1 00:00:08,000 --> 00:00:10,780 Hey everybody this is Caleb began with slopes dot com. 2 00:00:10,790 --> 00:00:15,460 And in this video I'm so excited we're going to create our core data model. 3 00:00:15,730 --> 00:00:22,200 This is going to allow us to create a core data entity and give it some core data attributes as well. 4 00:00:22,250 --> 00:00:28,250 And basically this is going to be our data model how we're going to store objects of type goal in our 5 00:00:28,250 --> 00:00:33,290 app and then later we'll be able to fetch them and pull them all up into our table view to display them. 6 00:00:33,380 --> 00:00:34,820 Really cool stuff. 7 00:00:34,820 --> 00:00:38,940 Let's go ahead and let's pull open our X code project and let's go set it up. 8 00:00:39,250 --> 00:00:39,600 OK. 9 00:00:39,620 --> 00:00:45,560 So to do that what we have done already is when we built this project from the beginning when we created 10 00:00:45,560 --> 00:00:53,150 it we ticked include core data so that automatically creates what's called an X C data model D and it 11 00:00:53,150 --> 00:00:59,600 is the same name as our project so I'm actually going to close the assistant editor here and this is 12 00:00:59,600 --> 00:00:59,880 it. 13 00:00:59,880 --> 00:01:01,610 This is the core data interface. 14 00:01:01,610 --> 00:01:03,170 Now there are a few things. 15 00:01:03,170 --> 00:01:05,110 Let me just show you around a little bit. 16 00:01:05,150 --> 00:01:08,110 There's a section here for entities will talk about that in a second. 17 00:01:08,240 --> 00:01:10,040 There's a section for fecche requests. 18 00:01:10,040 --> 00:01:11,770 We're not going to use this feature. 19 00:01:11,930 --> 00:01:14,330 We'll do it in code but we're not going to do it here. 20 00:01:14,570 --> 00:01:16,670 And then there are configurations. 21 00:01:16,680 --> 00:01:19,470 K now this displays your entities. 22 00:01:19,610 --> 00:01:23,510 And later we'll show you the attributes section. 23 00:01:23,540 --> 00:01:27,920 This is of course on the side is just some information and this will I will show you this isn't just 24 00:01:27,920 --> 00:01:30,780 a second as you see when I hover over it. 25 00:01:30,840 --> 00:01:35,250 It'll pop up a name here and it is the data model inspector that is. 26 00:01:35,270 --> 00:01:36,510 We'll use that in just a little bit. 27 00:01:36,530 --> 00:01:42,560 But for now let's go ahead and let's create our entity think of this just like a model layer for any 28 00:01:42,560 --> 00:01:43,890 other app that you're going to build. 29 00:01:43,910 --> 00:01:44,530 OK. 30 00:01:44,630 --> 00:01:47,920 An entity is like a model or like a class can then. 31 00:01:47,920 --> 00:01:49,660 Attributes are just like properties. 32 00:01:49,730 --> 00:01:53,800 So go ahead and click add entity and we get a blank entity. 33 00:01:53,810 --> 00:01:59,120 Now there are attributes relationships and fetched properties in this app we're only going to focus 34 00:01:59,120 --> 00:02:01,970 on attributes but relationships and fetch properties. 35 00:02:02,000 --> 00:02:06,110 I really encourage you to dive in deep and get to know what those are. 36 00:02:06,200 --> 00:02:06,710 OK. 37 00:02:06,980 --> 00:02:11,360 Now our entity we don't want to name it entity because that's just kind of a generic name. 38 00:02:11,360 --> 00:02:12,290 We're going to rename it. 39 00:02:12,290 --> 00:02:18,480 So right click or sorry click on it once and then you can basically edit the name Kay. 40 00:02:18,560 --> 00:02:22,330 So this will not be called entity but instead we're going to call it goal. 41 00:02:22,440 --> 00:02:22,700 OK. 42 00:02:22,700 --> 00:02:27,560 Think of this as if we were to make a model layer called goal we would set up some properties and we 43 00:02:27,560 --> 00:02:33,500 would create an initialiser to set those values whenever we instantiate an instance of our goal model. 44 00:02:33,500 --> 00:02:37,040 But we're going to use core data instead of doing that it's really cool. 45 00:02:37,040 --> 00:02:44,380 So we think of goal as our class and the attributes are like our properties so what does a goal need. 46 00:02:44,390 --> 00:02:47,140 Click an item and this is our first property. 