1 00:00:00,450 --> 00:00:06,210 So let's finish up this passage to make a reservation for form, and what we want to do is if someone 2 00:00:06,210 --> 00:00:14,540 tries to go to a reservation summary, I have to type the URL because there's no direct link to it. 3 00:00:15,450 --> 00:00:20,250 We want them to be redirected somewhere else on the site and to be given an error message. 4 00:00:20,250 --> 00:00:25,290 And that just stops things like search engines from trying to index this page, which they'll try to 5 00:00:25,290 --> 00:00:31,410 do, or from someone manually typing in the UFO and getting there and saying, well, there's no information 6 00:00:31,410 --> 00:00:33,240 to show, so why am I even seeing this page? 7 00:00:33,780 --> 00:00:39,450 So right now, because I stopped and restarted my application, which erased the session in our case, 8 00:00:39,690 --> 00:00:43,620 when I tried to go there, I get a blank screen and that's not ideal. 9 00:00:43,620 --> 00:00:45,270 We want something else to happen. 10 00:00:45,870 --> 00:00:52,050 So let's go back to our code and I want to look at our template data go file. 11 00:00:52,050 --> 00:00:56,580 And that's under internal in the folder called Where Is It? 12 00:00:57,090 --> 00:00:58,010 Under Models. 13 00:00:58,020 --> 00:00:59,520 It's called Template Data Dutko. 14 00:00:59,760 --> 00:01:06,090 And you remember a long time ago I put in these things flash warning and error and I said, we'll be 15 00:01:06,090 --> 00:01:08,790 using those later and we're going to use them later right now. 16 00:01:09,570 --> 00:01:15,480 So those actually are in our template data that's passed to every single page of our site, but we're 17 00:01:15,480 --> 00:01:16,220 not using them at all. 18 00:01:16,440 --> 00:01:22,320 So let's go back over to the render ago, which is under the render package in the internal folder. 19 00:01:23,040 --> 00:01:26,850 And let's look at this, this part where we add default data right here. 20 00:01:26,880 --> 00:01:31,050 I am going to populate those three things right in here. 21 00:01:31,200 --> 00:01:35,460 Every time my page is rendered, we're going to populate them and we're not going to manually type things 22 00:01:35,460 --> 00:01:35,700 in. 23 00:01:36,570 --> 00:01:40,530 We're going to take advantage of our session so we can do that as follows. 24 00:01:40,710 --> 00:01:41,870 Tag flash. 25 00:01:42,540 --> 00:01:47,160 And that will be a success message or a message, a messages that appears once and then is automatically 26 00:01:47,160 --> 00:01:49,590 taken out of the session, which is exactly what we want. 27 00:01:50,250 --> 00:01:54,750 We're going to pull this out of the session and we have access to our app variable right here so we 28 00:01:54,750 --> 00:01:57,180 can get our session by going out session. 29 00:01:57,660 --> 00:02:01,020 And no, I'm not going to use, get or put. 30 00:02:01,290 --> 00:02:06,120 I'm going to use pop string, which is again built into our sessions package. 31 00:02:06,390 --> 00:02:07,830 And this is a really useful one. 32 00:02:08,190 --> 00:02:13,680 This will put something in the session until the next time a page is displayed and then it's taken out 33 00:02:13,680 --> 00:02:14,400 automatically. 34 00:02:14,550 --> 00:02:18,570 So it's the perfect place to put messages we want to send to our user. 35 00:02:18,900 --> 00:02:20,550 So I'm going to put that in there pop string. 36 00:02:20,550 --> 00:02:22,350 And it requires a couple of arguments. 37 00:02:22,350 --> 00:02:24,240 The context ARG context. 38 00:02:24,240 --> 00:02:25,620 Well, I don't do I have the context? 39 00:02:26,310 --> 00:02:26,730 There it is. 40 00:02:26,730 --> 00:02:27,960 Yes, I do have the context. 41 00:02:28,320 --> 00:02:33,000 So ARG context and it also requires a name flash. 42 00:02:33,330 --> 00:02:37,830 Since this is a flash variable, that's what I'm going to be calling it. 43 00:02:37,980 --> 00:02:43,830 I'll just call a flash and I'll do the same thing for warning and the same thing for error. 44 00:02:44,250 --> 00:02:50,250 So Teda Error and TDF warning and I'll call error. 45 00:02:50,970 --> 00:02:55,310 Error seems like a good name and I'll call warning warning, which seems like a good name. 46 00:02:55,620 --> 00:02:59,190 So those will automatically be populated any time. 47 00:02:59,610 --> 00:03:07,200 I am rendering a page now back in my handlers, let's change this part that says if not OK. 48 00:03:07,200 --> 00:03:11,880 And remember that this is when we're trying to pull a sessional variable named reservation out of the 49 00:03:11,880 --> 00:03:15,630 session and to type cast it to models reservation. 