# Join query in rails **URL:** \ **Category:** Rails\ **Created:** [April 9, 2009, 12:40pm UTC](https://www.ruby-forum.com/t/join-query-in-rails/165132 "2009-04-09T12:40:43Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![newb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/2acd7d/32.png) [@newb](https://www.ruby-forum.com/u/newb)\ **Post date:** [April 9, 2009, 12:40pm UTC](https://www.ruby-forum.com/t/join-query-in-rails/165132/1 "2009-04-09T12:40:43Z")
Hi… how i should write the below query in rails.i found through mysql tutorial.i m not pro in rails …so give some lights… SELECT \* FROM contactinfo join userinfo on contactinfo.contact\_id = userinfo.id where contactinfo.user\_id = 25 Thanks in advance ---
**Author:** ![newb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/2acd7d/32.png) [@newb](https://www.ruby-forum.com/u/newb)\ **Post date:** [April 9, 2009, 1:08pm UTC](https://www.ruby-forum.com/t/join-query-in-rails/165132/2 "2009-04-09T13:08:31Z")
On Thu, Apr 9, 2009 at 12:40 PM, Newb N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Hi… > how i should write the below query in rails.i found through mysql > tutorial.i m not pro in rails …so give some lights… > > SELECT \* FROM contactinfo join userinfo on contactinfo.contact\_id = > userinfo.id where contactinfo.user\_id = 25 > > Thanks in advance It would all depend on the models you’re using. That db schema is not technically Rails friendly in that the table names should be user\_infos and contact\_infos resulting in models named UserInfo and ContactInfo Then you could use the following: model ContactInfo has\_one :user\_info #or has\_many :user\_infos end model UserInfo belongs\_to :contact\_info end and then… contact\_info = ContactInfo.new 25 user\_info = contact\_info.user\_info Rails deals with all the sql in the background 🙂 Andrew T. [http://ramblingsonrails.com](http://ramblingsonrails.com) [http://www.linkedin.com/in/andrewtimberlake](http://www.linkedin.com/in/andrewtimberlake) “I have never let my schooling interfere with my education” - Mark Twain ---
**Author:** ![newb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/2acd7d/32.png) [@newb](https://www.ruby-forum.com/u/newb)\ **Post date:** [April 9, 2009, 1:08pm UTC](https://www.ruby-forum.com/t/join-query-in-rails/165132/3 "2009-04-09T13:08:39Z")
Newb N. wrote: > Hi… > how i should write the below query in rails.i found through mysql > tutorial.i m not pro in rails …so give some lights… > > SELECT \* FROM contactinfo join userinfo on contactinfo.contact\_id = > userinfo.id where contactinfo.user\_id = 25 > > Thanks in advance @contactinfo= Contactinfo.find(:all, :joins =\> “contactinfos inner join userinfos as u on contactinfos.contact\_id=u.id”, :conditions =\> [“contactinfos.contact\_id =?”, 25]) ---
**Author:** ![newb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/2acd7d/32.png) [@newb](https://www.ruby-forum.com/u/newb)\ **Post date:** [April 9, 2009, 3:14pm UTC](https://www.ruby-forum.com/t/join-query-in-rails/165132/4 "2009-04-09T15:14:30Z")
Priya B. wrote: > Newb N. wrote: > > > Hi… > > how i should write the below query in rails.i found through mysql > > tutorial.i m not pro in rails …so give some lights… > > > > SELECT \* FROM contactinfo join userinfo on contactinfo.contact\_id = > > userinfo.id where contactinfo.user\_id = 25 > > > > Thanks in advance > > @contactinfo= Contactinfo.find(:all, :joins =\> “contactinfos inner join > userinfos as u on contactinfos.contact\_id=u.id”, :conditions =\> > [“contactinfos.contact\_id =?”, 25]) Thanks for the reply… using this query i can able to get only the contactinfo table fields but i want to get userinfo table fields as well as contactinfo fields also… how can i get that… pls guide me on this ---
**Author:** ![newb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/2acd7d/32.png) [@newb](https://www.ruby-forum.com/u/newb)\ **Post date:** [April 10, 2009, 9:28am UTC](https://www.ruby-forum.com/t/join-query-in-rails/165132/5 "2009-04-10T09:28:58Z")
i think this is the way you should write like this… as i am also new to rails ContactInfo.find(:all, :join =\> user\_info) On Thu, Apr 9, 2009 at 4:10 PM, Newb N. ---
**Author:** ![newb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/2acd7d/32.png) [@newb](https://www.ruby-forum.com/u/newb)\ **Post date:** [April 10, 2009, 10:41am UTC](https://www.ruby-forum.com/t/join-query-in-rails/165132/6 "2009-04-10T10:41:41Z")
You can use :select option in the same query… ---
**Author:** ![newb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/2acd7d/32.png) [@newb](https://www.ruby-forum.com/u/newb)\ **Post date:** [April 9, 2009, 3:21pm UTC](https://www.ruby-forum.com/t/join-query-in-rails/165132/7 "2009-04-09T15:21:48Z")
On Thu, Apr 9, 2009 at 3:14 PM, Newb N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > Thanks in advance > > > how can i get that… > > > pls guide me on this > > > – Don’t think of merging them into one result set, think of them as two seperate sets of data (or models) that are related. That’s the way Rails treats the data and it works very well. I understand that you’re new to Rails but take some time to get to understand Rails way of doing things and your life will be much easier. Andrew T. [http://ramblingsonrails.com](http://ramblingsonrails.com) [http://www.linkedin.com/in/andrewtimberlake](http://www.linkedin.com/in/andrewtimberlake) “I have never let my schooling interfere with my education” - Mark Twain ---
**Author:** ![newb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/2acd7d/32.png) [@newb](https://www.ruby-forum.com/u/newb)\ **Post date:** [April 10, 2009, 10:52am UTC](https://www.ruby-forum.com/t/join-query-in-rails/165132/8 "2009-04-10T10:52:41Z")
Priya B. wrote: > You can use :select option in the same query… yes priya i used but i get error …it gives me unknown column could you give the sample @contactinfo= ContactInfo.find(:all,:select =\> “userinfo.first\_name,contactinfo.user\_id”, :joins =\> “contactinf inner join userinfo as u on contactinfo.contact\_id=u.id”, :conditions =\> [“contactinfo.user\_id=?”, 25]) pls help me ya Thanks ---
**Author:** ![newb](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/2acd7d/32.png) [@newb](https://www.ruby-forum.com/u/newb)\ **Post date:** [April 10, 2009, 11:46am UTC](https://www.ruby-forum.com/t/join-query-in-rails/165132/9 "2009-04-10T11:46:32Z")
why don’t you use the build options in the framework? specify the joins / relations in the model. Then do @user = User.find(params[:id]) (controller) View: \<=% @user.contactinfo.telephone %\> or \<% for user in @users do |t| %\> \<%= t.contactinfo.telefone %\> \<%= t.contactinfo.fax %\> If you cant to do other types of joins, use the include option in the controller. On Apr 10, 10:52 am, Newb N. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)