1 00:00:07,960 --> 00:00:10,720 Hey everybody this is Calleigh began with Deb slopes dot com. 2 00:00:10,720 --> 00:00:15,350 And in this video I'm so excited we're going to create our core data model. 3 00:00:15,460 --> 00:00:22,210 OK this is going to allow us to create a core data entity and give it some core data attributes as well. 4 00:00:22,210 --> 00:00:28,180 And basically this is going to be our data model how we're going to store objects of type goal in our 5 00:00:28,180 --> 00:00:33,240 app and then later we'll be able to fetch them and pull them all up into our table view to display them. 6 00:00:33,340 --> 00:00:34,740 Really cool stuff. 7 00:00:34,750 --> 00:00:38,580 Let's go ahead and let's pull open our X code project and let's go set it up. 8 00:00:39,180 --> 00:00:39,560 OK. 9 00:00:39,580 --> 00:00:45,490 So to do that what we have done already is when we built this project from the beginning when we created 10 00:00:45,490 --> 00:00:53,080 it we ticked include core data so that automatically creates what's called an X C data model D and it 11 00:00:53,080 --> 00:00:55,360 is the same name as our project. 12 00:00:55,360 --> 00:00:59,820 So I'm actually going to close the assistant editor here and this is it. 13 00:00:59,830 --> 00:01:01,670 This is the core data interface. 14 00:01:01,670 --> 00:01:05,040 Now there are a few things let me just show you around a little bit. 15 00:01:05,080 --> 00:01:08,170 There's a section here for entities will talk about that in a second. 16 00:01:08,200 --> 00:01:11,660 There's a section for fecche requests we're not going to use this feature. 17 00:01:11,860 --> 00:01:14,500 We'll do it in code but we're not going to do it here. 18 00:01:14,530 --> 00:01:16,560 And then there are configurations. 19 00:01:17,200 --> 00:01:19,400 Now this displays your entities. 20 00:01:19,540 --> 00:01:23,450 And later we'll show you the attributes section. 21 00:01:23,460 --> 00:01:27,880 This of course on the side is just some information and this will I will show you what this isn't just 22 00:01:27,880 --> 00:01:30,770 a second as you see when I hover over it. 23 00:01:30,770 --> 00:01:35,180 It'll pop up a name here and it is the data model inspector that is. 24 00:01:35,200 --> 00:01:36,440 We'll use that in just a little bit. 25 00:01:36,460 --> 00:01:42,520 But for now let's go ahead and let's create our entity think of this just like a model layer for any 26 00:01:42,520 --> 00:01:43,740 other app that you're going to build. 27 00:01:43,870 --> 00:01:44,340 OK. 28 00:01:44,560 --> 00:01:49,650 An entity is like a model or like a class can then attributes are just like properties. 29 00:01:49,660 --> 00:01:53,740 So go ahead and click add entity and we get a blank entity. 30 00:01:53,740 --> 00:01:59,050 Now there are attributes relationships and fetched properties in this app we're only going to focus 31 00:01:59,050 --> 00:02:01,920 on attributes but relationships and fetch properties. 32 00:02:01,930 --> 00:02:06,060 I really encourage you to dive in deep and get to know what those are. 33 00:02:06,150 --> 00:02:06,690 OK. 34 00:02:06,910 --> 00:02:11,320 Now our entity we don't want to name it entity because that's just kind of a generic name. 35 00:02:11,320 --> 00:02:12,220 We're going to rename it. 36 00:02:12,220 --> 00:02:18,310 So right click or sorry click on it once and then you can basically edit the name Kay. 37 00:02:18,520 --> 00:02:22,520 So this will not be called entity but instead we're going to call it goal. 38 00:02:22,640 --> 00:02:27,490 Think of this as if we were to make a model layer called goal we would set up some properties and we 39 00:02:27,490 --> 00:02:33,430 would create an initializer to set those values whenever we instantiate an instance of our goal model. 40 00:02:33,430 --> 00:02:35,850 But we're going to use core data instead of doing that. 41 00:02:35,850 --> 00:02:36,970 It's really cool. 42 00:02:36,970 --> 00:02:44,350 So think of goal as our class and the attributes are like our properties so what does a goal need. 43 00:02:44,350 --> 00:02:47,070 Click an item and this is our first property. 