[英]How to validate pg array length in Ruby on Rails 5?
How can I validate how many tags my Note
model has? 如何验证我的
Note
模型有多少个标签? My model currently: 我的模特目前:
# == Schema Information
#
# Table name: notes
#
# id :integer not null, primary key
# title :text
# body :text
# organization_id :integer
# created_at :datetime not null
# updated_at :datetime not null
# tags :string default([]), is an Array
#
# Note represents a saved Note that belongs to an organization.
class Note < ApplicationRecord
belongs_to :organization
validates :title, :body, presence: true
end
tags
is a pg array in the database. tags
是数据库中的pg数组。
Rails will handle conversion internally so you only need to worry about working with a Ruby array object. Rails将在内部处理转换,因此您只需要担心使用Ruby数组对象。
Validation looks like this: 验证看起来像这样:
class Note < ApplicationRecord
validates :tags, length: {
maximum: 10,
message: 'A note can only have a maximum of 10 tags'
}
end
it 'is invalid with more than 10 tags' do
tags = %w(1 2 3 4 5 6 7 8 9 10 11)
note = build(:note, tags: tags)
note.valid?
expect(note.errors[:tags])
.to include('A note can only have a maximum of 10 tags')
end
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