投稿時間:2023-04-13 18:18:37 RSSフィード2023-04-13 18:00 分まとめ(24件)

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IT	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] バーミヤン、グランドメニュー改定　ワンコイン晩酌セットも　特徴は？	https://www.itmedia.co.jp/business/articles/2304/13/news166.html	itmedia	2023-04-13 17:40:00
IT	ITmedia 総合記事一覧	[ITmedia ビジネスオンライン] バーガーキング、バーガー単品2個で500円の「2コ得」キャンペーン　顧客満足度向上を見込む	https://www.itmedia.co.jp/business/articles/2304/13/news169.html	itmedia	2023-04-13 17:13:00
TECH	Techable（テッカブル）	「パーパス・ドリブン、ビジョン・ドリブンな企業」に適する幹部人材の6つの条件／追跡！エグゼクティブ採用のいま＆これから【第六回】	https://techable.jp/archives/203093	井上和幸	2023-04-13 08:30:16
python	Pythonタグが付けられた新着投稿 - Qiita	python maya move cam to the top of the DAG (Directed Acyclic Graph) hierarchy	https://qiita.com/aizwellenstan/items/fb4f94502b440b32a66e	camera	2023-04-13 17:50:29
python	Pythonタグが付けられた新着投稿 - Qiita	初心者がStreamlitでマテリアルズインフォマティクスのWebアプリを作ってみた	https://qiita.com/seshiu/items/25e303bd18682f8fc4fd	stream	2023-04-13 17:47:59
Program	CodeZine	rexcornu、ITエンジニア調達支援サービス「TechMatch」の提供を開始	http://codezine.jp/article/detail/17659	rexcornu	2023-04-13 17:20:00
Program	CodeZine	Google、階層型ファイアウォールポリシーとネットワークファイアウォールポリシーをサポートするファイアウォールインサイトを一般提供	http://codezine.jp/article/detail/17660	google	2023-04-13 17:20:00
AWS	AWSタグが付けられた新着投稿 - Qiita	AWS - ECS のコンテナに ECS Exec で接続する例	https://qiita.com/YumaInaura/items/91f363a14b3eeae6ed1c	awscli	2023-04-13 17:56:49
AWS	AWSタグが付けられた新着投稿 - Qiita	AWS 基本ネットワーク構成(VPCやらサブネットやら)	https://qiita.com/TeihenEngineer/items/92b5377246af8837db64	解説	2023-04-13 17:38:06
技術ブログ	Hatena::Engineering	Hatena Engineer Seminar #24「はてなインターン完全攻略マニュアル」を5月9日にオンライン開催します #hatenatech	https://developer.hatenastaff.com/entry/engineer-seminar-24	HatenaEngineerSeminar「はてなインターン完全攻略マニュアル」を月日にオンライン開催しますhatenatech年月日火にHatenaEngineerSeminar「はてなインターン完全攻略マニュアル」を開催します。	2023-04-13 18:00:00
海外TECH	DEV Community	Active Record "merge"	https://dev.to/daviducolo/active-record-merge-3049	Active Record quot merge quot Active Record is a part of the Ruby on Rails framework that provides an easy to use interface to interact with databases One of the most powerful and commonly used methods in Active Record is the merge method The merge method allows you to combine two Active Record relations together and return a new relation that contains the records from both relations In this article we will explore the merge method in detail and provide examples of how it can be used What is the merge method The merge method is used to combine two Active Record relations into a single relation The resulting relation will contain records that exist in both of the original relations In other words the merge method performs an SQL join on the two relations relation merge other relation Here relation and other relation are two Active Record relations that you want to merge together ExamplesLet s take a look at some examples of using the merge method in different scenarios Example Merging two relations based on a common attributeSuppose you have two Active Record relations posts and comments Each post has many comments You want to find all posts that have at least one comment posts with comments Post joins comments merge Comment all In this example we first join the posts relation with the comments table using the joins method Then we merge the resulting relation with the Comment all relation using the merge method The resulting relation contains all posts that have at least one comment Example Merging two relations with conditionsSuppose you have two Active Record relations posts and comments Each post has many comments You want to find all posts that have at least one comment with the word Rails in it posts with rails comments Post joins comments merge Comment where body LIKE Rails In this example we first join the posts relation with the comments table using the joins method Then we merge the resulting relation with the Comment where body LIKE Rails relation using the merge method The resulting relation contains all posts that have at least one comment with the word Rails in it Example Merging two relations with different orderingsSuppose you have two Active Record relations posts and comments Each post has many comments You want to find all posts that have at least one comment sorted by the number of comments in descending order posts with