Rails validators

validates :name, length: { minimum: 2 } # or { maximum: 500 } or { in: 6..20 } or { is: 6 } 
validates :name, :login, :email, presence: true
validates :email, uniqueness: true
validates :switch, inclusion: { in: [true, false]  }
validates :terms_of_service, acceptance: true
validates :size, inclusion: { in: %w(small medium large), message: "%{value} is not a valid size" }
validates :legacy_code, format: { with: /\A[a-zA-Z]+\z/, message: "only allows letters" }

Source: guides.rubyonrails.org

Similar codes

0 vote310 views2 answers
Ruby get the number of same element in array
Ruby
0 vote255 views1 answer
Rails check routes in console
Ruby
0 vote305 views1 answer
Or even multiple scope parameters. For example, making sure that a teacher can only be on the schedule once per semester for a particular class.
Ruby
5 votes342 views1 answer
See all rails routes in browser
Ruby
0 vote301 views1 answer
Ruby multiline comment
Ruby
0 vote301 views1 answer
Rails form tag float
Ruby
0 vote239 views2 answers
&. ruby
Ruby
1 vote329 views1 answer
Ruby filter
Ruby
6 votes392 views4 answers
Ruby iterate over array
Ruby
0 vote279 views1 answer
Helper path outside view
Ruby