WEBVTT 00:05.170 --> 00:06.760 Probably everyone will come back. 00:07.060 --> 00:14.800 So in this video we're going to be finishing the four last resources in the API for the bank and we're 00:14.800 --> 00:18.030 going to be wrapping up the whole API basically. 00:18.040 --> 00:18.390 OK. 00:18.400 --> 00:19.800 So let's get started. 00:20.140 --> 00:25.090 So the next class that we're going to be riding's Let's go back to your robot I'm writing the next class 00:25.090 --> 00:27.720 which is the transfer transfer ability. 00:27.720 --> 00:28.140 OK. 00:28.300 --> 00:31.250 So we're going to have a class called transfer. 00:31.460 --> 00:34.120 Then we're going to inherit from resource. 00:34.870 --> 00:35.870 OK. 00:36.880 --> 00:39.580 And then we're going to do define boast self. 00:39.640 --> 00:44.000 So we're going to only support posts because all of them support posts here. 00:44.030 --> 00:48.730 So you can post post post post post and post it. 00:49.020 --> 00:50.350 All of them support post. 00:50.470 --> 00:57.460 Someone I knew posted data is equal to your request so we get to the crux of the first step was always 00:57.460 --> 00:58.940 to get the posts the data. 00:59.140 --> 01:01.990 Then for this one I have a couple of things right. 01:01.990 --> 01:04.740 I have the username the password that. 01:04.770 --> 01:05.490 And the money. 01:05.530 --> 01:07.120 OK so is your memory here. 01:07.270 --> 01:10.720 I have the username password too and the amount. 01:10.950 --> 01:19.680 OK so when a new user name is equal to posted data the user name the and want to get the username password 01:19.690 --> 01:22.770 as usual. 01:24.220 --> 01:30.670 And then there's a certain thing I want to get to Gaisford do is equal to posted data and then I want 01:30.670 --> 01:39.670 to get to just let's just leave the field to them the money is going to be posted data and then amount. 01:39.700 --> 01:43.810 OK so how much amount or how much money do you want to transfer from what I got to you. 01:44.010 --> 01:46.450 OK now a couple things. 01:46.450 --> 01:49.820 First of all we need to verify as usual the credentials. 01:49.840 --> 01:56.990 OK so I want to say return on error is equal to verify credentials. 01:57.070 --> 02:05.350 With this username and password then I'm going to say if there is any errors in the code in that this 02:05.350 --> 02:12.370 function finds out that I'm going to return the size I The Returned is OK. 02:12.700 --> 02:17.270 All right so now I've checked the credentials of the user. 02:17.290 --> 02:21.340 Now I need to check that the catch of the user is enough to transfer right. 02:21.460 --> 02:28.630 So what to say cash is equal to cash with user usernames I must see how much money does he have. 02:28.770 --> 02:36.100 Then I say if cash is less than or equal to zero then in that case I'm going to be returning an error 02:36.100 --> 02:43.300 message which is going to be used on inside and then generate return dictionary. 02:43.390 --> 02:49.120 This is going to be a three or four if you remember three or four is not enough. 02:49.350 --> 02:53.990 So you're out of money so he usually needs to add more money than you're going to do. 02:54.040 --> 02:56.280 You're out of money. 02:56.590 --> 02:59.270 Please add or take a loan. 02:59.650 --> 03:03.260 OK and that's it. 03:03.310 --> 03:06.400 OK so that's if the money is less than or equal to zero. 03:06.400 --> 03:09.000 Now what about if the user does not exist right. 03:09.010 --> 03:11.320 So which user do you mean here. 03:11.410 --> 03:12.800 I mean they use it too. 03:12.860 --> 03:20.710 So let's say you're trying to say two to no sense mind to Santa Claus or Santa Claus doesn't exist right. 03:20.780 --> 03:21.230 Hopeful. 03:21.240 --> 03:23.180 Well if you're a kid and he does exist. 03:23.200 --> 03:30.620 But anyways so if this account doesn't exist in the bank then I can't just transfer it to that account. 