# Can we add a string to a instance varaiable **URL:** \ **Category:** Rails\ **Created:** [June 16, 2008, 8:31am UTC](https://www.ruby-forum.com/t/can-we-add-a-string-to-a-instance-varaiable/140557 "2008-06-16T08:31:19Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![vamsi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/b38774/32.png) [@vamsi](https://www.ruby-forum.com/u/vamsi)\ **Post date:** [June 16, 2008, 8:31am UTC](https://www.ruby-forum.com/t/can-we-add-a-string-to-a-instance-varaiable/140557/1 "2008-06-16T08:31:19Z")
HI , can we add a string to an instance variable like @jan+"#{users}"=User.find(:all) because i’ve the same query to be executed for both User and Post, for every month jan…dec. so can i write a method which contains @jan+"#{name}"=#{Name}.find(:all) name–\> either post or user that i pass to the method… and how to convert Name i,e; string into object? plz reply… ---
**Author:** ![vamsi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/b38774/32.png) [@vamsi](https://www.ruby-forum.com/u/vamsi)\ **Post date:** [June 16, 2008, 8:41am UTC](https://www.ruby-forum.com/t/can-we-add-a-string-to-a-instance-varaiable/140557/2 "2008-06-16T08:41:38Z")
User.find(:all).group\_by(&:month) ---
**Author:** ![vamsi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/b38774/32.png) [@vamsi](https://www.ruby-forum.com/u/vamsi)\ **Post date:** [June 16, 2008, 9:00am UTC](https://www.ruby-forum.com/t/can-we-add-a-string-to-a-instance-varaiable/140557/3 "2008-06-16T09:00:47Z")
Ryan B. wrote: > User.find(:all).group\_by(&:month) i need some thing like @jan is an instance varaible and can i add a string like name=“hi” to the instance variable like @jan+"#{name}" is it possible and even i want to know can we convert a string object into object(instance)? like we do in java to\_String() and to\_Object() ? ---
**Author:** ![vamsi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/b38774/32.png) [@vamsi](https://www.ruby-forum.com/u/vamsi)\ **Post date:** [June 16, 2008, 9:06am UTC](https://www.ruby-forum.com/t/can-we-add-a-string-to-a-instance-varaiable/140557/4 "2008-06-16T09:06:52Z")
Why? What are you trying to accomplish? On Mon, Jun 16, 2008 at 4:30 PM, Vamsi K. \< removed\_email\_address@domain.invalid\> wrote: > > – Appreciated my help? Recommend me on Working With Rails [http://workingwithrails.com/person/11030-ryan-bigg](http://workingwithrails.com/person/11030-ryan-bigg) ---
**Author:** ![vamsi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/b38774/32.png) [@vamsi](https://www.ruby-forum.com/u/vamsi)\ **Post date:** [June 16, 2008, 9:50am UTC](https://www.ruby-forum.com/t/can-we-add-a-string-to-a-instance-varaiable/140557/5 "2008-06-16T09:50:36Z")
On Jun 16, 8:31 am, Vamsi K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > so the query is same for both of them… > > so can i write > > @jan+“#{name}”=“#{Name}”.find(:all,:condition=\>[“created\_at between ? > AND ?”,“#{changedyear}-01-01”,“#{changedyear}-01-31”]) where name may be > post or user … Well I thin you’re looking for instance\_variable\_set and constantize, but personally I’d put most of that method in the post/user model (and probably return a hash keyed by the month you’re looking at). Fred ---
**Author:** ![vamsi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/b38774/32.png) [@vamsi](https://www.ruby-forum.com/u/vamsi)\ **Post date:** [June 16, 2008, 9:31am UTC](https://www.ruby-forum.com/t/can-we-add-a-string-to-a-instance-varaiable/140557/6 "2008-06-16T09:31:04Z")
Ryan B. wrote: > Why? What are you trying to accomplish? > > On Mon, Jun 16, 2008 at 4:30 PM, Vamsi K. \< > removed\_email\_address@domain.invalid\> wrote: > > > > > > – > Appreciated my help? > Recommend me on Working With Rails > [http://workingwithrails.com/person/11030-ryan-bigg](http://workingwithrails.com/person/11030-ryan-bigg) yeah, to be clear … i’ve 2 methods one for posts and another for users… i’d like to get number of users for every month and same for number of posts for every month… for that i had written like ``` @januser=User.find(:all,:condition=>["created_at between ``` ? AND ?“,”#{changedyear}-01-01",“#{changedyear}-01-31”]) like this for every month as i don’t 've a feild name month in database… and the same query can be used by post like @janpost=Post.find(:all,:condition=\>[“created\_at between ? AND ?”,“#{changedyear}-01-01”,“#{changedyear}-01-31”]) and changedyear is a dynamic one… so the query is same for both of them… so can i write @jan+“#{name}”=“#{Name}”.find(:all,:condition=\>[“created\_at between ? AND ?”,“#{changedyear}-01-01”,“#{changedyear}-01-31”]) where name may be post or user … ---
**Author:** ![vamsi](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/b38774/32.png) [@vamsi](https://www.ruby-forum.com/u/vamsi)\ **Post date:** [June 16, 2008, 9:59am UTC](https://www.ruby-forum.com/t/can-we-add-a-string-to-a-instance-varaiable/140557/7 "2008-06-16T09:59:30Z")
The finder methods generated by ActiveRecord take a range (I think), so you can find the start date for January and then the end date and do something like this: Post.find\_all\_by\_created\_at(beginning\_of\_january…end\_of\_january)