1

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So now we have to database functions that allow us to check for availability forums.



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We have one that allows us to search for all rooms, and we have one that allows us to search for rooms



3

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by I.D., which is right up here.



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So let's think about what we want to do.



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First of all, let's make sure our application is running.



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And I do that by bringing in my terminal.



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It's not.



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00:00:23,760 --> 00:00:28,620

So let's run it and then we fire up our favorite Web browser, whatever that may be.



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I'll use edged this time.



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I haven't used any edge in a while and I will go to localhost Eighty-eight.



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And here we are, so there are two places where we can check for availability, and the first one is



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at the bottom of this screen, make reservation.



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Now, that takes us to this search screen search for availability.



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And here I choose a start and an end or an arrival and a departure, and that's at the universal search



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dash availability.



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So let's go back to our code and see if we have a route set up for that.



17

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And it looks like we do.



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We have post availability.



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So let's look at that right now.



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All this does is grab the start from the forum post and grab the end from the forum post and store them



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here.



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And those, of course, are string's.



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Anything you grab from a forum post will be in the form of a string and then it just writes it to the



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browser window.



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That's not terribly helpful.



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What I want to do is I want to call the database function that searches for availability for all rooms.



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And if you look at that, that requires start and end in the form of time dot time.



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So I need to take these two variables, start an end and convert them from strings to time dot time.



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Well, we did that once already.



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Let's just look for the word layout, because I know that's part of it.



31

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Yes.



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Right here.



33

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This will actually take two strings.



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I only need these these ones actually, this will take our strings of dates are dates that are in the



35

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form of string and convert them into times.



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OK, so let's go back and find our post availability again, wherever that is post availability.



37

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Here it is.



38

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Now, let's just paste that code in there.



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And I needed to make one change because I'm not calling it SD and I'm calling it start and I'm calling



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it end.



41

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OK, so now I have my two dates in time.



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Time format so I can actually call my function that allows me to search for availability for all rooms.



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Let's see what that returns.



44

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So it takes a start, a time to start in and as time, time.



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And it returns a slice of model's room and potentially an error.



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OK, so let's get that.



47

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We'll call our variable.



48

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We're going to store the slice in Rum's, which makes sense because it's a slice of rooms and er will



49

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be our as usual.



50

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That's going to be equal to m dot db m dot db dot search availability for all rooms and we'll pass at



51

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our start date and our end date and then we'll check for an error.



52

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So let's check for an error.



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If error is not equal to nil then I'll just go helper's dot server error w and the error and we'll return.



54

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Now let's see what's in that room's variable, so I'll just print it out to the screen for right now



55

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to the terminal.



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So I will say for I don't care about the index I is equal to range rooms and I'll just say app dot info



57

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log sorry m dot app dot info log dot print line and we'll say room.



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And I thought I'd I'd try that again, I thought I'd, I thought, remain OK and everything else just



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happened the way that it does.



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So this will see if we're actually getting useful information from our database.



61

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So let's stop this.



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Start this again.



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Go back to this page Reloaded, and before I do this, there's one thing I need to make sure I need



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to be able to search for dates where there is availability and let's make sure what we have in our database



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right now.



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So we go back to our database and look in post Toco and there it is, room restrictions.



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Make sure it's the most recent version.



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It is.



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So there's only one restriction for February the 1st, 2021 to February the 4th, 2021.



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So as long as I search outside of those date ranges, I'll get at least one value.



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If I search in that date range, I will get only one value so I can pretty much choose any dates I want.



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All right.



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So let's choose some dates here and here and see what that gives us is going to print the start and



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end date to the screen.



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Yes.



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And on my terminal where I started it up, it says there are two rooms available that is perfect.



77

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So it looks like when there is availability, the actual rooms variable will have at least one entry.



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When there is no availability, there will be nothing in that slice.



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It'll be an empty slice.



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So I can actually just check the length of the slice.



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If Len and the slices named rooms is equal to zero, then no availability.



