Rails validate multiple attributes lambda only if all of them present

Question

I need to validate few attributes in my model only when they are present in params while updating or creating the object.

 validates :attribute_a,format: {with: /some_regex/},  :if => lambda{ |object| object.attribute_a.present? }

Like attribute_a there are multiple attributes which may not be present while being created or updated.Instead of writing the validates statement for each of them,is there a way in which I can check the presence of multiple attributes and then validate every one with a common validation such as inclusion_inor format:{with:/some_regex/ }.

I wanted something like the following code which obviously is wrong.

validates :attribute_a,attribute_b,attribute_c,attribute_d,:format => {:with =>
 /some_regex/},  :if => lambda{ |object| object.attribute_name.present? }

By present in this case you mean not blank (nil/"")?

Mike Szyndel
– Mike Szyndel

2013-09-03 16:26:27 +00:00
Commented Sep 3, 2013 at 16:26 — Mike Szyndel
– Mike Szyndel, Commented Sep 3, 2013 at 16:26
The attribute is not present.So it is not nil.

user2512324
– user2512324

2013-09-03 17:00:16 +00:00
Commented Sep 3, 2013 at 17:00 — user2512324
– user2512324, Commented Sep 3, 2013 at 17:00

Shadwell · Accepted Answer · 2013-09-03 16:30:00Z

2

You can use validates_format_of:

validates_format_of :attr_a, :attr_b, 
    with: /someregexp/,
    allow_blank: true

The allow blank option means that the regexp doesn't have to match if the attribute is not present.

answered Sep 3, 2013 at 16:30

Shadwell

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1 Comment

user2512324 Over a year ago

Works.Silly question overall.My folly.

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