1class Project < ActiveRecord::Base |
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2 has_and_belongs_to_many :users |
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4 validate :require_at_least_on_user,on: :update # |
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6 validates :name, presence: true, length: { minimum: 1, maximum: 50 }, uniqueness: true |
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8 private
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10 def require_at_least_on_user |
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11 if !users || users.size == 0 # size |
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12 errors[:users] = 'at least one user in the project' |
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13 end |
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14 end |
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15end |