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Otherwise there is availability.



83

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So it does handle this case.



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00:05:32,360 --> 00:05:39,710

First, I'm going to go back to my database and I'm going to enter another restriction here for Remedy



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two, because I only have two rooms.



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I'd one in 92 and I'll enter it with exactly the same start and end a 20 21 02 01 to twenty twenty one



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zero two zero four to get them exactly the same room it will be to because I want both rooms to be blocked



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off.



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I'll leave the reservation id empty because there is no reservation to put here so it'll be stored as



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no.



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The restriction idea will be two which is an owner closing and I'll just put any date in here.



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Twenty, twenty, eleven, eighteen, twenty, twenty eleven eighteen.



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And save this.



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All right.



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So now there should be no availability provided I choose dates that are either equal to or inside this



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date range, and that's February the 1st to February the 4th of 2021.



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So let me go back to my browser, go back a screen, reload this to make sure it's current and I will



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choose some availability that's in that date range.



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So I will choose.



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That's odd, shouldn't be doing that autofill there, but I know it doesn't matter, I will choose.



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I need to get rid of that.



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Go there.



103

00:06:53,280 --> 00:06:56,100

I need to choose January February.



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So I'll choose February the 2nd, 2021 to February the 3rd, 2021, and search and see what I get.



105

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So there's my dates and down here in my terminal, if I bring that back up.



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I don't know if that's the last time or this time, let's find out, General, one major general.



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So that's 12, 22.



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I guess I didn't do it.



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OK, so.



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That's exactly right, because there is no available to be printed out, therefore there's no availability.



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Let's make sure I'll just say emerg app dot info log dot print line, no availability.



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So I'm going to start my application just because I want to make sure this is right.



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Started up again.



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Clear the screen.



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Start the application.



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All right, so there's nothing being printed in the terminal right now.



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Let's go back again and go back one screen and just resubmit this form.



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So I want to get rid of that.



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Go back to February the 2nd to February the 3rd.



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OK, search.



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And now I should have the no availability message.



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That's exactly what I wanted.



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So that's working.



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All right.



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Now, what do I want to have happen when I'm on this screen here and I search for availability and there



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is no availability?



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I certainly don't want just to start and end date printed to the browser window.



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That's not helpful at all.



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What I actually want to have happen is I want the user to be taken back to this screen with an error



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message, and we can do that.



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We already know how to do that, in fact, so I can get rid of this because it's just printing to the



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terminal.



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That's not helpful.



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And I don't want to just print that.



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Instead, I want to generate an error message, so I'll store that in the session Emden app session



136

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dot put and it requires the context which I can get from ARG context.



137

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And it requires a key, and when we want an error message to be displayed, we call that error and then



138

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we want the value, just the message that's displayed.



139

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So I'll just put no availability.



140

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So I saw that in the session.



141

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Now I need to redirect them, export redirect and it requires w are you url and Chote.



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So W are the you are always search.



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Available Bill Bill T and my code has to be in the 300 range HDP status, see whether that's in the



144

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300 range.



145

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And then, of course, I want to return.



146

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I want everything else to stop at this point.



147

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So let's see if that works, so I'll stop my application.



148

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Clear the screen, run my application.



149

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It runs go back here, reload the screen to make sure it's current, and I'll choose once again February



150

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the 2nd to February the 3rd.



151

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And hopefully when I click this, it will take me back to the screen with an error message, and it



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does perfect.



153

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But if I choose dates that are available and it doesn't matter what they are, it should just print



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the start date an ending to the screen and it does.



155

00:10:27,050 --> 00:10:28,120

OK, so that works.



156

00:10:28,640 --> 00:10:33,950

So obviously, if there is availability, I don't want to be just displaying the screen.



157

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I want to take them to a page where they say where it says to them, hey, these rooms are available



158

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for your chosen dates.



159

00:10:41,450 --> 00:10:43,760

So to do that, I need to have another page.



