# Using the collect method to collect to a 2 dimensional array **URL:** \ **Category:** Rails\ **Created:** [September 10, 2008, 8:24am UTC](https://www.ruby-forum.com/t/using-the-collect-method-to-collect-to-a-2-dimensional-array/148188 "2008-09-10T08:24:08Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 10, 2008, 8:24am UTC](https://www.ruby-forum.com/t/using-the-collect-method-to-collect-to-a-2-dimensional-array/148188/1 "2008-09-10T08:24:08Z")
Hi I am trying to collect name and email of a person to an array (Or hash?) like [[name1,emailid],[name2,emailid]…] But I dont know how to do that. I tried like email\_array = Contact.get\_email\_id\_and\_name\_of\_contacts(problem.reported\_by\_id) unless problem.reported\_by\_id.blank? And in Contact class def self.get\_email\_ids\_of\_contacts(contact\_id) return Contact.find\_by\_id(contact\_id).name, Contact.find\_by\_id(contact\_id).contact\_email\_addresses.find(:all, :conditions =\> [‘contact\_email\_address\_type\_id=?’,2]).collect { |mail| mail.email} end ``` Here I tried to return two value at a time .But not suceeded .How ``` can I do that?Please help Sijo ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 10, 2008, 8:56am UTC](https://www.ruby-forum.com/t/using-the-collect-method-to-collect-to-a-2-dimensional-array/148188/2 "2008-09-10T08:56:05Z")
On 10 Sep 2008, at 07:24, Sijo Kg wrote: > unless Collect just bungs whatever your block evaluates to in an array. If that block evaluates to an array then you’ll get an array of arrays back. Fred ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 10, 2008, 6:20pm UTC](https://www.ruby-forum.com/t/using-the-collect-method-to-collect-to-a-2-dimensional-array/148188/3 "2008-09-10T18:20:59Z")
Sijo, not sure, but looking at your code it seems you may want to do something like the following def self.get\_email\_ids\_of\_contacts(contact\_id) contact = Contact.find\_by\_id(contact\_id) contact.contact\_email\_addresses.find(:all, :conditions =\> []).map do |mail| [contact.name, mail.email] end end Sijo Kg wrote: > def self.get\_email\_ids\_of\_contacts(contact\_id) > return Contact.find\_by\_id(contact\_id).name, > Contact.find\_by\_id(contact\_id).contact\_email\_addresses.find(:all, > :conditions =\> [‘contact\_email\_address\_type\_id=?’,2]).collect { |mail| > mail.email} > end ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 11, 2008, 10:07am UTC](https://www.ruby-forum.com/t/using-the-collect-method-to-collect-to-a-2-dimensional-array/148188/4 "2008-09-11T10:07:38Z")
On Sep 11, 6:28 am, Sijo Kg [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > end > But this does not give array like above?Could you please tell me > where is the fault?A group may have more than one manager and each > manager has more than one email addresses of the above type.That is why > I wrote code like above Groups and Contacts are connected through user > groups (has\_many :through relation) You’re generating these arrays using map but then you’re just throwing them away (each returns the collection it iterated over. Perhaps you mean that to be map or inject instead to concatenate the various arrays produced? Fred ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 11, 2008, 7:28am UTC](https://www.ruby-forum.com/t/using-the-collect-method-to-collect-to-a-2-dimensional-array/148188/5 "2008-09-11T07:28:49Z")
Hi Lots of thanks for your great reply.This is what i needed.Now it works. But I have one more problem. I have to find group managers name and email like above and I tried like below name\_and\_email\_managers=Group.get\_managers\_name\_and\_emails(problem.primary\_assignee\_group\_id) unless problem.primary\_assignee\_group\_id.blank? And now in Group class def self.get\_managers\_name\_and\_emails(grp\_id) managers=Group.find\_by\_id(grp\_id).contacts.find(:all,:conditions =\> [‘group\_user\_type\_id = ?’,4]) managers.each do |manager| manager.contact\_email\_addresses.find(:all, :conditions =\> [‘contact\_email\_address\_type\_id=?’,2]).map do |mail| [manager.name,mail.email] end end end But this does not give array like above?Could you please tell me where is the fault?A group may have more than one manager and each manager has more than one email addresses of the above type.That is why I wrote code like above Groups and Contacts are connected through user groups (has\_many :through relation) Sijo ---
**Author:** ![sijo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/da6949/32.png) [@sijo](https://www.ruby-forum.com/u/sijo)\ **Post date:** [September 11, 2008, 5:17pm UTC](https://www.ruby-forum.com/t/using-the-collect-method-to-collect-to-a-2-dimensional-array/148188/6 "2008-09-11T17:17:35Z")
Frederick C. wrote: > On Sep 11, 6:28�am, Sijo Kg [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > end > > � � � � But this does not give array like above?Could you please tell me > > where is the fault?A group may have more than one manager and each > > manager has more than one email addresses of the above type.That is why > > I wrote code like above �Groups and Contacts are connected through user > > groups (has\_many :through relation) > > You’re generating these arrays using map but then you’re just throwing > them away (each returns the collection it iterated over. Perhaps you > mean that to be map or inject instead to concatenate the various > arrays produced? > > Fred Array.partial