{"id":26055,"date":"2016-12-07T10:07:51","date_gmt":"2016-12-07T10:07:51","guid":{"rendered":"https:\/\/dev.railscarma.com\/use-belongs_to-ruby-rails\/"},"modified":"2021-05-27T06:17:10","modified_gmt":"2021-05-27T06:17:10","slug":"ruby-rails%e3%81%ab%e6%89%80%e5%b1%9e%e3%81%99%e3%82%8b%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/%e6%8a%80%e8%a1%93%e8%ab%96%e6%96%87\/ruby-rails%e3%81%ab%e6%89%80%e5%b1%9e%e3%81%99%e3%82%8b%e3%80%82\/","title":{"rendered":"Ruby on Rails\u3067belongs_to\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"<p><strong>\u30ec\u30fc\u30eb 4:<\/strong><br \/>\nMovie \u3068 Actor \u3068\u3044\u3046 2 \u3064\u306e\u30e2\u30c7\u30eb\u304c\u3042\u308b\u3068\u4eee\u5b9a\u3057\u307e\u3057\u3087\u3046\u3002 Actor \u306b\u306f\u591a\u304f\u306e\u6620\u753b\u304c\u3042\u308a\u3001Movie \u306f Actor \u306b\u5c5e\u3057\u307e\u3059\u3002\u307b\u3068\u3093\u3069\u306e\u5834\u5408\u3001\u958b\u767a\u8005\u306f\u5916\u90e8\u30ad\u30fc Actor_id \u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u5165\u529b\u3055\u308c\u305f\u30a2\u30af\u30bf\u30fc ID \u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u306b\u95a2\u3057\u3066\u30a2\u30af\u30bf\u30fc \u30e2\u30c7\u30eb\u306f\u691c\u8a3c\u3055\u308c\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u3001\u30d5\u30a9\u30fc\u30e0\u3092\u9001\u4fe1\u3059\u308b\u3068\u304d\u306b\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u7a7a\u3067\u306f\u306a\u3044\u3053\u3068\u3092\u5e38\u306b\u691c\u8a3c\u3059\u308b\u5c5e\u6027\u691c\u8a3c\u306b\u4f3c\u3066\u3044\u307e\u3059\u3002<\/p>\n<p><strong>\u5916\u90e8\u30ad\u30fc\u306b\u3088\u308b\u691c\u8a3c:<\/strong><\/p>\n<pre><code>class Movie &lt; ApplicationRecord \u306e\u6240\u5c5e\u5148 :actor \u691c\u8a3c :actor_id\u3001\u5b58\u5728: true end<\/code><\/pre>\n<pre><code>class Actor &lt; ApplicationRecord has_many :movies\u3001\u4f9d\u5b58: :destroy end<\/code><\/pre>\n<p>\u4e0a\u8a18\u306e\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u3001\u901a\u5e38\u306e\u5c5e\u6027\u306e\u5b58\u5728\u30d0\u30ea\u30c7\u30fc\u30bf\u3068\u306f\u7570\u306a\u308a\u3001\u30a2\u30af\u30bf\u30fc ID \u306e\u5b58\u5728\u3092\u691c\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<pre><code>\u4f8b: Actor.create(\u30bf\u30a4\u30c8\u30eb: \u201cabc\u201d) =&gt; {id: 1, title: &#039;abc&#039;} m = Movie.new(title: \u201cok ok\u201d, actress_id: 111) =&gt; m.valid? =&gt; true =&gt; Actor.find(111) ActiveRecord::RecordNotFound: &#039;id&#039;=111 \u306e\u30a2\u30af\u30bf\u30fc\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f<\/code><\/pre>\n<p>\u6709\u52b9\u306a\u4ff3\u512a\u304c\u306a\u304f\u3066\u3082\u30e0\u30fc\u30d3\u30fc \u30ec\u30b3\u30fc\u30c9\u3092\u4fdd\u5b58\u3067\u304d\u307e\u3059\u3002<\/p>\n<p><strong>\u5354\u4f1a\u3042\u308a<\/strong><\/p>\n<pre><code>class Movie &lt; ApplicationRecord \u306e\u6240\u5c5e\u5148 :actor \u3092\u691c\u8a3c\u3057\u307e\u3059:actor\u3001\u5b58\u5728: true end<\/code><\/pre>\n<p><strong>\uff08\u307e\u305f\u306f\uff09<\/strong><\/p>\n<pre><code>class Movie &lt; ApplicationRecord \u306e\u6240\u5c5e\u5148:actor\u3001\u5fc5\u9808: true end<\/code><\/pre>\n<pre><code>class Actor &lt; ApplicationRecord has_many :movies\u3001\u4f9d\u5b58: :destroy end<\/code><\/pre>\n<pre><code>\u4f8b: Actor.create(\u30bf\u30a4\u30c8\u30eb: \u201cabc\u201d) ==&gt; {id: 1, title: &#039;abc&#039;} m = Movie.new(title: \u201cok ok\u201d, actress_id: 111) ==&gt; m.valid? =&gt; false ==&gt; m.errors.full_messages, [&#039;\u30a2\u30af\u30bf\u30fc\u3092\u7a7a\u767d\u306b\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093&#039;]<\/code><\/pre>\n<p>\u3053\u306e\u5834\u5408\u3001\u5165\u529b\u3055\u308c\u305f\u30a2\u30af\u30bf\u30fc\u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u304c\u5e38\u306b\u691c\u8a3c\u3055\u308c\u307e\u3059\u3002\u7121\u52b9\u306a\u30a2\u30af\u30bf\u30fc\u306e\u5834\u5408\u306f\u3001\u30a8\u30e9\u30fc\u304c\u30b9\u30ed\u30fc\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u95a2\u9023\u4ed8\u3051\u3092\u884c\u3046\u305f\u3081\u306e\u30d9\u30b9\u30c8 \u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3067\u3059\u3002\u95a2\u9023\u4ed8\u3051\u3089\u308c\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u5e38\u306b\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002<br \/>\n<strong><br \/>\n\u30ec\u30fc\u30eb5<\/strong><br \/>\nRails5 \u304b\u3089\u3001\u3053\u308c\u3089\u306e\u691c\u8a3c\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u3001belongs_to \u95a2\u9023\u4ed8\u3051\u3092\u5b9a\u7fa9\u3059\u308b\u3068\u304d\u306b\u95a2\u9023\u4ed8\u3051\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5b58\u5728\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3053\u3068\u3092\u691c\u8a3c\u3057\u307e\u3059\u3002<br \/>\n<strong><br \/>\n\u30ea\u30ea\u30fc\u30b9\u30ce\u30fc\u30c8<\/strong><br \/>\nhttp:\/\/guides.rubyonrails.org\/5_0_release_notes.html(\u95a2\u9023\u4ed8\u3051\u304c\u5b58\u5728\u3057\u306a\u3044\u5834\u5408\u3001belongs_to \u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u691c\u8a3c\u30a8\u30e9\u30fc\u3092\u30c8\u30ea\u30ac\u30fc\u3059\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002)<\/p>\n<p>\u521d\u671f\u5316\u30d5\u30a1\u30a4\u30eb\u3067\u69cb\u6210\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304b\u3089\u3053\u306e\u6a5f\u80fd\u3092\u5b8c\u5168\u306b\u30aa\u30d7\u30c8\u30a2\u30a6\u30c8\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code>config\/initializers\/new_framework_defaults.rb<\/code><\/pre>\n<pre><code>Rails.application.config.active_record.belongs_to_required_by_default = false<\/code><\/pre>\n<p>\u3053\u306e\u521d\u671f\u5316\u30d5\u30a1\u30a4\u30eb\u306f\u3001rails5 \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u306e\u307f\u5b58\u5728\u3057\u307e\u3059\u3002 Rails \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u53e4\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u304b\u3089\u79fb\u884c\u3057\u3001\u5fc5\u8981\u306a\u5909\u66f4\u3092\u52a0\u3048\u308b\u5834\u5408\u306f\u3001\u3053\u306e\u521d\u671f\u5316\u30d5\u30a1\u30a4\u30eb\u3092\u624b\u52d5\u3067\u8ffd\u52a0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre><code>class Post &lt; ApplicationRecord has_many :comments\u3001\u4f9d\u5b58: :destroy end<\/code><\/pre>\n<pre><code>class Comment &lt; ApplicationRecord \u306e\u6240\u5c5e\u5148 :post end<\/code><\/pre>\n<pre><code>c = Comment.create(title: \u201c\u7d20\u6674\u3089\u3057\u3044\u6295\u7a3f\u201d) c.errors.full_messages.to_sentence =&gt; \u201c\u6295\u7a3f\u306f\u5b58\u5728\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u201d<\/code><\/pre>\n<p>\u95a2\u9023\u3059\u308b\u30ec\u30b3\u30fc\u30c9\u304c\u306a\u3051\u308c\u3070\u30b3\u30e1\u30f3\u30c8 \u30ec\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002<\/p>\n<p>\u8a2d\u5b9a\u3059\u308b\u3053\u3068\u3067\u3001\u3053\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u52d5\u4f5c\u3092\u30aa\u30d7\u30c8\u30a2\u30a6\u30c8\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre><code>\u6240\u5c5e\u5148:post\u3001\u30aa\u30d7\u30b7\u30e7\u30f3: true<\/code><\/pre>\n<pre><code>c = Comment.create(\u30bf\u30a4\u30c8\u30eb: \u201c\u7d20\u6674\u3089\u3057\u3044\u6295\u7a3f\u201d)<\/code><\/pre>\n<pre><code>=&gt; <\/code><\/pre>\n<p>RailsCarma \u304c\u63d0\u4f9b\u3057\u3066\u3044\u308b <a href=\"https:\/\/www.railscarma.com\/ja\/\" target=\"_blank\" rel=\"noopener noreferrer\">Ruby on Rails\u958b\u767a\u30b5\u30fc\u30d3\u30b9<\/a>\u00a0\u904e\u53bb8\u5e74\u9593\u4ee5\u4e0a\u3002\u5f53\u793e\u306e\u958b\u767a\u8005\u306f\u3001\u3042\u3089\u3086\u308b\u7a2e\u985e\u306e\u5b9f\u884c\u306b\u7cbe\u901a\u3057\u3066\u3044\u307e\u3059\u3002 <a href=\"https:\/\/www.railscarma.com\/ja\/\" target=\"_blank\" rel=\"noopener noreferrer\">Ruby on Rails \u306e Web \u958b\u767a<\/a> \u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u69cb\u7bc9\u3057\u3001\u65e2\u5b58\u306e Rails \u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u6a5f\u80fd\u3092\u5f37\u5316\u3057\u307e\u3059\u3002\u5f53\u793e\u306e\u958b\u767a\u30b9\u30ad\u30eb\u3084\u3053\u308c\u307e\u3067\u306b\u53d6\u308a\u7d44\u3093\u3067\u304d\u305f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u77e5\u308a\u305f\u3044\u5834\u5408\u306f\u3001\u304a\u554f\u3044\u5408\u308f\u305b\u304f\u3060\u3055\u3044\u3002<\/p>\n  <div class=\"related-post slider\">\r\n        <div class=\"headline\">\u95a2\u9023\u8a18\u4e8b<\/div>\r\n    <div class=\"post-list owl-carousel\">\r\n\r\n            <div class=\"item\">\r\n            <div class=\"thumb post_thumb\">\r\n    <a  title=\"\u30ab\u30df\u30ca\u30ea\u30b8\u30a7\u30e0\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/%e6%8a%80%e8%a1%93%e8%ab%96%e6%96%87\/%e3%82%ab%e3%83%9f%e3%83%8a%e3%83%aa%e3%82%b8%e3%82%a7%e3%83%a0\/?related_post_from=37277\">\r\n\r\n      <img decoding=\"async\" width=\"800\" height=\"300\" src=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2023\/04\/kaminari-gem.jpg\" class=\"attachment-full size-full wp-post-image\" alt=\"\u30ab\u30df\u30ca\u30ea\u30b8\u30a7\u30e0\" srcset=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2023\/04\/kaminari-gem.jpg 800w, https:\/\/www.railscarma.com\/wp-content\/uploads\/2023\/04\/kaminari-gem-300x113.jpg 300w, https:\/\/www.railscarma.com\/wp-content\/uploads\/2023\/04\/kaminari-gem-768x288.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\r\n\r\n    <\/a>\r\n  <\/div>\r\n\r\n  <a class=\"title post_title\"  title=\"\u30ab\u30df\u30ca\u30ea\u30b8\u30a7\u30e0\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/%e6%8a%80%e8%a1%93%e8%ab%96%e6%96%87\/%e3%82%ab%e3%83%9f%e3%83%8a%e3%83%aa%e3%82%b8%e3%82%a7%e3%83%a0\/?related_post_from=37277\">\r\n        \u30ab\u30df\u30ca\u30ea\u30b8\u30a7\u30e0  <\/a>\r\n\r\n        <\/div>\r\n              <div class=\"item\">\r\n            <div class=\"thumb post_thumb\">\r\n    <a  title=\"\u306a\u305c2026\u5e74\u306bRuby on Rails\u958b\u767a\u8005\u3092\u96c7\u3046\u306e\u304b\uff1f\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/%e3%83%ad%e3%83%bc\/why-to-hire-ruby-on-rails-developers\/?related_post_from=30627\">\r\n\r\n      <img decoding=\"async\" width=\"800\" height=\"300\" src=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2019\/01\/why-to-hire-ruby-on-rails-developers-in-2022.jpg\" class=\"attachment-full size-full wp-post-image\" alt=\"2022 \u5e74\u306b Ruby on Rails \u958b\u767a\u8005\u3092\u96c7\u7528\u3059\u308b\u7406\u7531\" srcset=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2019\/01\/why-to-hire-ruby-on-rails-developers-in-2022.jpg 800w, https:\/\/www.railscarma.com\/wp-content\/uploads\/2019\/01\/why-to-hire-ruby-on-rails-developers-in-2022-300x113.jpg 300w, https:\/\/www.railscarma.com\/wp-content\/uploads\/2019\/01\/why-to-hire-ruby-on-rails-developers-in-2022-768x288.