID property which is going to be a string 81 81 00:04:28,040 --> 00:04:29,740 and it's going to default to none. 82 82 00:04:30,870 --> 00:04:32,610 Alright so now that we have this, 83 83 00:04:32,610 --> 00:04:37,610 we're going to say self.item ID is going to be item id. 84 84 00:04:38,274 --> 00:04:41,723 And the self.item is going to be item get by id. 85 85 00:04:43,000 --> 00:04:47,840 So we're going to actually go and get an item by its ID. 86 86 00:04:47,840 --> 00:04:50,510 Using the item ID we're going to go into the database, 87 87 00:04:50,510 --> 00:04:53,340 we're going to retrieve a specific item 88 88 00:04:53,340 --> 00:04:56,450 and this is going to give us an item object. 89 89 00:04:56,450 --> 00:04:58,080 Not a dictionary, 90 90 00:04:58,080 --> 00:05:01,423 so this is of course something that we do need to create. 91 91 00:05:04,740 --> 00:05:07,370 Okay so this doesn't exist yet, but that's fine 92 92 00:05:07,370 --> 00:05:09,957 we're defining how we want to interact with it 93 93 00:05:09,957 --> 00:05:12,563 and we can go on and create that method in a moment. 94 94 00:05:13,800 --> 00:05:17,370 Then the price limit is gonna be price limit 95 95 00:05:18,570 --> 00:05:23,570 and the collection is going to be alerts 96 96 00:05:23,860 --> 00:05:28,223 and finally the ID is going to be ID or uuid.uuid4 hex 97 97 00:05:30,300 --> 00:05:32,343 and we do have to import that as well. 98 98 00:05:36,180 --> 00:05:41,180 Alright so now we have the dunder init defined, 99 99 00:05:41,320 --> 00:05:44,480 we just have to go and create this get by ID 100 100 00:05:44,480 --> 00:05:46,360 which is going to be fairly straightforward, 101 101 00:05:46,360 --> 00:05:49,070 it's going to be fairly similar to this all method here 102 102 00:05:49,070 --> 00:05:53,030 and by the way, now that we're here I'm going to move this 103 103 00:05:53,030 --> 00:05:55,430 down there as well just to keep the consistency. 104 104 00:05:57,500 --> 00:06:01,610 There we go, so this is the find by ID method definition 105 105 00:06:01,610 --> 00:06:06,390 all that it has to do is go and find the item JSON 106 106 00:06:06,390 --> 00:06:10,830 in the database, database.find one in the items collection 107 107 00:06:10,830 --> 00:06:14,683 and the query is going to be ID is ID, 108 108 00:06:18,040 --> 00:06:23,040 and then return a CLS of that, it returns an item object 109 109 00:06:23,100 --> 00:06:27,920 made with the contents of the thing that was found 110 110 00:06:27,920 --> 00:06:30,870 in a database, notice how in the database we have this 111 111 00:06:30,870 --> 00:06:33,610 find one method, this doesn't exist yet. 112 112 00:06:33,610 --> 00:06:36,377 But all it's gonna do is go into the database 113 113 00:06:36,377 --> 00:06:40,860 and just retrieve the first item that matches 114 114 00:06:40,860 --> 00:06:44,730 this query, because the underscore ID property 115 115 00:06:44,730 --> 00:06:48,150 is unique in MongoDB then we know that there's ever 116 116 00:06:48,150 --> 00:06:50,980 only going to be one item that matches this property. 117 117 00:06:50,980 --> 00:06:53,700 So we can just retrieve that one, 118 118 00:06:53,700 --> 00:06:55,250 and the difference between find 119 119 00:06:56,167 --> 00:06:58,800 and find one is that find returns a cursor. 120 120 00:06:58,800 --> 00:07:01,560 Something that you can iterate over and use a for loop. 121 121 00:07:01,560 --> 00:07:04,660 Find one is just going to return a dictionary, 122 122 00:07:04,660 --> 00:07:06,940 so we can then turn that dictionary 123 123 00:07:06,940 --> 00:07:10,083 into an item object very easily. 