15 lines
463 B
Ruby
15 lines
463 B
Ruby
class Project < ActiveRecord::Base
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has_and_belongs_to_many :users
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validate :require_at_least_on_user # 项目中最少要有一个用户
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validates :name, presence: true, length: { minimum: 1, maximum: 50 }, uniqueness: true
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private
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def require_at_least_on_user
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if !users || users.size == 0 # 这里使用size，可以智能选择需不需要查询数据库
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errors[:users] = 'at least one user in the project'
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end
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end
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end
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