scope :search, ->(search_words) { return if search_words.empty? post_arel = Post.arel_table[:content] conditions = search_words.map { |word| post_arel.matches("%#{word}%") } where_clauses = conditions.inject do |arel_cond, condition| arel_cond.and(condition) end where(where_clauses) }
![Postモデルから、search_wordsに含まれる単語をAND検索する - Qiita](https://cdn-ak-scissors.b.st-hatena.com/image/square/568ad03114f2a38eaf56cb323cd1ee96d7c84876/height=288;version=1;width=512/https%3A%2F%2Fqiita-user-contents.imgix.net%2Fhttps%253A%252F%252Fcdn.qiita.com%252Fassets%252Fpublic%252Farticle-ogp-background-9f5428127621718a910c8b63951390ad.png%3Fixlib%3Drb-4.0.0%26w%3D1200%26mark64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTkxNiZoPTMzNiZ0eHQ9UG9zdCVFMyU4MyVBMiVFMyU4MyU4NyVFMyU4MyVBQiVFMyU4MSU4QiVFMyU4MiU4OSVFMyU4MCU4MXNlYXJjaF93b3JkcyVFMyU4MSVBQiVFNSU5MCVBQiVFMyU4MSVCRSVFMyU4MiU4QyVFMyU4MiU4QiVFNSU4RCU5OCVFOCVBQSU5RSVFMyU4MiU5MkFORCVFNiVBNCU5QyVFNyVCNCVBMiVFMyU4MSU5OSVFMyU4MiU4QiZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTU2JnR4dC1jbGlwPWVsbGlwc2lzJnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9NjRlYWRhOTM1OWU3MmYwYzMzM2NkZmNiMjdjOTIwMjg%26mark-x%3D142%26mark-y%3D112%26blend64%3DaHR0cHM6Ly9xaWl0YS11c2VyLWNvbnRlbnRzLmltZ2l4Lm5ldC9-dGV4dD9peGxpYj1yYi00LjAuMCZ3PTYxNiZ0eHQ9JTQwcHB3b3JrcyZ0eHQtY29sb3I9JTIzMjEyMTIxJnR4dC1mb250PUhpcmFnaW5vJTIwU2FucyUyMFc2JnR4dC1zaXplPTM2JnR4dC1hbGlnbj1sZWZ0JTJDdG9wJnM9YzcyNDY5MjkwMmE5MzNlYmM0MmVjZmU4ZTdmYTlmNTU%26blend-x%3D142%26blend-y%3D491%26blend-mode%3Dnormal%26s%3D27eb3423f174697e033b2c22128af544)