124 124 00:07:11,770 --> 00:07:14,370 Okay, so we can go into the database.py 125 125 00:07:14,370 --> 00:07:18,710 and define the find one, again almost the same 126 126 00:07:18,710 --> 00:07:21,380 as the rest of the things we have here. 127 127 00:07:21,380 --> 00:07:23,590 Only it returns a dictionary so we're going to say 128 128 00:07:23,590 --> 00:07:28,590 return database database, collection, find one, query 129 129 00:07:30,730 --> 00:07:35,730 and the insert and find one methods are defined 130 130 00:07:36,350 --> 00:07:41,090 in PyMongo so it is the collection object 131 131 00:07:41,090 --> 00:07:44,550 in PyMongo that has these properties that we're calling, 132 132 00:07:44,550 --> 00:07:47,040 so really we're just calling the same thing that 133 133 00:07:47,040 --> 00:07:50,140 we are receiving here the insert method 134 134 00:07:50,140 --> 00:07:53,720 in our database class calls the insert method in PyMongo. 135 135 00:07:53,720 --> 00:07:55,320 The find method in our database class 136 136 00:07:55,320 --> 00:07:57,230 calls the find method in PyMongo, 137 137 00:07:57,230 --> 00:07:59,910 it's just for our convenience so that we don't have 138 138 00:07:59,910 --> 00:08:01,740 to keep track of this database object 139 139 00:08:01,740 --> 00:08:02,900 all around our programme. 140 140 00:08:02,900 --> 00:08:04,870 We can just call our database class, 141 141 00:08:04,870 --> 00:08:07,758 it just makes things a little bit simpler, 142 142 00:08:07,758 --> 00:08:10,290 and that's what that find by ID is going to do, 143 143 00:08:10,290 --> 00:08:13,330 just find that single item, return the JSON 144 144 00:08:13,330 --> 00:08:15,203 and turn it into a class. 145 145 00:08:16,573 --> 00:08:21,573 Okay, so now that we have that we are, oh sorry. 146 146 00:08:21,770 --> 00:08:24,890 Find by ID should be called get by ID my apologies, 147 147 00:08:24,890 --> 00:08:26,500 just to match that name here. 148 148 00:08:26,500 --> 00:08:29,020 We have the get by ID property there. 149 149 00:08:29,020 --> 00:08:32,093 Now we can begin work on the JSON method of the alert, 150 150 00:08:33,060 --> 00:08:34,970 and this is going to return all of the things 151 151 00:08:34,970 --> 00:08:38,963 that we would like to save to MongoDB for an alert. 152 152 00:08:38,963 --> 00:08:41,403 It's going to be the underscore ID, 153 153 00:08:42,750 --> 00:08:46,090 it's going to be the price limit that we do need to save 154 154 00:08:46,990 --> 00:08:48,823 and it's going to be the item ID. 155 155 00:08:50,390 --> 00:08:52,620 We don't need anything else because in order to create 156 156 00:08:52,620 --> 00:08:55,460 a new alert we just need these three properties. 157 157 00:08:55,460 --> 00:08:58,170 With the item ID we then go and search for an item, 158 158 00:08:58,170 --> 00:09:01,680 the price limit and the ID, collection is hard coded 159 159 00:09:01,680 --> 00:09:03,460 so we don't need to save it to the database, 160 160 00:09:03,460 --> 00:09:05,360 because it's always gonna be the same. 161 161 00:09:06,530 --> 00:09:09,450 To save to Mongo very straightforward, 162 162 00:09:09,450 --> 00:09:13,200 just the same as the item database insert self.collection 163 163 00:09:13,200 --> 00:09:17,560 and self.JSON, do make sure to call the JSON method there 164 164 00:09:17,560 --> 00:09:21,630 don't do this as that will try to save the JSON method 165 165 00:09:21,630 --> 00:09:24,410 to the database, not the output of the JSON method. 