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#3975 ✓stale

ActiveRecord attribute accessor String, and Element Reference []

Reported by Daniel | February 16th, 2010 @ 11:15 PM


There appears to be an easy misunderstanding with the accessor method and the String.

class User << ActiveRecord::Base

Having table columns email:string, flags:string

if I set

user = Users(:myuser) # fixture""

This behaves quite differently.

Changing causes a change in user.@changed_attributes, and user.@attributes.
But the user.flags[7] causes in user.@attributes, but not @changed_attributes.

I suspect this is caused by an easy mis-understanding that user.flags is an accessor.

So, the code could be inferred to look like this
(user.flags)[7]="1" Which directly changes the @attributes, but does not invoke the subroutine to record it in @changed_attributes.

I suspect the best way to fix this to create a RoRString class with [] overloaded as follows

class RoR_String < String
def []=(var, replace)

super(var, replace)
# call back to record new value in @change_attributes

end end

This seams considerably larger than a patch, since this would affect all RoR ActiveRecord strings.


Daniel Lo

Comments and changes to this ticket

  • Santiago Pastorino

    Santiago Pastorino February 2nd, 2011 @ 04:54 PM

    • State changed from “new” to “open”

    This issue has been automatically marked as stale because it has not been commented on for at least three months.

    The resources of the Rails core team are limited, and so we are asking for your help. If you can still reproduce this error on the 3-0-stable branch or on master, please reply with all of the information you have about it and add "[state:open]" to your comment. This will reopen the ticket for review. Likewise, if you feel that this is a very important feature for Rails to include, please reply with your explanation so we can consider it.

    Thank you for all your contributions, and we hope you will understand this step to focus our efforts where they are most helpful.

  • Santiago Pastorino

    Santiago Pastorino February 2nd, 2011 @ 04:55 PM

    • State changed from “open” to “stale”

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