03:30.760 --> 03:34.270 So I'm going to do if not use or exists. 03:34.270 --> 03:44.550 So if this user was the name two doesn't exist then in that case I'm going to return the sun if I generate 03:44.560 --> 03:50.950 return dictionary that I'm going to pass to the user a serial one because this user doesn't exist so 03:50.950 --> 03:52.560 it's an invalid username. 03:52.620 --> 03:56.690 Now I'm going to pass the message receiver. 03:56.740 --> 03:58.880 User name is invalid. 03:58.960 --> 03:59.830 OK. 04:00.060 --> 04:01.310 And we're done. 04:01.840 --> 04:02.980 Ok cool. 04:03.100 --> 04:05.930 So other than that what do we need to do. 04:06.010 --> 04:12.660 Well I think to first see how much money does the user how how much money does the recipient have said 04:12.660 --> 04:19.490 the receiver how and also how much money is in the bank because I'm going to take $1 from the trans 04:19.590 --> 04:28.750 as a transaction fee some say cash from is equal to cash with a user username then I'm also going to 04:28.750 --> 04:34.300 see cash to is equal to cash with the user too. 04:34.330 --> 04:38.310 So this is the cash from is the money with me the cash. 04:38.310 --> 04:39.090 Who has the money. 04:39.100 --> 04:40.680 The person I'm sending do. 04:40.900 --> 04:47.750 And the bank cash is equal to cash with user. 04:48.190 --> 04:49.770 His name is bank. 04:50.190 --> 04:52.260 Man in all capitals. 04:52.630 --> 04:56.550 Now going to update the account update account. 04:56.690 --> 05:05.150 Bank and some guy at a desk bank underscore cash plus want someone to add $1 into the bank count as 05:05.150 --> 05:07.250 a transaction fee. 05:07.250 --> 05:09.600 I'm also going to add. 05:10.580 --> 05:16.820 So I'm going to also update the account of the person to reset the money. 05:16.820 --> 05:20.530 And I'm going to send in cash too. 05:20.570 --> 05:28.040 So the money that he already had plus the amount of case plus the money that was sent to him minus one 05:28.130 --> 05:31.830 which is the transaction fee that I that the bank got. 05:31.850 --> 05:33.380 Correct. 05:33.380 --> 05:38.050 And then finally I want to update the account of the person who sent. 05:38.060 --> 05:44.260 So it's the journey that I'm going to basically subtract the money from him. 05:44.270 --> 05:45.020 OK. 05:46.110 --> 05:53.290 So I'm going to do cash no score from minus money and that's it. 05:53.340 --> 05:54.390 OK. 05:54.900 --> 05:56.710 Now of course you can argue that. 05:56.750 --> 06:01.020 Or how do I know that he has enough money that we can add also this next yearbook. 06:01.110 --> 06:05.300 Feel free to if you don't want to do that then that's fine too. 06:05.300 --> 06:06.030 All right. 06:06.210 --> 06:12.720 So now once we're taken taking away the money from the amount that he had then the only thing left is 06:12.720 --> 06:16.280 to journey to success is a success message. 06:16.290 --> 06:16.980 OK. 06:17.220 --> 06:30.660 So I'm going to return Sunnyside and then Gennari to return dictionary as do hundred pounds amount transferred 06:32.220 --> 06:33.160 successfully. 06:33.210 --> 06:35.130 OK great. 06:35.430 --> 06:39.850 And that's it for the for the transfer function. 06:39.850 --> 06:42.630 So that's the transfer function over here. 06:42.690 --> 06:46.980 So it's transferred some money from one account to the other account every day. 06:47.050 --> 06:47.950 OK. 06:48.450 --> 06:51.800 Now the next one is to you and we tried the balance function right. 06:51.810 --> 06:55.070 How much balance are these are Hatsune this one is over. 06:55.410 --> 07:03.580 So how much balance are they use or have someone write class balance that inherits from resource then 07:03.690 --> 07:10.590 I'm going to support the post because all of them are post and then the first step is as usual get the 07:10.590 --> 07:15.560 posted data and we get it from request dobbed get their score. 