50 00:03:15,840 --> 00:03:18,420 If that doesn't work, that means one of two things. 51 00:03:18,420 --> 00:03:24,720 Either there's no such and variable data at all or there's no variable called reservation in the session 52 00:03:24,930 --> 00:03:30,860 or the value that's in the session that happens to be name reservation can't be cast to a model reservation, 53 00:03:30,870 --> 00:03:34,140 whatever the case may be, I definitely want to take them somewhere else. 54 00:03:34,470 --> 00:03:40,020 So I'll leave the log file there for now, but I'll now pass a value into our session. 55 00:03:40,020 --> 00:03:43,050 Emden app session put. 56 00:03:44,740 --> 00:03:55,510 And I want to put from context, I will put a value called Okkult error, because this is an error and 57 00:03:55,510 --> 00:03:56,260 I'll give it a value. 58 00:03:56,260 --> 00:04:02,860 And the error I want to put in there is I can't get a reservation from session, which isn't a great 59 00:04:02,860 --> 00:04:05,020 error message, but it's sufficient for our purposes. 60 00:04:05,200 --> 00:04:07,660 So I've now popped that value in there. 61 00:04:08,140 --> 00:04:11,130 And I don't know because it's still just returning an empty page. 62 00:04:11,140 --> 00:04:13,120 So I need to do an HTTP redirect. 63 00:04:13,270 --> 00:04:14,710 Where shall I take the oil issue? 64 00:04:14,710 --> 00:04:23,200 Topdog redirect and I'll just take them to the homepage and I'll give the status http status temporary 65 00:04:23,200 --> 00:04:23,620 redirect. 66 00:04:23,620 --> 00:04:28,600 This time it has to be in the 300 range for a redirect and a temporary redirect is perfect because maybe 67 00:04:28,600 --> 00:04:32,260 they're going to make a reservation, maybe they'll come back here, whatever the case may be, that 68 00:04:32,260 --> 00:04:33,930 is sufficient for our purposes. 69 00:04:34,510 --> 00:04:36,790 So this technically should work now. 70 00:04:36,790 --> 00:04:40,210 We're not going to do anything with that sectional variable yet, but let's just make sure it actually 71 00:04:40,230 --> 00:04:41,170 takes us to the homepage. 72 00:04:41,170 --> 00:04:47,380 So I'll stop the application, start the application that clears everything out and compiles in my changes. 73 00:04:47,650 --> 00:04:52,210 And I'll try just to load this page by doing this and it takes me back. 74 00:04:52,220 --> 00:04:55,950 So it did redirect me to the home page, but it didn't display the error. 75 00:04:56,260 --> 00:04:59,950 So how do I get the error message displayed? 76 00:04:59,950 --> 00:05:00,820 I want to use Nottie. 77 00:05:00,850 --> 00:05:04,740 I want an error message to show up here displaying whatever my error message is. 78 00:05:05,170 --> 00:05:07,300 Well, let's go back to base left. 79 00:05:08,020 --> 00:05:09,190 Let's find that file. 80 00:05:11,190 --> 00:05:15,870 Which is under my code and it's under my templates and it's called base. 81 00:05:16,620 --> 00:05:17,550 So let's find that. 82 00:05:17,910 --> 00:05:23,570 And remember, in this base layout file, we have a bunch of JavaScript that appears on every page. 83 00:05:23,580 --> 00:05:28,110 And this is exactly the situation where I want to handle every possibility. 84 00:05:28,110 --> 00:05:34,800 Every time a user is displayed a page, if there's an error message or a success message or a warning, 85 00:05:34,800 --> 00:05:36,050 I want that to be displayed. 86 00:05:36,060 --> 00:05:38,480 So we'll just worry about success and error for right now. 87 00:05:38,760 --> 00:05:44,610 So let's put those in here and I'll put them right after these two things. 88 00:05:44,640 --> 00:05:48,540 After our notify and notify Motal, I'll create another thing. 89 00:05:48,570 --> 00:05:54,240 Now, what I want to have happen is when someone comes to a page and I need to display an error message, 90 00:05:54,480 --> 00:05:58,710 I want to actually call success. 91 00:05:58,750 --> 00:06:00,030 I want to call it error message. 92 00:06:00,030 --> 00:06:05,870 So I could just do it like this notify, which is right up here. 93 00:06:05,880 --> 00:06:08,850 We've already done this and notify takes two arguments. 94 00:06:08,850 --> 00:06:15,450 It takes a message and a message type and the message will be whatever I get from some value. 95 00:06:15,450 --> 00:06:17,370 So I'll just put a dot there right now as a placeholder. 