Datamapper DataMapper

Comments and changes to this ticket

• 

  Piotr Solnica (solnic) May 17th, 2011 @ 02:18 AM

  • Tag changed from “dm-core, dm-validations” to “dm-validations”

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  Emily March 2nd, 2012 @ 10:06 AM

  I'm having this same problem, and it's really infuriating.

  I have the following model:

  class Product
    include DataMapper::Resource
    property :id, Serial
    property :list_price, Decimal
  
    # more properties, not relevant to problem
  end
  

  I want to update that model from a form and not set a list price, so I have params that look something like this:

  { 'product' => { 'list_price' => '' } }
  

  The auto-validations generated for the list_price property have allow_nil: true but not allow_blank: true, meaning that when I update the product with the params above, it's invalid.

  Unlike most of the other auto-validations, it seems there's no way to customize numericality, meaning I have to completely disable auto-validations and manually recreate them. I would expect to be able to do something like one of the following:

  property :list_price, Decimal, numericality: { allow_blank: true }
  property :list_price, Decimal, allow_blank: true
  

  Ideally, though, I shouldn't even have to do that. I think that allow_blank should default to true under the same conditions as allow_nil since otherwise the property can't be updated from a form, which seems like a pretty prime use-case.

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  Jason Seney December 10th, 2012 @ 04:07 PM

  I can confirm this issue also - I don't see how it hasn't come up more often. Since Serials are numerical, this basically means I can't have optional associations. Is there anyway to get around this besides turning off auto validations?