Tuesday, August 19, 2014
In general if you have a "do" you need an "end", although sometimes ruby interprets the end of your block for you. (but generally it is good practice to always end a "do" with an "end")
Your discrepancy (and confusion) has to do with the way has_many is receiving arguments.
In Rails 4, the second parameter is scope (in rails 3, the second parameter was options)
has_many :children, dependent: :destroy, -> { order 'id asc' } do
you have your arity reversed --- the block you are trying to pass in should come first, followed by the options (this is documented here http://apidock.com/rails/v4.0.2/ActiveRecord/Associations/ClassMethods/has_many)
I don't know why would need or want a "do" statement at the end of that line or anywhere in that line -- it is incorrect, just remove it.
On Aug 18, 2014, at 3:26 PM, Antonio Moreno <lists@ruby-forum.com> wrote:
Hi,
in Ruby on Rails 4, let's say a parent has many children. Then I wanted
to reference only the persisted records in an active record association,
and followed this link's accepted answer
(http://stackoverflow.com/questions/19842765/how-do-you-reference-only-the-persisted-records-in-an-active-record-association).
This works good:
class Parent < ActiveRecord::Base
has_many :children, dependent: :destroy do
def persisted
collect { |a| a if a.persisted? }
end
end
Now, I want to order the associated records:
has_many :children, dependent: :destroy, -> { order 'id asc' } do
but this raises an error:
SyntaxError in ParentsController#index
...trunk/app/models/parent.rb:3: syntax error, unexpected
keyword_do_block, expecting => ...trunk/app/models/parent.rb:49: syntax
error, unexpected keyword_end, expecting end-of-input
However, this does work:
has_many :children, -> { order 'id asc' } do
I can't even find documentation on how to use the do_block on an
association. I'd like to know why it doesn't work what I am trying to
do. Any help appreciated.
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