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So I'll go copy the contents of the about page and I will open the templates or create a new file in



161

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the templates folder, which I will call Choose Room Page Template.



162

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And I will add that to get and I'll just paste in the about page and see what I want to do here.



163

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What I'm going to do is change the title to choose a room and then I want to range through whatever



164

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rooms are available.



165

00:11:09,410 --> 00:11:17,060

So whatever I got for this variable rooms in my handler, I want to pass that to a template and display



166

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those.



167

00:11:17,480 --> 00:11:20,300

So let's do the template first, then we'll pass the data there.



168

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So I'm going to assume I'm going to use that data a member of my template data.



169

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So if you look at template data, it has this data field, remember, and that can hold whatever we



170

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want to put into that.



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So I'm going to assume that I'm going to get a value, a variable that I'll call rooms and I will pull



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that from the index of data, which is passed to every single template, and we'll have to populate



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it.



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And I'll call it rooms.



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And then I'll just for the sake of of making sure it all works, I'll arrange through rooms and that



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requires an end and I'll just print the room name for now.



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So.



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Room name, and then I'll put a blank line or a line break after that.



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OK, so the template is ready.



180

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Let's go back to our handlers and how are we going to pass that data there?



181

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Well, I know that if this fails, if I have no availability, I'm being taken back so I can just do



182

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it below the if statement.



183

00:12:19,920 --> 00:12:21,440

So let's create a variable called data.



184

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That's going to be a map.



185

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Make a map of string interface.



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Which is what that data format or data variable has to be in template data, and then I'll store my



187

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rooms in their data rooms, plural, because that's what I'm calling it in the template is equal to



188

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rooms.



189

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And now I need to render that template and past data.



190

00:12:41,170 --> 00:12:42,390

I've done that many times.



191

00:12:42,450 --> 00:12:44,440

I'll just find one where we do it right here.



192

00:12:44,980 --> 00:12:50,760

We'll copy this and come back up to my line up here.



193

00:12:50,770 --> 00:12:54,130

Get rid of this because we're not writing to the browser window anymore.



194

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Just text.



195

00:12:55,010 --> 00:13:00,510

Instead, we're going to render the template we just created, which I will call, which I called Choose



196

00:13:00,520 --> 00:13:01,600

Room Page.



197

00:13:02,500 --> 00:13:06,820

Let's make sure we've got this right so we create a data variable.



198

00:13:06,820 --> 00:13:09,280

That's a map of string interface.



199

00:13:09,670 --> 00:13:15,430

We store the rooms in that map and then we passed the data to the template choose room.



200

00:13:15,430 --> 00:13:17,740

And the template is in fact called Choose Room.



201

00:13:17,770 --> 00:13:18,330

This should work.



202

00:13:19,390 --> 00:13:20,590

So start the application.



203

00:13:20,590 --> 00:13:21,640

Start the application.



204

00:13:24,610 --> 00:13:31,180

We go back to our browser, back on screen, search for availability for any two dates that are any



205

00:13:31,180 --> 00:13:33,520

dates, as long as they're not the ones that are blocked.



206

00:13:33,550 --> 00:13:35,230

This should work fine search.



207

00:13:35,800 --> 00:13:37,480

And there it lists the rooms.



208

00:13:37,660 --> 00:13:40,140

OK, we don't want to just list the rooms on this template.



209

00:13:40,510 --> 00:13:46,360

We actually want to make those you URLs so I can pick on pick my room and I might put a picture next



210

00:13:46,360 --> 00:13:47,380

to it or something like that.



211

00:13:47,380 --> 00:13:48,220

But I'm not going to.



212

00:13:48,220 --> 00:13:50,110

It's something you can do on your own if you wish.



213

00:13:50,890 --> 00:13:54,760

What I can do instead is actually just make these links.



214

00:13:54,760 --> 00:13:57,790

So I click on them and then it takes me to the reservation screen.



215

00:13:57,970 --> 00:14:01,390

But what information do I need on that reservation screen?



