Dynamic bang finders in Rails 4

Question

Rails 4 is getting rid of dynamic finders, so

User.find_by_hash(hash)

becomes

User.where(hash: hash) # .first

Okay, not a big deal. But what is the best way to deal do with dynamic bang finders like User.find_by_hash!(hash) since there is no where!() method? Rails 4 Release Notes conveniently avoid this.

Update: It plainly says: "All dynamic methods EXCEPT for find_by_... and find_by_...! are deprecated."

Either the pages has changed since or I was blind when reading it.

score 2 · Answer 1 · answered Jan 17 '13 at 07:17

2

I think the new syntax is

User.find_by!(hash: hash)

At least that's how ryanb does it: http://railscasts.com/episodes/400-what-s-new-in-rails-4

Hope that helps.

answered Jan 17 '13 at 07:17

Geoff

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Sorry, this is not the all version. I'm not sure how to do that. – Geoff Jan 17 '13 at 07:30

score 2 · Answer 2 · answered Mar 06 '13 at 20:21

2

Well, if you need a method that finds all but raises exception if the relation is empty, you can create such new method for your models yourself (or mixin to ActiveRecord::QueryMethods). Something like:

def where!(*args)
  rel = where(*args) 
  raise RecordNotFound if rel.empty?
  rel
end

answered Mar 06 '13 at 20:21

moonfly

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Oh, right "All dynamic methods EXCEPT for find_by_... and find_by_...! are deprecated." Either the pages has changed since or I was blind when reading it. – firedev Mar 07 '13 at 04:55

score 2 · Accepted Answer · answered Mar 07 '13 at 05:05

2

It plainly says: "All dynamic methods EXCEPT for find_by_... and find_by_...! are deprecated."

answered Mar 07 '13 at 05:05

firedev

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Dynamic bang finders in Rails 4

3 Answers3