質問編集履歴
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大人用
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.users-situation__contents__content__stock
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50箱
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```
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## user.rb
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```ruby
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has_many :mask_users
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has_many :masks, through: :mask_users
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validates :name, :address, :phone, presence: true, uniqueness: true
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```
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## mask.rb
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```ruby
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has_many :mask_users
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has_many :mask_sizes
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has_many :mask_makers
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has_many :mask_stocks
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has_many :mask_prices
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has_many :users, through: :mask_users
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has_many :sizes, through: :mask_sizes
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has_many :makers, through: :mask_makers
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has_many :stocks, through: :mask_stocks
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has_many :prices, through: :mask_prices
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```
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## maker.rb
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```
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has_many :mask_makers
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has_many :masks, through: :mask_makers
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```
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