How do I pass more than one argument to Proc in ruby/rails?

Question

The following is giving me issue:

accepts_nested_attributes_for :photo, :reject_if => proc { |attributes| attributes['image'].blank? }, :reject_if => proc { |attributes| attributes['photo_title'].blank? }, :allow_destroy => true

I think it's because I'm calling :reject_if twice, not 100% sure. But when ever I uncomment the photo_title reject_if line my image doesn't get upload if I select one. If I comment the line out then it does.

How can I combine both conditions into one reject_if condition? If that makes sense.

Kind regards

why don't you use an extern method to cleanly handle the logic? — apneadiving
– apneadiving, Commented May 12, 2012 at 12:31

mu is too short · Accepted Answer · 2012-05-12 16:24:29Z

This:

accepts_nested_attributes_for :photo, :reject_if => proc { |attributes| attributes['image'].blank? }, :reject_if => proc { |attributes| attributes['photo_title'].blank? }, :allow_destroy => true

is the same as this:

accepts_nested_attributes_for :photo, { :reject_if => proc { |attributes| attributes['image'].blank? }, :reject_if => proc { |attributes| attributes['photo_title'].blank? }, :allow_destroy => true }

The fat-arrow arguments are actually a Hash, the braces are essentially added by Ruby behind your back. A Hash doesn't allow duplicate keys so the second :reject_if value overwrites the first one and you end up with this:

accepts_nested_attributes_for :photo, :reject_if => proc { |attributes| attributes['photo_title'].blank? }, :allow_destroy => true

You can combine both conditions in one Proc though:

accepts_nested_attributes_for :photo, :reject_if => proc { |attributes| attributes['image'].blank? || attributes['photo_title'].blank? }, :allow_destroy => true

You could also use a separate method:

accepts_nested_attributes_for :photo, :reject_if => :not_all_there, :allow_destroy => true def not_all_there(attributes) attributes['image'].blank? || attributes['photo_title'].blank? end

Suborx · Accepted Answer · 2012-05-12 12:23:10Z

1

Try this

accepts_nested_attributes_for :photo, :reject_if => proc { |attributes| attributes['image'].blank? || attributes['photo_title'].blank?}, :allow_destroy => true

answered May 12, 2012 at 12:23

Suborx

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1 Comment

LondonGuy Over a year ago

The same thing is happening so I guess theres a deeper issue. I have set :_destroy => "1" on both of those fields so not sure why it's not working.

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How do I pass more than one argument to Proc in ruby/rails?

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