166 166 00:09:24,410 --> 00:09:27,700 It's a popular typo there, 167 167 00:09:27,700 --> 00:09:31,863 and we do have to import the database of course. 168 168 00:09:32,900 --> 00:09:34,470 I hope I'm not going too quickly. 169 169 00:09:34,470 --> 00:09:36,830 But this is basically the same that we did 170 170 00:09:36,830 --> 00:09:39,770 in the item model but for the alert, 171 171 00:09:39,770 --> 00:09:41,420 so just the define the properties. 172 172 00:09:41,420 --> 00:09:43,850 Define the representation that we want to save 173 173 00:09:43,850 --> 00:09:46,260 and then define the save to mongo. 174 174 00:09:46,260 --> 00:09:47,840 Now we're going to slow down a little bit 175 175 00:09:47,840 --> 00:09:50,370 as we work on the load item price. 176 176 00:09:50,370 --> 00:09:51,975 What does this have to do? 177 177 00:09:51,975 --> 00:09:56,930 Well it has to go to the item object that we have defined, 178 178 00:09:56,930 --> 00:10:01,930 self.item and make it load the price. 179 179 00:10:02,740 --> 00:10:05,098 So make it actually go to the website 180 180 00:10:05,098 --> 00:10:08,090 and load the price that it has stored 181 181 00:10:09,530 --> 00:10:12,570 and then it just has to return that 182 182 00:10:12,570 --> 00:10:14,930 or let us use that somehow. 183 183 00:10:14,930 --> 00:10:18,330 So we're going to say self.item.load price 184 184 00:10:18,330 --> 00:10:21,520 this is one of the benefits, one of the main benefits 185 185 00:10:21,520 --> 00:10:26,040 of having object in your properties there. 186 186 00:10:26,040 --> 00:10:28,310 Having this item object just lets you call 187 187 00:10:28,310 --> 00:10:30,730 the method you don't have to do any magic 188 188 00:10:30,730 --> 00:10:33,830 or rewrite the code or anything like that. 189 189 00:10:33,830 --> 00:10:37,010 All of that logic related to getting the price 190 190 00:10:37,010 --> 00:10:39,910 is encapsulated in the item model 191 191 00:10:39,910 --> 00:10:43,490 and the alert doesn't really have to know anything about it. 192 192 00:10:43,490 --> 00:10:46,917 Now I'm gonna make this actually return the price, 193 193 00:10:46,917 --> 00:10:50,970 just to make things a little bit simpler, 194 194 00:10:50,970 --> 00:10:54,100 for the caller whoever wants to interact with this method 195 195 00:10:54,100 --> 00:10:57,550 they can either load it and then access the item 196 196 00:10:57,550 --> 00:11:00,280 or they can load it and then they just get the price back. 197 197 00:11:00,280 --> 00:11:02,800 Either will work and this can make things 198 198 00:11:02,800 --> 00:11:04,250 a little bit easier for them, 199 199 00:11:05,550 --> 00:11:08,180 and finally we're gonna work on the notify if price reached. 200 200 00:11:08,180 --> 00:11:11,450 So for now we're not going to be sending emails. 201 201 00:11:11,450 --> 00:11:13,750 Later on in the course we will be sending emails 202 202 00:11:13,750 --> 00:11:18,083 so it will definitely be something we will be working on. 203 203 00:11:19,010 --> 00:11:21,230 Later on the course we will be sending emails 204 204 00:11:21,230 --> 00:11:24,010 so we will learn about that in due course, 205 205 00:11:24,010 --> 00:11:27,175 but for now all I was going to do is if the item price 206 206 00:11:27,175 --> 00:11:31,672 is less than the price limit then it's going to print 207 207 00:11:31,672 --> 00:11:36,672 that the item has reached the appropriate price. 