質問編集履歴
1
コードの一部のミスを修正
test
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File without changes
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test
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@@ -36,7 +36,7 @@
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36
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def by_categories
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-
post_ids = Category.where(id: [1,2,3]).map{ |c| c.posts.ids }
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+
post_ids = Category.where(id: [1,2,3]).map{ |c| c.posts.ids }.flatten
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@posts = Post.where(id: post_ids).order(created_at: :desc)
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