投稿時間:2021-09-26 09:19:34 RSSフィード2021-09-26 09:00 分まとめ(20件)

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IT	ITmedia 総合記事一覧	[ITmedia News] Netflixの実写版「カウボーイビバップ」、OP動画公開	https://www.itmedia.co.jp/news/articles/2109/26/news024.html	itmedianewsnetflix	2021-09-26 08:03:00
python	Pythonタグが付けられた新着投稿 - Qiita	インフルエンサー炎上に学ぶ、YouTube視聴者行動の分析	https://qiita.com/c60evaporator/items/bf9d5ad2d13876a670cf	登録者数・再生回数共に、炎上したインフルエンサーは減少、炎上参加者批評者は増加する炎上参加者は、炎上関係の批評動画アップロード数が多いほど、登録者数・再生回数が増加する複数の事例を分析しても、基本的に炎上したインフルエンサーは登録者数・再生回数共に落ちている炎上で再生回数が大きく増えたインフルエンサーは、炎上後に休止状態に入っていた結論炎上が起こる原因として、「社会正義に対する義憤」正の感情、「成功者への嫉妬心」負の感情という、感情的な側面が挙げられることが多いです。	2021-09-26 08:28:28
python	Pythonタグが付けられた新着投稿 - Qiita	AWSでAIサービスを使ってみる〜第12回personalize編その②〜	https://qiita.com/AInosukey/items/4215a0030b054609afc8	createbucketメソッドでsバケットを作成します。	2021-09-26 08:15:14
Program	[全てのタグ]の新着質問一覧｜teratail（テラテイル）	ソースファイルに定義されたグローバル変数は必ず共有されるか	https://teratail.com/questions/361335?rss=all		2021-09-26 09:00:13
AWS	AWSタグが付けられた新着投稿 - Qiita	AWSでAIサービスを使ってみる〜第12回personalize編その②〜	https://qiita.com/AInosukey/items/4215a0030b054609afc8	createbucketメソッドでsバケットを作成します。	2021-09-26 08:15:14
海外TECH	DEV Community	Models' Relationship In Django	https://dev.to/manarabdelkarim/models-relationship-in-django-1c93	Models x Relationship In DjangoHello BackEnders Back on days on the final Project day before graduation I was asked about the difference between Foreignkey and OneToOne fields in Django s models That was because I mistakenly used OneToOne instead of Foreignkey It was a bad and humiliating situation that I can t forget Anyway I decided today to explain OneToOne ManyToMany and Foreignkey in Django So let s get started Why do we use relationships The first step to understand the relationships is to understand why we need them Let s not talk too much about the concept of Normalization imagine if we have a table with students names gender and school events StudentIDStudentNameStudentGenderStudentsClassStudentDeskSchoolEventsNatchosMaleAZoo Visit Charity DayManarFemaleACharity DayKareemMaleAZoo Visits Math Competitionyou can notice here that every student has a desk represented with a number but why do we have this data in this table Also Male in StudentGender and A in StudentsClass has been repeated twice in the table And the worst is in the SchoolEvents column Just think if we want to delete the Zoo Visit from Natchos s ongoing events the Charity Day will be deleted too Imagine if we have or students Instead we have to divide the table into smaller tables four tables in our case StudentIDStudentNameNatchosManarKareemIDStudentGenderMaleFemaleIDStudentsClassAAIDEventsZoo VisitCharity DayMath CompetitionPerfect But what is next We need a way a link to tell the database that this particular student is in this class has this gender and will go to these events That is what we do with relationships A relationship is an association between two entities Foreignkey I started with Foreignkey because it is the easiest to understand Foreignkey in Django represents one to many also called many to one relationship in the database it is just the same as its name one to many I have one mother and my mother has many children The country has many cities and every city is located in one country In our example above every student normally should have one gender and every gender is for many students Natchos and Kareem are two students many Male is one Represent Foreignkey in Django Because we can not represent all the many in the one table It makes a lot of sense to represent the repationship from the many sides which means in our example we can t go to the Gender table add a row and say in it we have a relationship with Natchos and Kareem and John and Tom etc in the male row record instead we can add a row in the student row and called gender that says these students a relationship with the Gender table in Male or in Female Now to represent the ForeignKey will add it in the Student Field with one main parameter referring to the model that has ForeignKey relationship many to one with it from django