47 00:02:47,150 --> 00:02:49,090 But in core data it's called an attribute. 48 00:02:49,220 --> 00:02:49,870 OK. 49 00:02:50,090 --> 00:02:53,270 So we're going to call this goal description. 50 00:02:53,630 --> 00:02:54,200 OK. 51 00:02:54,500 --> 00:02:55,420 And it's type. 52 00:02:55,430 --> 00:02:57,460 We need to set explicitly right here. 53 00:02:57,620 --> 00:03:03,350 Now of course like before the goal description is just text so we can give it a value of type string. 54 00:03:03,350 --> 00:03:09,140 You'll notice on the side here in the data model inspector you can see that we can give it a name we 55 00:03:09,140 --> 00:03:11,960 can set some properties here the attribute type. 56 00:03:11,960 --> 00:03:17,090 And there's all kinds of complex validation and a default value we can set. 57 00:03:17,150 --> 00:03:19,510 There's all kinds of complex stuff that you can set in here. 58 00:03:19,520 --> 00:03:23,030 But for now we just need to give a name and said it's type. 59 00:03:23,150 --> 00:03:24,090 So let's keep going. 60 00:03:24,140 --> 00:03:30,000 Let's go ahead and set a goal type and that is also going to be string. 61 00:03:30,170 --> 00:03:30,950 OK. 62 00:03:30,950 --> 00:03:34,870 Now that's for short term or long term which of course is textual data. 63 00:03:34,880 --> 00:03:38,810 So we need to use a string came very cool. 64 00:03:38,810 --> 00:03:42,710 Next we're going to go ahead and create a new attribute. 65 00:03:43,110 --> 00:03:46,530 We're just we're still thinking of these like properties in a class. 66 00:03:46,670 --> 00:03:47,260 OK. 67 00:03:47,510 --> 00:03:53,470 We need to set a value for the total number that a goal needs in order to be completed. 68 00:03:53,470 --> 00:03:56,890 So let's say I wanted to eat salad once a week for four weeks. 69 00:03:56,990 --> 00:03:59,020 The number to complete would be four. 70 00:03:59,030 --> 00:04:02,420 And I would increment it by one every time. 71 00:04:02,510 --> 00:04:09,150 So we're going to call that goal completion value. 72 00:04:09,230 --> 00:04:10,780 How about that goal completion value. 73 00:04:10,790 --> 00:04:14,100 Because that's the value that we need in order to complete the goal. 74 00:04:14,180 --> 00:04:18,320 So to save this we're going to use an integer 32. 75 00:04:18,320 --> 00:04:24,890 That means it's a 32 bit integer and we're using in 32 simply because it is easier for us to access 76 00:04:24,890 --> 00:04:28,660 in code and we can't set a regular integer this way. 77 00:04:28,670 --> 00:04:31,300 Now we could use a double a decimal afloat. 78 00:04:31,310 --> 00:04:34,170 All that stuff but 32 is what we're going to use. 79 00:04:34,310 --> 00:04:37,270 And next we're going to add one final attribute. 80 00:04:37,520 --> 00:04:45,890 We have a value held for the completion value but now we also need to set a value to monitor the progress. 81 00:04:45,890 --> 00:04:51,280 Let's say that we have swiped and we have completed one week we would set that value to be 1. 82 00:04:51,290 --> 00:04:56,070 Then we swipe again and we tap on ADD 1 then we would set it to be 2 cetera et cetera. 83 00:04:56,090 --> 00:04:59,750 So we're going to call that goal progress. 84 00:04:59,840 --> 00:05:03,350 Because that is the value that set to monitor the progress. 85 00:05:03,350 --> 00:05:04,430 Very very cool. 86 00:05:04,610 --> 00:05:06,610 And now we are done. 87 00:05:06,740 --> 00:05:08,490 Our model is done we have a name. 88 00:05:08,630 --> 00:05:09,780 We have four attributes. 89 00:05:09,800 --> 00:05:11,930 Oops sorry forgot to set a type here. 90 00:05:11,930 --> 00:05:13,400 Select 32. 91 00:05:13,790 --> 00:05:17,680 And we now have our attributes totally set up. 92 00:05:17,840 --> 00:05:22,490 I just want to show you how easy it is to set up this core data entity in a controller. 