07:15.600 --> 07:23.520 Jason OK once they have that then I want the username and the password so my user name is equal to posted 07:23.520 --> 07:32.710 data username and password is you to post a data password. 07:33.090 --> 07:34.210 All right. 07:34.260 --> 07:39.160 Now the next thing is I need to check for credentials again sir returned Jason. 07:39.330 --> 07:44.150 Error is difficult to verify credentials. 07:44.220 --> 07:51.040 This username and password none of my check if there then return. 07:51.380 --> 07:55.100 If I the return Jason. 07:55.170 --> 07:55.660 OK. 07:55.710 --> 07:58.940 So that's the one that has years. 07:59.630 --> 08:00.710 All right. 08:00.800 --> 08:04.850 Now a return Jason is equal to users. 08:04.890 --> 08:07.310 Signed. 08:07.420 --> 08:12.400 Going to find the user name the user with this user name. 08:13.050 --> 08:15.400 And then you get access. 08:15.600 --> 08:17.740 Well I'm going to basically. 08:17.820 --> 08:19.460 So I'm trying to find a user. 08:19.460 --> 08:19.980 OK. 08:20.160 --> 08:27.390 But this user I want to get their response that I want to get is they want to get only his user name 08:27.860 --> 08:34.110 his 0 0 1 or 0 1 and his debt. 08:34.110 --> 08:34.680 OK. 08:34.710 --> 08:39.980 So I don't want to see the I.D. and I don't want to see the password of this user return. 08:40.110 --> 08:46.080 So we're glad to hear the projection if you remember from the Mongo D-B slides we talked about projection 08:46.290 --> 08:53.670 which is to hide some of the some of the fields from showing up so I'm going to do a comma here so I'll 08:53.670 --> 08:57.610 come here and then I'm to do another. 08:57.840 --> 08:59.160 Ansal here. 08:59.420 --> 09:00.630 No mercy password. 09:00.650 --> 09:02.810 I don't want to see that password return. 09:02.910 --> 09:04.780 So I'm going to do zero. 09:05.100 --> 09:05.860 OK. 09:06.030 --> 09:12.760 Then I also don't want to see the underscore ID automatic feel underscore ID and then also put zero 09:12.820 --> 09:13.470 aside. 09:13.620 --> 09:23.130 So that means it seems to me the the file off the user with this user name but omit the fields password 09:23.220 --> 09:28.740 and amid the fields ID because they don't want the user to see you know to transmit to him the hashed 09:28.740 --> 09:29.280 password. 09:29.280 --> 09:29.550 Right. 09:29.550 --> 09:33.620 It doesn't make sense and it doesn't make sense to send him the underscore ID. 09:33.630 --> 09:34.060 OK. 09:34.200 --> 09:38.590 So I'm going to make both of these Troung being sent in get. 09:39.180 --> 09:39.630 All right. 09:39.660 --> 09:43.490 And then of course zero because that's the first person right. 09:43.500 --> 09:46.590 There's only one person to find. 09:46.650 --> 09:47.480 OK. 09:47.730 --> 09:50.580 So now what we need to do is to simply return. 09:50.610 --> 09:54.330 Jason if I return Jason and that's it. 09:54.390 --> 09:56.340 And we have basically we are done. 09:56.460 --> 09:57.300 OK. 09:57.620 --> 10:03.570 And we're done with the class we have gotten that balance the bounce information for this user and can 10:03.570 --> 10:09.950 tell you what the user what his balance is what he owns and what he what that he has. 10:10.020 --> 10:11.390 OK. 10:12.120 --> 10:12.600 OK. 10:12.630 --> 10:16.680 So now the last two classes that we have so let's go back here. 10:16.860 --> 10:20.860 So now we're done with the check balance and that we need to take a loan and pay low. 10:20.890 --> 10:22.110 OK. 10:22.830 --> 10:27.410 So the first one is the the payload. 10:27.450 --> 10:35.490 OK slow or let's do the take long first class take loan and then we're going to do research 10:38.070 --> 10:42.570 and we're going to define the post function on itself because all of them are ghosts. 10:43.080 --> 10:45.060 And then we're going to get the posted data. 10:45.070 --> 10:48.910 So the data is equal to request I get discouraged. 