db import modelsclass StudentGender models Model gender models CharField max length class Student models Model name models CharField max length gender models ForeignKey StudentGender null True Notice in class Student gender models ForeignKey Gender on delete models CASCADE That in Django we don t refer to the id of the other model but for the model class itself in other frameworks such as Flask we refer to the other model s id Also we used null True to allow the nulls so we can have some students with no gender specified OneToOneone to one is as easy as you can think this pen is mine and this pen has one owner I have one husband and my husband has one wife In our example every student setting on one desk and every desk is for one student at least in my country Represent OneToOne in Django At this point and because we are going to add one value in either table it doesn t matter where we add it But because I think that it is a good idea to add in the Chair table since that the student is the main character I will add the OneToOne field to the Chair class StudentGender models Model gender models CharField max length Student models OneToOneField Student null True class Student models Model name models CharField max length gender models ForeignKey StudentGender null True Notice in class Student gender models ForeignKey StudentGender null True Notice that here I also used null True because as you know if a chair has no student to set on we don t have to throw it from the window ManyToManyStudents enroll in many courses and every course is enrolled by many students in our example each student can attend many events and every event will be attended by many students This is simply what a many to many relationships is Represent ManyToMany in Django In ForeignKey we chose the one table and in OneToOne we chose either one so what table can we choose in many to many In the normal cases we create a third table more like a third wheel in the relationship that has the id of the first table and the id of the second table as below But But But Django made it easier for us it is just as easy as adding ManyToOne or foreignKey Again I will not choose the student class Student models Model name models CharField max length gender models ForeignKey StudentGender null True class Chair models Model chair number models IntegerField student models ManyToManyField student Here It seems we have reached the end Happy day to you and happy birthday to ME References Django Models with Relationships ーOne to One RelationshipModel field reference¶	2021-09-25 23:26:16
海外TECH	DEV Community	Do you need a State Management Library?	https://dev.to/link2twenty/do-you-need-a-state-management-library-29o6	Do you need a State Management Library The other day I was browsing LinkedIn when a poll caught my eyeWhat s your favourite React State Management Library and why Naturally I felt there was an option missing from the poll and left a comment I replied saying I felt a custom hook with the context API should be enough let s talk about that What is a State Management Library Before we look at what state management is we have to agree on what state is State is a place in memory where we can store some data anything really For instance with a checkbox it is either checked or not true or false and they are its states storing a user s name as a string is a state or an array of preferences the list is endless So what is state management These states variables need to be interacted with some how Be it reading the value or setting it In it s most simple form state management is how you interact with a variable In React states are easy provided you only want to touch them inside the components they were made in State Management Library s for React make it possible to interact with states from anywhere without having to prop drill This is great and it why these libraries are so popular but is there a better way What is the context API The context API is a default React hook used to allow data objects functions strings etc to be accessed by any child component When we