comments ordered Post joins comments merge Comment all order COUNT comments id DESC group posts id In this example we first join the posts relation with the comments table using the joins method Then we merge the resulting relation with the Comment all relation using the merge method We then sort the resulting relation by the number of comments in descending order using the order method and group by the post ID using the group method PerformanceWhen it comes to the performance of the merge method compared to other methods it s important to note that the performance can vary depending on the specific use case and data involved However in general the merge method can offer better performance than other methods such as includes or joins The includes method is used to eager load associations which can help to reduce the number of database queries when accessing the associated data However includes does not perform any joins and can result in additional queries being executed when accessing the associated data This can lead to performance issues when dealing with large datasets On the other hand the joins method is used to perform SQL joins between tables which can help to reduce the number of database queries and improve performance However joins can be more difficult to use than merge and can result in more complex SQL queries being generated The merge method as discussed earlier combines the benefits of both includes and joins by allowing you to merge two relations together and perform SQL joins on them This can lead to a reduction in the number of queries executed while also providing greater flexibility than includes or joins Another benefit of the merge method is that it allows for lazy loading of associations which can improve performance by only loading the associated data when it is actually needed This can help to reduce the memory usage of your application and improve overall performance In conclusion while the performance of the merge method compared to other methods can depend on the specific use case it can offer better performance than includes or joins in many scenarios The merge method combines the benefits of both includes and joins while also providing greater flexibility and lazy loading of associations require benchmark require active record Set up a connection to a SQLite databaseActiveRecord Base establish connection adapter sqlite database memory Define two models with a belongs to associationclass Author lt ActiveRecord Base has many booksendclass Book lt ActiveRecord Base belongs to authorend Create some test dataauthors times do i author Author create name Author i times do j author books create title Book j end authors lt lt authorend Test the performance of the merge methodputs Testing merge method time Benchmark measure do relation Author where name Author includes books relation Author where name Author includes books relation relation merge relation relation to aendputs Time elapsed time real Test the performance of the includes methodputs Testing includes method time Benchmark measure do relation Author where name Author includes books relation Author where name Author includes books relation relation relation relation to aendputs Time elapsed time real Test the performance of the joins methodputs Testing joins method time Benchmark measure do relation Author joins books where name Author relation Author joins books where name Author relation relation relation relation to aendputs Time elapsed time real This code creates two models Author and Book with a belongs to association between them It then creates authors each with books The code then tests the performance of the merge includes and joins methods by fetching two relations and merging them together and then measuring the time elapsed The merge method is tested first followed by the includes method and then the joins method Here are the results of running this code on my machine Testing merge method Time elapsed Testing includes method Time elapsed Testing joins method Time elapsed As you can see the merge method was the fastest with a time elapsed of seconds The joins method was the second fastest with a time elapsed of seconds The includes method was the slowest with a time elapsed of seconds These results demonstrate that the merge method can offer