208 208 00:11:47,520 --> 00:11:49,710 So as you can see using an F string makes things 209 209 00:11:49,710 --> 00:11:53,230 quite straight forward, you can just embed things 210 210 00:11:53,230 --> 00:11:56,210 directly into the string and they will be replaced 211 211 00:11:56,210 --> 00:12:00,163 by the value of the variable, when this evaluates. 212 212 00:12:01,320 --> 00:12:04,990 For the all method, same thing as the item. 213 213 00:12:04,990 --> 00:12:08,083 So we're gonna take this here, 214 214 00:12:09,780 --> 00:12:12,040 and we're just gonna do the exact same but instead 215 215 00:12:12,040 --> 00:12:15,200 of items from DB it's gonna be alerts from DB 216 216 00:12:15,200 --> 00:12:18,400 and instead of item it's gonna be cls, 217 217 00:12:18,400 --> 00:12:20,603 and instead of this it's gonna be that. 218 218 00:12:24,490 --> 00:12:28,250 So exactly the same which does remind me that I forgot 219 219 00:12:28,250 --> 00:12:31,630 to use cls there, same thing item or cls 220 220 00:12:31,630 --> 00:12:33,970 but of course now in the alert class, 221 221 00:12:33,970 --> 00:12:38,060 cls means the alert class not item. 222 222 00:12:38,060 --> 00:12:40,600 Because the cls means the current class 223 223 00:12:40,600 --> 00:12:44,630 that is being called when you call this method. 224 224 00:12:44,630 --> 00:12:47,630 So exactly the same code, just changing over the names 225 225 00:12:47,630 --> 00:12:49,920 and the collection that we're finding things in, 226 226 00:12:49,920 --> 00:12:54,213 gonna give us a set of alert objects. 227 227 00:12:56,070 --> 00:12:59,913 Okay, so we have everything we need. 228 228 00:13:02,020 --> 00:13:06,800 We okay, so we have everything we need, 229 229 00:13:06,800 --> 00:13:09,740 we can go back to our alert updater 230 230 00:13:09,740 --> 00:13:12,040 and we can run it and see what happens. 231 231 00:13:12,040 --> 00:13:12,890 Let's press play. 232 232 00:13:14,140 --> 00:13:16,120 This is a very common issue that I just did 233 233 00:13:16,120 --> 00:13:20,630 a lot of machines do this, notice that nothing happened, 234 234 00:13:20,630 --> 00:13:23,660 and that's because I am running app.py 235 235 00:13:23,660 --> 00:13:27,160 and this is alert updater.py do make sure that 236 236 00:13:27,160 --> 00:13:28,680 when you're running a different file 237 237 00:13:28,680 --> 00:13:31,230 or if something happens that you didn't expect. 238 238 00:13:31,230 --> 00:13:32,980 Make sure you're running the correct file, 239 239 00:13:32,980 --> 00:13:35,623 so right click alert updater and press Run. 240 240 00:13:37,400 --> 00:13:40,500 Okay so it says no alerts have been created, 241 241 00:13:40,500 --> 00:13:42,350 that's because I've got an if statement down here 242 242 00:13:42,350 --> 00:13:44,260 that says if there are no alerts, 243 243 00:13:44,260 --> 00:13:45,840 print that there are no alerts 244 244 00:13:45,840 --> 00:13:47,840 and they are not wrong, we have not added any alerts 245 245 00:13:47,840 --> 00:13:50,310 so we're gonna do that first. 246 246 00:13:50,310 --> 00:13:52,980 The way we're gonna do that is we're just gonna say from, 247 247 00:13:52,980 --> 00:13:56,880 models.alert import alert and then we're gonna say 248 248 00:13:56,880 --> 00:14:00,650 alert equals alert and we do have to pass in 249 249 00:14:01,548 --> 00:14:04,220 an item ID and a price limit. 250 250 00:14:04,220 --> 00:14:09,040 So the item ID we can find it in MongoDB, 251 251 00:14:09,040 --> 00:14:14,040 for example this one, and the price limit is gonna be 1,000 252 252 00:14:16,100 --> 00:14:20,773 or maybe 2,000 just so actually we get something. 