validates_numericality_of
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validates_numericality_of(*attr_names)
public
Validates whether the value of the specified attribute is numeric by trying to convert it to a float with Kernel.Float (if only_integer is false) or applying it to the regular expression /\A[+\-]?\d+\z/ (if only_integer is set to true).
class Person < ActiveRecord::Base validates_numericality_of :value, on: :create end
Configuration options:
-
:message - A custom error message (default is: “is not a number”).
-
:only_integer - Specifies whether the value has to be an integer, e.g. an integral value (default is false).
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:allow_nil - Skip validation if attribute is nil (default is false). Notice that for Integer and Float columns empty strings are converted to nil.
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:greater_than - Specifies the value must be greater than the supplied value.
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:greater_than_or_equal_to - Specifies the value must be greater than or equal the supplied value.
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:equal_to - Specifies the value must be equal to the supplied value.
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:less_than - Specifies the value must be less than the supplied value.
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:less_than_or_equal_to - Specifies the value must be less than or equal the supplied value.
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:other_than - Specifies the value must be other than the supplied value.
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:odd - Specifies the value must be an odd number.
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:even - Specifies the value must be an even number.
There is also a list of default options supported by every validator: :if, :unless, :on, :allow_nil, :allow_blank, and :strict . See ActiveModel::Validations#validates for more information
The following checks can also be supplied with a proc or a symbol which corresponds to a method:
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:greater_than
-
:greater_than_or_equal_to
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:equal_to
-
:less_than
-
:less_than_or_equal_to
-
:only_integer
For example:
class Person < ActiveRecord::Base validates_numericality_of :width, less_than: ->(person) { person.height } validates_numericality_of :width, greater_than: :minimum_weight end