better performance than the includes method in certain scenarios and that the joins method can also be fast but is less flexible However it s important to note that the performance of these methods can vary depending on the specific use case and data involved so it s always a good idea to test the performance of your code in your specific environment to determine which method is best suited to your needs ConclusionIn summary the merge method is a powerful tool in the Active Record arsenal that allows developers to easily combine multiple relationships and extract data from them It can be used to perform SQL joins apply conditions and sort and group the results The examples provided demonstrate the versatility of the merge method and how it can be used in various scenarios By using the merge method effectively developers can write cleaner and more efficient code making Active Record an even more powerful tool for working with databases in the Ruby on Rails framework	2023-04-13 08:15:44
海外科学	NYT > Science	Appeals Court Says Abortion Pill Can Remain Available but Imposes Temporary Restrictions	https://www.nytimes.com/2023/04/13/health/abortion-pill-ruling-appeal.html	Appeals Court Says Abortion Pill Can Remain Available but Imposes Temporary RestrictionsThe judges blocked the drug from being sent to patients through the mail and rolled back other steps the government had taken to ease access	2023-04-13 08:12:57
医療系	医療介護 CBnews	東京のインフルエンザ患者報告数が4週連続減-第14週、31保健所管内のうち24管内で減少	https://www.cbnews.jp/news/entry/20230413171147	都内	2023-04-13 17:30:00
医療系	医療介護 CBnews	看護職員のコロナ関連欠勤者数が減少-厚労省が重点医療機関の集計更新	https://www.cbnews.jp/news/entry/20230413170520	医療機関	2023-04-13 17:15:00
海外ニュース	Japan Times latest articles	Blinken to seek strategic upgrade of U.S.-Vietnam ties	https://www.japantimes.co.jp/news/2023/04/13/world/politics-diplomacy-world/blinken-upgrade-us-vietnam-ties/	Blinken to seek strategic upgrade of U S Vietnam tiesThe first official visit by the top U S envoy will focus on trade and investment supporting Vietnam s energy transition and response to climate change and	2023-04-13 17:00:36
ニュース	BBC News - Home	Renting: Shortfall of properties creates frenzied market, surveyors say	https://www.bbc.co.uk/news/business-65252376?at_medium=RSS&at_campaign=KARANGA	market	2023-04-13 08:33:04
ニュース	BBC News - Home	Strike action sees UK economy flatline in February	https://www.bbc.co.uk/news/business-65250170?at_medium=RSS&at_campaign=KARANGA	civil	2023-04-13 08:33:21
ニュース	BBC News - Home	More than £155k donated to sabotaged Harlow allotment	https://www.bbc.co.uk/news/uk-england-essex-65260582?at_medium=RSS&at_campaign=KARANGA	allotment	2023-04-13 08:08:18
ニュース	BBC News - Home	North Korea missile launch sparks confusion in Japan	https://www.bbc.co.uk/news/world-asia-65259718?at_medium=RSS&at_campaign=KARANGA	japanhokkaido	2023-04-13 08:24:49
ニュース	BBC News - Home	London Waterloo: South Western Railway tells passengers to avoid station	https://www.bbc.co.uk/news/uk-england-london-65260212?at_medium=RSS&at_campaign=KARANGA	railway	2023-04-13 08:15:26
ニュース	BBC News - Home	World Snooker Championship 2023: Reigning champion Ronnie O'Sullivan drawn against Pang Junxu in first round	https://www.bbc.co.uk/sport/snooker/65251924?at_medium=RSS&at_campaign=KARANGA	World Snooker Championship Reigning champion Ronnie O x Sullivan drawn against Pang Junxu in first roundDefending champion Ronnie O Sullivan will face debutant Pang Junxu in the first round of the World Championship	2023-04-13 08:46:27
ニュース	BBC News - Home	Frazer Clarke column: Briton Joe Joyce is third-best heavyweight in the world	https://www.bbc.co.uk/sport/boxing/65240147?at_medium=RSS&at_campaign=KARANGA	Frazer Clarke column Briton Joe Joyce is third best heavyweight in the worldIn his BBC Sport column Frazer Clarke says fellow Briton Joe Joyce is the third best heavyweight fighter in world boxing behind Tyson Fury and Oleksandr Usyk	2023-04-13 08:07:04
マーケティング	MarkeZine	サイバーエージェント、商品が自ら動き販促する「自己推薦ロボット」の効果の継続性における実証実験を開始	http://markezine.jp/article/detail/41958	実証実験	2023-04-13 17:15:00
マーケティング	AdverTimes	フジサンケイグループ広告大賞グランプリは、サントリー「素晴らしい過去になろう」	https://www.advertimes.com/20230413/article416226/	フジサンケイグループ広告大賞グランプリは、サントリー「素晴らしい過去になろう」月日に、「第回フジサンケイグループ広告大賞」の授賞式が東京・グランドプリンスホテル新高輪にて開催された。	2023-04-13 08:08:27