use this API in tandem with a custom hook it gets a lot more powerful We can pass objects with getter and setter functions that can be used read or modify states as you d expect or have functions that allow us to set several states at once or even give us data back in certain formats perhaps for API calls How can we use the context API Here I ve written a very simple hook to manage storing a person s name It stores a first and last name which you can both get and set it also concatenates the two names into one long name that can be read from context this is not something you d ever really need to do but it shows how data can be returned formatted there is also a function that lets you set both states at once Have a look through the code as I said it s nothing complex but it was only meant to serve as an example of what can be done rather than a template to be followed Final thoughtsWith all of this power built into React do we need State Management Libraries Maybe we do or maybe we don t but either way please let me know if you use one and if you do why I look forward to reading your comments Thank you so much for reading	2021-09-25 23:23:55
ニュース	BBC News - Home	TV channels go off air after fire alarm	https://www.bbc.co.uk/news/entertainment-arts-58694894?at_medium=RSS&at_campaign=KARANGA	broadcast	2021-09-25 23:15:35
ニュース	BBC News - Home	German elections: Voters decide who will take charge after Merkel	https://www.bbc.co.uk/news/world-europe-58690645?at_medium=RSS&at_campaign=KARANGA	europe	2021-09-25 23:02:38
ニュース	BBC News - Home	Ryder Cup: United States open 11-5 lead over Europe at Whistling Straits	https://www.bbc.co.uk/sport/golf/58692075?at_medium=RSS&at_campaign=KARANGA	Ryder Cup United States open lead over Europe at Whistling StraitsThe United States look set to regain the Ryder Cup after another dominating display on day two at Whistling Straits sees them open a six shot lead over Europe	2021-09-25 23:41:42
ニュース	BBC News - Home	Young more likely to pray than over-55s - survey	https://www.bbc.co.uk/news/uk-58681075?at_medium=RSS&at_campaign=KARANGA	suggests	2021-09-25 23:54:25
ニュース	BBC News - Home	Rwanda genocide 'kingpin' Théoneste Bagosora dies in prison	https://www.bbc.co.uk/news/world-africa-58695094?at_medium=RSS&at_campaign=KARANGA	sentence	2021-09-25 23:26:30
ニュース	BBC News - Home	'Why didn't he have a go?' Pundits bemused by 'negative', 'gun-shy' Joshua	https://www.bbc.co.uk/sport/boxing/58694985?at_medium=RSS&at_campaign=KARANGA	x Why didn x t he have a go x Pundits bemused by x negative x x gun shy x JoshuaFormer British heavyweight champion Dillian Whyte says compatriot Anthony Joshua was gun shy as he lost his world titles to Oleksandr Usyk	2021-09-25 23:45:49
ニュース	BBC News - Home	Ryder Cup: Lowry, Johnson & Garcia feature in best shots from day two	https://www.bbc.co.uk/sport/av/golf/58695324?at_medium=RSS&at_campaign=KARANGA	Ryder Cup Lowry Johnson amp Garcia feature in best shots from day twoShane Lowry Dustin Johnson and Sergio Garcia all feature in the best shots of the foursomes and fourballs on the second day of the Ryder Cup	2021-09-25 23:18:21
LifeHuck	ライフハッカー［日本版］	心理学者が発見した「良い人生」を送るための3つの道筋	https://www.lifehacker.jp/2021/09/psychological-richness-happiness-satisfaction.html	kahneman	2021-09-26 08:30:00
北海道	北海道新聞	パイレーツ筒香は３打数１安打　フィリーズ戦	https://www.hokkaido-np.co.jp/article/593109/	筒香	2021-09-26 08:19:00
北海道	北海道新聞	牛カルビにサケの切り身、ケーキまで　変わり種自販機　札幌に続々	https://www.hokkaido-np.co.jp/article/593025/	変わり種	2021-09-26 08:10:13
北海道	北海道新聞	鎌田大地、後半途中から出場　ドイツ１部	https://www.hokkaido-np.co.jp/article/593103/	鎌田大地	2021-09-26 08:08:00
北海道	北海道新聞	負傷の久保建、Ｗ杯予選招集せず　森保監督「焦らず治して」	https://www.hokkaido-np.co.jp/article/593102/	監督	2021-09-26 08:08:00
海外TECH	reddit	[Postgame Thread] NC State Defeats Clemson 27-21 (2OT)	https://www.reddit.com/r/CFB/comments/pvhxzh/postgame_thread_nc_state_defeats_clemson_2721_2ot/	Postgame Thread NC State Defeats Clemson OT Box Score provided by ESPN Team OT T Clemson NC State Made with the r CFB Game Thread Generator submitted by u JMT to r CFB link comments	2021-09-25 23:24:06