93 00:05:22,490 --> 00:05:26,090 Now we're not going to actually use this I just want to show you how you would do it if you were going 94 00:05:26,090 --> 00:05:27,250 to. 95 00:05:27,440 --> 00:05:31,310 So we're going to pretend just that this is just like any other class. 96 00:05:31,430 --> 00:05:37,820 We're going to import core data first and we're going to go ahead and type let goal equals and you know 97 00:05:37,820 --> 00:05:43,040 what if this was a model error like if we had a swift file here if it was a class we could just type 98 00:05:43,130 --> 00:05:44,030 goal. 99 00:05:44,110 --> 00:05:45,680 Do you see how that pops up here. 100 00:05:45,740 --> 00:05:47,000 That's so cool. 101 00:05:47,000 --> 00:05:52,640 If we go ahead and give it a parentheses and we just set it to be an empty goal just like that you'll 102 00:05:52,640 --> 00:05:57,830 see if I click on the parentheses here if I build it it's going to say it was never used. 103 00:05:57,920 --> 00:05:58,910 That's fine. 104 00:05:58,910 --> 00:06:03,330 I just need to show the color here so I can show you what's actually inside. 105 00:06:03,330 --> 00:06:06,860 This looks like it's not going to let me and that's fine. 106 00:06:06,860 --> 00:06:10,970 But what I can do is check this out I can type goal dot and look at this. 107 00:06:10,970 --> 00:06:13,620 These are all of my properties that I just set. 108 00:06:13,640 --> 00:06:18,210 So now I have an instance of my core data models model. 109 00:06:18,230 --> 00:06:22,530 Like I can use this I can set the completion value to be equal to 32. 110 00:06:23,090 --> 00:06:29,730 And I can pass in a value let's say passed in a double of twelve point zero. 111 00:06:29,990 --> 00:06:35,480 I could set that right now I could just set my model it's so easy to actually implement this X code 112 00:06:35,720 --> 00:06:36,410 Apple. 113 00:06:36,440 --> 00:06:39,670 The whole team they've just made it so easy to use core data. 114 00:06:39,680 --> 00:06:42,100 There's no reason for you to not be using it in your app. 115 00:06:42,230 --> 00:06:47,600 A lot of people for a long time have been really hesitant to use core data just because it's been really 116 00:06:47,600 --> 00:06:51,750 complicated and there's all kinds of like extra things you need to do in order to use it. 117 00:06:51,800 --> 00:06:58,100 But Apple has made most of it pretty much automatic and you can use it almost interchangeably with a 118 00:06:58,100 --> 00:07:03,320 normal model layer which I think actually saves you a lot of time it's really efficient and it's just 119 00:07:03,320 --> 00:07:04,860 an amazing way to do it. 120 00:07:04,880 --> 00:07:08,910 So we have our core data entity saved. 121 00:07:09,290 --> 00:07:13,150 This is our model which as you remember from the previous video. 122 00:07:13,280 --> 00:07:14,990 This is our managed object model. 123 00:07:15,020 --> 00:07:17,260 Now it's going to be passed in to the ER. 124 00:07:17,300 --> 00:07:21,310 It's going to be used in order to instantiate the persistent storage container. 125 00:07:21,590 --> 00:07:27,710 And after that it's going to be used with the managed object context in order to pull and save and load 126 00:07:27,710 --> 00:07:29,920 data from our persistent store. 127 00:07:29,960 --> 00:07:32,670 So so cool guys amazing work. 128 00:07:32,780 --> 00:07:33,250 And you know what. 129 00:07:33,250 --> 00:07:37,910 In the next video we're going to go ahead and we're going to set up our goal cells to be displaying 130 00:07:37,910 --> 00:07:43,940 in our goals Visi table view and we're also going to write an enum in order to create different gold 131 00:07:43,940 --> 00:07:44,630 types. 132 00:07:44,630 --> 00:07:49,040 Now we'll get back to using this goal entity a little bit later but for now let's look at our table 133 00:07:49,040 --> 00:07:50,400 view set up and working. 134 00:07:50,450 --> 00:07:55,430 Let's let our brain digest all of this and process all of this and we'll continue to use core data in 135 00:07:55,430 --> 00:07:56,900 a few videos in the future. 136 00:07:56,900 --> 00:07:57,790 Amazing job. 137 00:07:57,800 --> 00:07:59,010 And let's move on.