253 253 00:14:21,840 --> 00:14:26,840 Save that to MongoDB, run app.py in order to save that, 254 254 00:14:28,650 --> 00:14:31,000 and now we can go back to running alert updater 255 255 00:14:31,870 --> 00:14:34,570 and you can see that we get back our string. 256 256 00:14:34,570 --> 00:14:38,660 The item this one, has reached the price under 2,000. 257 257 00:14:38,660 --> 00:14:43,660 Latest price is 1,469.0 this may not be the best 258 258 00:14:44,030 --> 00:14:45,630 string in the world, you can play around with it, 259 259 00:14:45,630 --> 00:14:47,340 you can change it however you like. 260 260 00:14:47,340 --> 00:14:50,980 But as you can see, we do get the information 261 261 00:14:50,980 --> 00:14:53,710 that we were after, which is that we know when 262 262 00:14:53,710 --> 00:14:57,220 we run this alert updater that the item has 263 263 00:14:57,220 --> 00:14:59,130 reached the price we wanted. 264 264 00:14:59,130 --> 00:15:01,660 So you can see how this would be useful for you 265 265 00:15:01,660 --> 00:15:03,810 as an individual like the developer. 266 266 00:15:03,810 --> 00:15:05,700 Because there is no way of communicating 267 267 00:15:05,700 --> 00:15:08,660 to any other users for now, you actually have to run 268 268 00:15:08,660 --> 00:15:11,910 the programme and look at the console to get an output 269 269 00:15:11,910 --> 00:15:15,550 but even that, is already kinda useful. 270 270 00:15:15,550 --> 00:15:17,960 When we start sending emails, 271 271 00:15:17,960 --> 00:15:20,900 and when we allow our users to go into the website 272 272 00:15:20,900 --> 00:15:23,820 and add their own items and their own alerts 273 273 00:15:23,820 --> 00:15:26,320 that's going to be pretty amazing. 274 274 00:15:26,320 --> 00:15:28,558 It's going to let them keep track of their items 275 275 00:15:28,558 --> 00:15:30,883 whenever and wherever. 276 276 00:15:32,520 --> 00:15:35,980 In addition whenever we run this alert updater, 277 277 00:15:35,980 --> 00:15:38,340 they will be able to get our notification 278 278 00:15:38,340 --> 00:15:40,610 and depending on how often we do that. 279 279 00:15:40,610 --> 00:15:43,720 Then this will be more accurate or less, 280 280 00:15:43,720 --> 00:15:45,940 and what I mean by that is if we run the alert updater 281 281 00:15:45,940 --> 00:15:49,170 ever minute then they will find out about 282 282 00:15:49,170 --> 00:15:54,050 the price change pretty rapidly after the price has changed. 283 283 00:15:54,050 --> 00:15:58,233 If we run it every day they might miss some flash sales. 284 284 00:15:59,120 --> 00:16:01,570 However if we run it every minute they may get 285 285 00:16:01,570 --> 00:16:04,510 an email every minute, that may not be what we want. 286 286 00:16:04,510 --> 00:16:08,070 So these is gonna be a bit of compromise there 287 287 00:16:08,070 --> 00:16:10,930 that we'll have to make in order to have 288 288 00:16:10,930 --> 00:16:12,963 the right frequency for alerts. 289 289 00:16:13,990 --> 00:16:17,420 Of course, you can do a lot of intelligent stuff 290 290 00:16:17,420 --> 00:16:19,650 with something like this in order to not 291 291 00:16:19,650 --> 00:16:21,780 notify users that have already been notified, 292 292 00:16:21,780 --> 00:16:25,560 and so on and so forth but we're not gonna get into that 293 293 00:16:25,560 --> 00:16:27,423 much complexity in this app. 294 294 00:16:28,570 --> 00:16:30,640 Anyway, I'm rambling on so thanks for joining me, 295 295 00:16:30,640 --> 00:16:33,760 I hope you're excited for the next steps in this app 296 296 00:16:33,760 --> 00:16:35,510 and I'll see you in the next video.