216

00:14:01,420 --> 00:14:02,280

Well, let's look at it.



217

00:14:02,350 --> 00:14:10,450

I'll open a new tab and go to localhost 1880 Make Dasch reservation.



218

00:14:11,320 --> 00:14:12,550

So this is a form.



219

00:14:12,550 --> 00:14:17,410

And if you recall, we gave it the start date and the end date just as temporary fields.



220

00:14:17,410 --> 00:14:18,510

And that's not helpful.



221

00:14:18,520 --> 00:14:24,640

I need to actually store or have the start date and end date not editable on the screen, because I



222

00:14:24,640 --> 00:14:30,820

don't want the the user to say, oh, I, I want a different date and just arbitrarily change it because



223

00:14:30,820 --> 00:14:31,720

of my reservation.



224

00:14:31,720 --> 00:14:34,630

When I'm making it, I don't check availability at all.



225

00:14:35,620 --> 00:14:38,650

I'm assuming that's done before I ever get to this screen.



226

00:14:39,310 --> 00:14:41,440

So I don't want these to be displayed here.



227

00:14:41,440 --> 00:14:47,230

Maybe I'll put them at the top reservation details arrival and departure and the room they're staying



228

00:14:47,230 --> 00:14:47,390

in.



229

00:14:47,590 --> 00:14:49,890

So this is going to have to change.



230

00:14:50,140 --> 00:14:58,540

More importantly, I need to store that start date and date and remedy somewhere before I actually display



231

00:14:58,540 --> 00:14:59,200

this page.



232

00:14:59,530 --> 00:15:02,400

And we can just do that quite easily by putting it in session.



233

00:15:03,070 --> 00:15:10,440

So let's go back here and let's store some information in the session before we render the template.



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So I want to put the start date and the end date, and I want to put a time dot time in there.



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So can I just store a time dot time in my session?



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Chances are I can't.



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But what I can do if I without actually declaring it, if I go back to my main function, I am in fact



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storing a reservation model type as something I can put in the session.



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So maybe it makes more sense to create an empty reservation variable, populate the start date and end



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date and remedy in that, and store that reservation model in the session.



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Let's do that.



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So back to my handlers.



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I will create a new reservation.



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I'll call it Rez and that's a sign the Value of Models Reservation.



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And I will say Phil Oldfield's, which is built into goaland.



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If not, you're going to if it's not in the one you're using, I have to do it manually.



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I don't care about the ID.



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I don't have one of those yet.



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I don't care about the first name or last name or email at all.



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I do care about these three things.



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Those are the only ones I care about, the start date, the end date and the remedy, and I already



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have all of that information stored somewhere.



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So what I can do here is store the start date and end date and then leave the room it empty and then



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populate that when they click on it.



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But I need to store the start date and end date so I can even get rid of this right now.



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This will be a start date.



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This will be the end date.



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And I'll just stick that reservation right in the session.



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So I will say m dot app dot session dot put our context and I'll call this reservation and I will put



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in the value.



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Now that is stored in the session.



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So I have that available, that information available to me.



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OK, so when I render this page then I know that I've already stored the necessary information in the



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session.



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I have to start that mandate.



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That's all I care about.



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So let's make sure everything compiles.



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Run this.



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Go back to our browser, which was EDG, I believe, yes, it was.



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OK, let's start right from the beginning.



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Search for some dates where I know I'm going to get some availability.



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So the 18th to the 19th search and there they are.



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So at this point, I now have the start date and the end date saved.



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I can use that information if I need to, and I'm going to need to because I may need to make this clickable.



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So what I want to have happen next is when I click on a link here, it pulls my my reservation with



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the start date and end date out of the session and then assigns the idea of the room that I just clicked



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on to that reservation variable, puts it back in the session, updated with the new information and



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then display the make reservation screen.



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All right.



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We'll do that in the next lecture.



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We're getting close to being able to actually book a room now.