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diff --git a/usth/ICT2.7/P3L2 A Tale of Analysis and Design Subtitles/7 - Refining Relationships - lang_en.srt b/usth/ICT2.7/P3L2 A Tale of Analysis and Design Subtitles/7 - Refining Relationships - lang_en.srt deleted file mode 100644 index 44f9165..0000000 --- a/usth/ICT2.7/P3L2 A Tale of Analysis and Design Subtitles/7 - Refining Relationships - lang_en.srt +++ /dev/null @@ -1,188 +0,0 @@ -1 -00:00:00,350 --> 00:00:03,460 -Spencer, I gotta tell you, I'm impressed. - -2 -00:00:03,460 --> 00:00:05,441 -You're getting very good at this. So, why - -3 -00:00:05,441 --> 00:00:07,190 -don't you go wild and continue, there - -4 -00:00:07,190 --> 00:00:09,240 -anything else you think we can improve here? - -5 -00:00:09,240 --> 00:00:11,800 ->> Well something was bothering - -6 -00:00:11,800 --> 00:00:14,600 -me, that what happens if there's more - -7 -00:00:14,600 --> 00:00:19,110 -than one book with the same title and somebody puts in a request? - -8 -00:00:19,110 --> 00:00:25,360 ->> Oh, I see. That's a good point. So basically what you are telling me is - -9 -00:00:25,360 --> 00:00:28,630 -there's kind of a difference between an item and - -10 -00:00:28,630 --> 00:00:30,660 -the title, so the title is kind of a more - -11 -00:00:30,660 --> 00:00:32,940 -general concept, in a sense. So if you can - -12 -00:00:32,940 --> 00:00:35,830 -have multiple copies of a given title, is that right? - -13 -00:00:35,830 --> 00:00:38,460 ->> Yeah, we have five copies of Tom Sawyer, and the - -14 -00:00:38,460 --> 00:00:42,810 -persons, the patrons, really putting in a request for any Tom Sawyer. - -15 -00:00:42,810 --> 00:00:45,332 ->> They don't want like copy number three of Tom Sawyer, right? They want, - -16 -00:00:45,332 --> 00:00:50,530 -they want to read Tom Sawyer. Okay and I can represent that. So, in which - -17 -00:00:50,530 --> 00:00:55,230 -I suggest we do that, and you can tell me whether it makes sense to you is by - -18 -00:00:55,230 --> 00:00:59,650 -introducing an additional class, which I call Title. And - -19 -00:00:59,650 --> 00:01:02,614 -that represents exactly the concept that you're mentioning. So - -20 -00:01:02,614 --> 00:01:04,666 -this is a title which represents some - -21 -00:01:04,666 --> 00:01:09,180 -specific content. That is not related to a specific - -22 -00:01:09,180 --> 00:01:12,110 -physical element. Like it can be rated to multiple, - -23 -00:01:12,110 --> 00:01:15,520 -physical elements. So basically I'm going to create this title. - -24 -00:01:15,520 --> 00:01:18,100 -And then I'm going to create a relationship between - -25 -00:01:18,100 --> 00:01:20,500 -the title and the item. And what - -26 -00:01:20,500 --> 00:01:22,530 -the relationship is telling me, the the association - -27 -00:01:22,530 --> 00:01:25,512 -between these two in this case. Is an association, - -28 -00:01:25,512 --> 00:01:30,320 -that we call aggregation. So it's a special kind of association, that basically - -29 -00:01:30,320 --> 00:01:35,450 -indicates that an item of this type, so a title can - -30 -00:01:35,450 --> 00:01:40,692 -consist of a multiple elements of this type of multiple items. - -31 -00:01:40,692 --> 00:01:42,710 -So it's telling me that one title can - -32 -00:01:42,710 --> 00:01:45,700 -consist of multiple items, and I'm going to indicate - -33 -00:01:45,700 --> 00:01:48,560 -it with this annotation, which is a this - -34 -00:01:49,700 --> 00:01:53,200 -diamond at the top of the association. - -35 -00:01:53,200 --> 00:01:55,570 ->> And so we can move our request - -36 -00:01:55,570 --> 00:01:57,510 -line, up from loanable item to - -37 -00:01:57,510 --> 00:01:59,010 -title, because that's what they're really requesting. - -38 -00:01:59,010 --> 00:02:00,710 ->> Definitely, definitely, and in fact, - -39 -00:02:00,710 --> 00:02:02,420 -you know, that represents exactly the situation - -40 -00:02:02,420 --> 00:02:06,350 -that you are mentioning, at this point when the patron makes a request. - -41 -00:02:06,350 --> 00:02:12,240 -It makes a request to a title and not to a loanable item. And then, and - -42 -00:02:12,240 --> 00:02:15,420 -when the actual loan will take place, - -43 -00:02:15,420 --> 00:02:18,420 -then that will be connected to a specific item. - -44 -00:02:18,420 --> 00:02:20,090 ->> Right. Okay that makes sense. - -45 -00:02:20,090 --> 00:02:20,388 ->> Makes sense? - -46 -00:02:20,388 --> 00:02:20,779 ->> Yeah. - -47 -00:02:20,779 --> 00:02:21,214 ->> Okay, good. - |