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\r\n\r\n    <\/a>\r\n  <\/div>\r\n\r\n  <a class=\"title post_title\"  title=\"\u306a\u305c2026\u5e74\u306bRuby on Rails\u958b\u767a\u8005\u3092\u96c7\u3046\u306e\u304b\uff1f\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/%e3%83%ad%e3%83%bc\/why-to-hire-ruby-on-rails-developers\/?related_post_from=30627\">\r\n        \u306a\u305c2026\u5e74\u306bRuby on Rails\u958b\u767a\u8005\u3092\u96c7\u3046\u306e\u304b\uff1f  <\/a>\r\n\r\n        <\/div>\r\n              <div class=\"item\">\r\n            <div class=\"thumb post_thumb\">\r\n    <a  title=\"\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba \u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u958b\u767a\u306b\u304a\u3051\u308b\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2 \u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u91cd\u8981\u6027\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/%e3%83%ad%e3%83%bc\/%e3%82%a8%e3%83%b3%e3%82%bf%e3%83%bc%e3%83%97%e3%83%a9%e3%82%a4%e3%82%ba%e3%83%bb%e3%82%bd%e3%83%95%e3%83%88%e3%82%a6%e3%82%a7%e3%82%a2%e9%96%8b%e7%99%ba%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%82%bd\/?related_post_from=36250\">\r\n\r\n      <img decoding=\"async\" width=\"800\" height=\"300\" src=\"https:\/\/www.railscarma.com\/wp-content\/uploads\/2022\/06\/Importance-of-Software-Architecture-in-enterprise-software-development.jpg\" class=\"attachment-full size-full wp-post-image\" alt=\"\u30a8\u30f3\u30bf\u30fc\u30d7\u30e9\u30a4\u30ba \u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u958b\u767a\u306b\u304a\u3051\u308b\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2 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\u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u3092\u691c\u8a3c\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u5834\u5408\u3001\u5165\u529b\u3055\u308c\u305f\u30a2\u30af\u30bf\u30fc ID \u304c\u5b58\u5728\u3059\u308b\u304b\u3069\u3046\u304b\u306b\u95a2\u3057\u3066\u30a2\u30af\u30bf\u30fc \u30e2\u30c7\u30eb\u306f\u691c\u8a3c\u3055\u308c\u307e\u305b\u3093\u3002\u3053\u308c\u306f\u3001\u30d5\u30a9\u30fc\u30e0\u3092\u9001\u4fe1\u3059\u308b\u3068\u304d\u306b\u30d5\u30a3\u30fc\u30eb\u30c9\u304c\u7a7a\u3067\u306f\u306a\u3044\u3053\u3068\u3092\u5e38\u306b\u691c\u8a3c\u3059\u308b\u5c5e\u6027\u691c\u8a3c\u306b\u4f3c\u3066\u3044\u307e\u3059\u3002\u5916\u90e8\u30ad\u30fc\u306b\u3088\u308b\u691c\u8a3c: class Movie &lt; ApplicationRecordowned_to :actor validates :actor_id, present: true end class Actor &lt; ApplicationRecord has_many :movies,dependent: :destroy end \u4e0a\u8a18\u306e\u30b7\u30ca\u30ea\u30aa\u3067\u306f\u3001\u30a2\u30af\u30bf\u30fc ID \u306e\u6709\u7121\u3092\u691c\u8a3c\u3057\u307e\u3059\u3002<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/ruby-regex-match-guide-with-examples\/\"> <span class=\"screen-reader-text\">Ruby\u6b63\u898f\u8868\u73fe\u30de\u30c3\u30c1\u30ac\u30a4\u30c9\uff082026\uff09\u4f8b\u4ed8\u304d<\/span> \u3082\u3063\u3068\u8aad\u3080 \"<\/a><\/p>","protected":false},"author":1,"featured_media":31824,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[384],"tags":[],"class_list":["post-26055","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technical-articles"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to use belongs_to in Ruby on Rails - RailsCarma - Ruby on Rails Development Company specializing in Offshore 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