{"id":667,"date":"2022-08-30T15:05:10","date_gmt":"2022-08-30T15:05:10","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2013\/11\/09\/why-do-we-need-tonone-relationships-collection-of-common-programming-errors\/"},"modified":"2022-08-30T15:05:10","modified_gmt":"2022-08-30T15:05:10","slug":"why-do-we-need-tonone-relationships-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2022\/08\/30\/why-do-we-need-tonone-relationships-collection-of-common-programming-errors\/","title":{"rendered":"Why do we need *ToNone relationships-Collection of common programming errors"},"content":{"rendered":"<p>Why do we need *toNone relationship?<\/p>\n<p>If i not set inverse relations to Models f.e:<\/p>\n<pre><code>  App.Post = DS.Model.extend({\n    comments: DS.hasMany('App.Comment')\n  });\n\n  App.Comment = DS.Model.extend({\n    post: DS.belongsTo('App.Post')  \/\/ i dont want to set it\n  });\n<\/code><\/pre>\n<p>Ember data creates *ToNone relationshipChange, and in future when i delete the record (in our case it is instance of App.Comment) ember will delete all relationships connected with my record, including *ToNone relations with removeRelationshipChangeFor method.<\/p>\n<p>If i have ManyToOne relationship type inside removeRelationshipChangeFor i will get an error &#8220;Cannot read property &#8216;clientId&#8217; of undefined&#8221;. It happens because i dont have clientReference in ManyToNone relation.<\/p>\n<p>So what is the purpose of storing *ToNone relations?<\/p>\n<p id=\"rop\"><small>Originally posted 2013-11-09 21:20:38. <\/small><\/p>","protected":false},"excerpt":{"rendered":"<p>Why do we need *toNone relationship? If i not set inverse relations to Models f.e: App.Post = DS.Model.extend({ comments: DS.hasMany(&#8216;App.Comment&#8217;) }); App.Comment = DS.Model.extend({ post: DS.belongsTo(&#8216;App.Post&#8217;) \/\/ i dont want to set it }); Ember data creates *ToNone relationshipChange, and in future when i delete the record (in our case it is instance of App.Comment) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-667","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/667","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=667"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/667\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=667"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=667"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=667"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}