10:49.480 --> 10:56.310 We're going to get the user name is equal to posted data username 10:59.950 --> 11:07.310 you're also going to get the password from the post posted data to who posted data password. 11:07.930 --> 11:08.710 OK. 11:08.920 --> 11:14.080 Now what else do or are we going to get where we want to know how much money does the user want to take 11:14.080 --> 11:15.160 as loans or what to do. 11:15.160 --> 11:19.780 Money is equal to posted data amount. 11:19.840 --> 11:20.980 OK. 11:21.580 --> 11:22.030 All right. 11:22.060 --> 11:26.580 So the first step is as usual verify that the credentials are correct. 11:26.650 --> 11:34.110 So return Jason and password is equal to verify the credentials. 11:34.280 --> 11:38.610 And then with this username and password then. 11:38.660 --> 11:40.540 So this one should be here. 11:41.300 --> 11:44.740 So return Jason an air is able to verify credentials. 11:44.740 --> 11:50.150 Then again I say if there then return this on if I return Jason. 11:50.180 --> 11:51.100 OK. 11:51.540 --> 11:59.640 All right now there is no ears that I need to see the cash with the user and his debt. 11:59.890 --> 12:02.630 And then I need to increase his cash and his debt. 12:02.680 --> 12:03.340 OK. 12:03.340 --> 12:07.200 So when I do cash is you go to cash with the user. 12:07.770 --> 12:10.420 You don't want to do. 12:10.420 --> 12:16.380 Debt is equal to cash with user or debt. 12:16.380 --> 12:19.250 True these are some that this one isn't cash with the user. 12:19.270 --> 12:27.800 This one's going to be debt whether user user name that are going to say update account. 12:28.000 --> 12:31.690 So I'm going to update the account the user name. 12:32.410 --> 12:33.080 OK. 12:33.340 --> 12:36.940 And then I'm going to add change to happen cash plus money. 12:37.030 --> 12:41.920 So now this user has withdrawn or took a loan off this money. 12:41.950 --> 12:42.320 Right. 12:42.350 --> 12:44.440 Of this amount from the bank. 12:44.440 --> 12:50.800 So I'm going to increase his own by this money so if you're for example you have zero debt and you have 12:50.800 --> 12:52.900 zero money in the bank account. 12:52.930 --> 12:56.360 So if you take a loan will you increase your money by two. 12:56.410 --> 12:58.610 Let's say you take a loan of $200. 12:58.710 --> 13:01.190 Then you increase your account by $200. 13:01.290 --> 13:10.810 But you also increase your debt so update debt here increase your debt with so that it's the previous 13:10.810 --> 13:17.280 debt plus then you know that you took the new loan that that your debt is now OK. 13:17.530 --> 13:20.600 And then now you can just return Jason if I 13:23.230 --> 13:27.500 generate return dictionary and then we're going to say 200. 13:27.790 --> 13:34.470 And then a message for example loan added to your account. 13:34.510 --> 13:35.230 OK. 13:35.680 --> 13:39.910 So that's basically you're saying the loan was added to your account as a money. 13:40.490 --> 13:40.960 OK. 13:40.990 --> 13:47.380 So the last class that we're going on right is finally class pillow cases where he is going to be the 13:47.440 --> 13:48.790 opposite of this class. 13:48.790 --> 13:50.570 Exactly the opposite right. 13:50.650 --> 13:58.150 Because what we're doing is well we're taking away the debt subtracting the debt that he has. 13:58.150 --> 13:58.710 OK. 13:58.870 --> 14:04.780 So when do you class pay the loan and then resource. 14:05.390 --> 14:07.730 Then we're going to find the post function. 14:07.750 --> 14:08.670 So. 14:08.980 --> 14:09.820 All right. 14:10.180 --> 14:16.280 And then we're going to get first of all as usual Vost and Dana and you go to request that get underscored 14:16.330 --> 14:20.990 any on that we're going to use your name is equal to posted Nina. 14:21.160 --> 14:27.970 You didn't name and password UKL the posted data password. 14:29.690 --> 14:35.790 And then money is equal to the posted data amount. 