Sprawdź liczbę ma wiele elementów w Ruby on Rails
Użytkownicy mogą dodawać tagi do fragmentu:
class Snippet < ActiveRecord::Base
# Relationships
has_many :taggings
has_many :tags, :through => :taggings
belongs_to :closing_reason
end
Chcę zweryfikować liczbę tagów: co najmniej 1, co najwyżej 6. Jak mam to zrobić? Dzięki.
63
3 answers
Zawsze możesz utworzyć walidację niestandardową .
Coś jak
validate :validate_tags
def validate_tags
errors.add(:tags, "too much") if tags.size > 5
end
68
Author: Nikita Rybak,
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2014-01-31 01:00:32
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2014-01-31 01:00:32
Lepsze rozwiązanie dostarczył @SooDesuNe on this so post
validates :tags, length: { minimum: 1, maximum: 6 }
71
Author: sbonami,
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2017-05-23 12:26:08
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2017-05-23 12:26:08
Myślę, że możesz zweryfikować używając .reject(&:marked_for_destruction?).length
.
class User < ActiveRecord::Base
has_many :groups do
def length
reject(&:marked_for_destruction?).length
end
end
accepts_nested_attributes_for :groups, allow_destroy: true
validates :groups, length: { maximum: 5 }
end
Albo to.
class User < ActiveRecord::Base
has_many :groups
accepts_nested_attributes_for :groups, allow_destroy: true
GROUPS_MAX_LENGTH = 5
validate legth_of_groups
def length_of_groups
groups_length = 0
if groups.exists?
groups_length = groups.reject(&:marked_for_destruction?).length
end
errors.add(:groups, 'too many') if groups_length > GROUPS_MAX_LENGTH
end
end
Wtedy możesz dowodzić.
@user.assign_attributes(params[:user])
@user.valid?
Dziękuję za przeczytanie.
Bibliografia:
Http://homeonrails.com/2012/10/validating-nested-associations-in-rails / http://qiita.com/asukiaaa/items/4797ce44c3ba7bd7a51f
7
Author: asukiaaa,
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2019-03-08 09:58:54
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2019-03-08 09:58:54