96 00:06:17,400 --> 00:06:19,130 Actually, that needs to be in quotation marks. 97 00:06:19,680 --> 00:06:24,720 So it's delete this and dot and we'll get that dot populated in a minute. 98 00:06:24,960 --> 00:06:27,620 And the second argument is the message type. 99 00:06:27,630 --> 00:06:29,550 And in this case it happens to be an error. 100 00:06:30,600 --> 00:06:36,260 Now how do I get that dot which in Goldwing template syntax means some kind of data. 101 00:06:36,270 --> 00:06:40,470 I get it like this with and dot here. 102 00:06:42,120 --> 00:06:48,460 And end, which is a shorthand, it says if you have some value in error, that's not empty. 103 00:06:48,840 --> 00:06:49,560 Do this with it. 104 00:06:50,340 --> 00:06:53,040 So it's like an estimate and that will display it if there's an error. 105 00:06:53,460 --> 00:06:55,070 Now, what if I have a success message? 106 00:06:55,080 --> 00:06:56,880 Well, that's stored in a value called flash. 107 00:06:57,150 --> 00:07:00,890 So with Flash and this time it's type success. 108 00:07:02,550 --> 00:07:12,570 So if I start my application and run it again and go back to my Web browser and manually type in the 109 00:07:12,930 --> 00:07:20,070 reservation summary right there and hit it, it partly back and it gave me my error message and that's 110 00:07:20,070 --> 00:07:22,270 exactly what I want to have happen. 111 00:07:23,040 --> 00:07:24,340 So that's really convenient. 112 00:07:24,390 --> 00:07:31,080 Now we could of course, we haven't done that, but if we do one for warning as well, can we do that? 113 00:07:31,110 --> 00:07:31,800 Sure, why not? 114 00:07:31,830 --> 00:07:36,020 We already have a warning so we can copy this, paste it here. 115 00:07:36,030 --> 00:07:36,690 We may as well do it. 116 00:07:36,690 --> 00:07:42,060 Now with Flash becomes with warning, notify, warning. 117 00:07:43,860 --> 00:07:45,060 Let's just make sure that works. 118 00:07:45,330 --> 00:07:46,140 It should compile. 119 00:07:46,140 --> 00:07:48,360 If there's an error, the template won't compile. 120 00:07:49,380 --> 00:07:50,580 So, so far so good. 121 00:07:50,670 --> 00:07:51,590 So let's try it again. 122 00:07:55,380 --> 00:07:56,380 Reservation summary. 123 00:07:57,210 --> 00:07:57,820 And there it is. 124 00:07:57,870 --> 00:07:59,960 OK, so everything compiled, so it works well. 125 00:07:59,970 --> 00:08:05,690 So now I have a means of getting information to my users in the form of an unobtrusive alert. 126 00:08:05,910 --> 00:08:07,470 That's really quite helpful. 127 00:08:07,480 --> 00:08:10,260 And there's one more thing I want to do, and it's a really simple thing. 128 00:08:10,260 --> 00:08:12,620 We've left our reservation in the session. 129 00:08:12,900 --> 00:08:19,290 So when I come back here to my code and look at my handlers, what I'm talking about is this let me 130 00:08:19,290 --> 00:08:20,010 just hide this. 131 00:08:20,820 --> 00:08:29,820 So back in my handlers, when I post wherever that is right here, I posted to my session or I put in 132 00:08:29,820 --> 00:08:34,430 my session then with the name of reservation, the value of this reservation. 133 00:08:34,740 --> 00:08:38,570 Well, once the reservation is complete, that really should be taken out of the session. 134 00:08:38,820 --> 00:08:40,170 So let's go back down here. 135 00:08:40,650 --> 00:08:42,120 We pull it out of the session here. 136 00:08:42,120 --> 00:08:43,250 We check for OK. 137 00:08:43,500 --> 00:08:46,500 And after we get that, we already have the value from the session. 138 00:08:46,500 --> 00:08:47,960 So we don't need it in there anymore. 139 00:08:47,970 --> 00:08:50,820 So let's get rid of it and update session. 140 00:08:51,120 --> 00:08:54,570 And there's got to be a method that says, get it out of here and there it is. 141 00:08:54,570 --> 00:08:55,120 Remove. 142 00:08:55,740 --> 00:09:05,840 So removing using our context, which is right here, and just give the name it has and that is reservation. 143 00:09:06,630 --> 00:09:12,120 So with that, we can actually remove data from our reservation and that is quite helpful. 144 00:09:13,410 --> 00:09:15,390 OK, that's it for this section. 145 00:09:15,390 --> 00:09:19,230 In the next section, we're going to move on to testing because we talked about testing really early 146 00:09:19,230 --> 00:09:22,860 in the course, but we haven't actually written any tests for our code. 147 00:09:22,860 --> 00:09:24,390 That's going to be our final project. 148 00:09:24,660 --> 00:09:27,000 So we'll devote the next few sessions to that.