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【Rails】初めてのfind_by

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モデルでわざわざ、scopeを定義したり、
whereを使わなくても、

取得したいレコードが1つで、一意であるのであれば、

find_by

で解決するのではなかろうか??

console.rb
child_id = 1
facility_id = 1
Memo.find_by(child_id: child_id, facility_id: facility_id)
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