44 00:02:47,080 --> 00:02:49,150 But in Chordata It's called an attribute. 45 00:02:49,150 --> 00:02:49,690 OK. 46 00:02:50,020 --> 00:02:53,450 So we're going to call this goal description. 47 00:02:53,570 --> 00:02:54,160 OK. 48 00:02:54,430 --> 00:02:57,530 And it's type we need to set explicitly right here. 49 00:02:57,550 --> 00:03:00,700 Now of course like before the goal description is just text. 50 00:03:00,700 --> 00:03:03,240 So we can give it a value of type string. 51 00:03:03,280 --> 00:03:09,010 You'll notice on the side here in the data model inspector you can see that we can give it a name. 52 00:03:09,010 --> 00:03:14,980 We can set some properties here the attribute type and there's all kinds of complex validation and a 53 00:03:14,980 --> 00:03:16,820 default value we can set. 54 00:03:17,090 --> 00:03:21,700 There's all kinds of complex stuff that you can set in here but for now we just need to give a name 55 00:03:21,700 --> 00:03:22,970 and said it's type. 56 00:03:23,080 --> 00:03:24,030 So let's keep going. 57 00:03:24,070 --> 00:03:29,950 Let's go ahead and set a goal type and that is also going to be string. 58 00:03:30,120 --> 00:03:30,650 OK. 59 00:03:30,880 --> 00:03:34,840 Now that's for short term or long term which of course is textual data. 60 00:03:34,840 --> 00:03:38,250 So we need to use a string came very cool. 61 00:03:38,740 --> 00:03:42,690 Next we're going to go ahead and create a new attribute. 62 00:03:42,780 --> 00:03:43,240 OK. 63 00:03:43,340 --> 00:03:46,530 We're still thinking of these like properties in a class. 64 00:03:47,470 --> 00:03:53,410 We need to set a value for the total number that a goal needs in order to be completed. 65 00:03:53,410 --> 00:03:56,820 So let's say I wanted to eat salad once a week for four weeks. 66 00:03:56,950 --> 00:03:58,950 The number to complete would be four. 67 00:03:58,960 --> 00:04:02,340 And I would increment it by one every time. 68 00:04:02,440 --> 00:04:09,150 So we're going to call that goal completion value. 69 00:04:09,160 --> 00:04:13,150 How about that goal completion value because that's the value that we need in order to complete the 70 00:04:13,150 --> 00:04:14,050 goal. 71 00:04:14,140 --> 00:04:21,570 So to save this we're going to use an integer 32 that means it's a 32 bit integer and we're using an 72 00:04:21,570 --> 00:04:27,970 int 32 simply because it is easier for us to access in code and we can't set a regular integer this 73 00:04:27,970 --> 00:04:28,460 way. 74 00:04:28,630 --> 00:04:31,250 Now we could use a double decimal afloat. 75 00:04:31,270 --> 00:04:33,870 All that stuff but 32 is what we're going to use. 76 00:04:34,240 --> 00:04:37,250 And next we're going to add one final attribute. 77 00:04:37,450 --> 00:04:45,820 We have a value held for the completion value but now we also need to set a value to monitor the progress. 78 00:04:45,820 --> 00:04:51,460 Let's say that we have swiped and we have completed one week we would set that value to be 1 then we 79 00:04:51,460 --> 00:04:55,880 swipe again and we tap on ADD 1 then we would set it to be 2 etc. etc.. 80 00:04:56,050 --> 00:04:59,350 So we're going to call that goal progress. 81 00:04:59,470 --> 00:04:59,770 OK. 82 00:04:59,770 --> 00:05:03,250 Because that is the value that set to monitor the progress. 83 00:05:03,280 --> 00:05:04,500 Very very cool. 84 00:05:04,570 --> 00:05:08,430 And now we are done our model is done we have a name. 85 00:05:08,570 --> 00:05:09,720 We have four attributes. 86 00:05:09,740 --> 00:05:11,880 Oops sorry forgot to set a type here. 87 00:05:11,880 --> 00:05:13,360 Select 32. 88 00:05:13,730 --> 00:05:17,630 And we now have our attributes totally set up. 89 00:05:17,810 --> 00:05:22,430 I just want to show you how easy it is to set up this core data entity in a controller. 