14:36.400 --> 14:37.620 OK cool. 14:37.680 --> 14:38.820 So far so good. 14:38.820 --> 14:45.480 Now we checked the credentials. 14:47.280 --> 14:49.370 And then we see if there is any error. 14:49.380 --> 14:57.930 So if there then return your son if I turn Jason the Greek or answer once we're done with that we want 14:57.930 --> 15:06.740 to check how much money is they use your house we say cash is equal to cash with user on the username 15:08.970 --> 15:15.280 McCain and then I'm going to say if cash is less than money say the cash is less than the amount that 15:15.280 --> 15:17.680 he's paying that he doesn't have enough money. 15:17.720 --> 15:28.420 So I'm going to say return the sun if I generate return dictionary of three or three and then not enough 15:28.600 --> 15:31.040 cash in your account. 15:31.090 --> 15:32.150 OK. 15:32.930 --> 15:34.160 And we're done. 15:34.690 --> 15:37.560 If on the other hand this is not true then I'm going to do. 15:37.570 --> 15:41.120 Debt is equal to debt with the user. 15:41.110 --> 15:47.350 So when I see how much debt does he have then I'm going to subtract the amount. 15:47.350 --> 15:53.920 So the the accounts are going to subtract the amount that he paid from his from what he owns. 15:54.400 --> 15:56.580 So I'm going to do cash. 15:56.590 --> 16:03.790 So the previous cash that he had minus money and now and then add subtract also what he goes to the 16:03.790 --> 16:13.330 bank to do update debt and then this username with debt minus moneys and such like this amount from 16:13.330 --> 16:14.100 his debt. 16:14.110 --> 16:15.020 OK. 16:15.550 --> 16:16.590 And that should be it. 16:16.660 --> 16:26.450 And we're just going to return to the user return on if I generate return dictionary of 200. 16:26.710 --> 16:34.910 You've successfully paid your loan something like that or your loan in Spain. 16:35.030 --> 16:37.270 Ok done. 16:37.540 --> 16:42.690 So the only thing left to do is to actually add the resources or are going to do it API. 16:42.920 --> 16:44.910 And underscore resource. 16:45.470 --> 16:49.500 And then I'm going to copy that and then I copy it since we have six classes. 16:49.660 --> 16:51.730 So I'm going to copy that six times. 16:51.760 --> 16:52.110 OK. 16:52.130 --> 16:55.710 So one two three four five six. 16:55.810 --> 16:56.340 OK. 16:56.650 --> 17:01.920 So we have the register class which is at slash register. 17:02.950 --> 17:06.390 We have the case let's go back here. 17:06.850 --> 17:16.120 All the spaces we have the add which is add slash and we have also the transfer. 17:16.140 --> 17:17.040 Right. 17:17.950 --> 17:21.090 And slash transfer. 17:21.730 --> 17:22.470 We have. 17:22.510 --> 17:23.470 What else do we have. 17:23.470 --> 17:29.300 So we have the transfer you have also the balance which is at slash balance. 17:29.530 --> 17:36.700 And finally we're now finally we have two new ones which appear to take low and the payload to each 17:36.700 --> 17:42.150 of them and take loan and the other one is at payload bay. 17:42.400 --> 17:48.700 So pay long and slash the loan so that all the resources into our API. 17:48.820 --> 17:59.170 Now the last thing we do is you say if name is equal to underscore main then at door around then host 17:59.170 --> 18:02.990 is equal to zero point zero point zero point zero. 18:03.030 --> 18:04.310 Okay. 18:05.140 --> 18:06.040 And that's it. 18:06.040 --> 18:10.410 So we have successfully written and finished the entire API. 18:11.260 --> 18:15.610 So we're going to stop here and in the next video we're going to be testing the entire API and seeing 18:16.330 --> 18:18.640 how it works. 18:18.640 --> 18:23.890 We're going to do several accounts and see how we can transfer money from one account to the other and 18:23.890 --> 18:24.650 so on. 18:25.330 --> 18:28.440 So we're going to stop here and we're going to complete the next video. 18:28.480 --> 18:30.400 So until the next video decoding.