90 00:05:22,430 --> 00:05:26,030 Now we're not going to actually use this I just want to show you how you would do it if you were going 91 00:05:26,030 --> 00:05:27,180 to. 92 00:05:27,380 --> 00:05:31,250 So we're going to pretend just that this is just like any other class. 93 00:05:31,370 --> 00:05:37,760 We're going to import core data first and we're going to go ahead and type let goal equals and you know 94 00:05:37,760 --> 00:05:42,980 what if this was a model error like if we had a swift file here if it was a class we could just type 95 00:05:43,070 --> 00:05:44,040 goal. 96 00:05:44,040 --> 00:05:45,620 Do you see how that pops up here. 97 00:05:45,680 --> 00:05:46,800 That's so cool. 98 00:05:46,940 --> 00:05:52,580 If we go ahead and give it a parentheses and we just set it to be an empty goal just like that you'll 99 00:05:52,580 --> 00:05:57,780 see if I click on the print here if I build it it's going to say it was never used. 100 00:05:57,860 --> 00:05:58,850 That's fine. 101 00:05:58,850 --> 00:06:03,270 I just need to show the color here so I can show you what's actually inside. 102 00:06:03,270 --> 00:06:06,800 This looks like it's not going to let me and that's fine. 103 00:06:06,800 --> 00:06:10,940 But what I can do is check this out I can type goal dot and look at this. 104 00:06:10,940 --> 00:06:13,570 These are all of my properties that I just set. 105 00:06:13,580 --> 00:06:18,150 So now I have an instance of my core data models model. 106 00:06:18,170 --> 00:06:22,450 Like I can use this I can set the completion value to be equal to 32. 107 00:06:23,030 --> 00:06:29,660 And I can pass in a value let's say passed in a double of twelve point zero. 108 00:06:29,930 --> 00:06:35,420 I could set that right now I could just set my model it's so easy to actually implement this X code 109 00:06:35,660 --> 00:06:36,380 Apple. 110 00:06:36,410 --> 00:06:39,620 The whole team they've just made it so easy to use core data. 111 00:06:39,620 --> 00:06:42,170 There's no reason for you to not be using it in your app. 112 00:06:42,170 --> 00:06:47,540 A lot of people for a long time have been really hesitant to use core data just because it's been really 113 00:06:47,540 --> 00:06:51,690 complicated and there's all kinds of like extra things you need to do in order to use it. 114 00:06:51,740 --> 00:06:58,040 But Apple has made most of it pretty much automatic and you can use it almost interchangeably with a 115 00:06:58,040 --> 00:07:03,260 normal model layer which I think actually saves you a lot of time it's really efficient and it's just 116 00:07:03,260 --> 00:07:04,800 an amazing way to do it. 117 00:07:04,820 --> 00:07:08,970 So we have our core data entity saved. 118 00:07:09,010 --> 00:07:13,090 Ok this is our model which as you remember from the previous video. 119 00:07:13,220 --> 00:07:14,920 This is our managed object model. 120 00:07:14,960 --> 00:07:17,220 Now it's going to be passed into the ER. 121 00:07:17,240 --> 00:07:21,250 It's going to be used in order to instantiate the persistent storage container. 122 00:07:21,530 --> 00:07:27,680 And after that it's going to be used with the managed object context in order to pull and save and load 123 00:07:27,680 --> 00:07:29,900 data from our persistent store. 124 00:07:29,900 --> 00:07:32,720 So so cool guys amazing work. 125 00:07:32,720 --> 00:07:33,190 And you know what. 126 00:07:33,190 --> 00:07:37,880 In the next video we're going to go ahead and we're going to set up our goal cells to be displaying 127 00:07:37,880 --> 00:07:43,880 in our goals Visi table view and we're also going to write an enum in order to create different gold 128 00:07:43,880 --> 00:07:44,570 types. 129 00:07:44,570 --> 00:07:48,980 Now we'll get back to using this goal entity a little bit later but for now let's look at our table 130 00:07:48,980 --> 00:07:50,240 view set up and working. 131 00:07:50,390 --> 00:07:55,360 Let's let our brain digest all of this and process all of this and we'll continue to use core data in 132 00:07:55,370 --> 00:07:56,840 a few videos in the future. 133 00:07:56,840 --> 00:07:57,730 Amazing job. 134 00:07:57,740 --> 00:07:58,900 And let's move on.