thr3ads.net - Rails - Outputting a string from an array of objects [Feb 2011]

If this information is useful, please help other people find it:
Share via:

Peter D Bethke

2011-Feb-24 17:07 UTC

Outputting a string from an array of objects

Hi All,

Newbie here working with an existing Rails project. I''m trying to
create a method that will return a simple string of object values.

I have an app that has companies that each are assigned to one or more branches.
Then I have a contact who is assigned to a company. I''ve created an
association with belongs_to for both the company and branch, and the branch and
company has their own class in AR.

So

 def get_company_branches
 
   my_branches =  self.company.branches
   my_list = my_branches.each { |x| puts x.branch_name }
   return my_list
 end

For some reason this returns an object id (the raw ruby object id I think) not
the string i am looking for. Any suggestions?

Best,

Peter

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Frederick Cheung

2011-Feb-24 18:01 UTC

head link

Re: Outputting a string from an array of objects

On Feb 24, 5:07 pm, Peter D Bethke
<peter.bet...-ee4meeAH724@public.gmane.org> wrote:> Hi All,
>
> Newbie here working with an existing Rails project. I''m trying to
create a method that will return a simple string of object values.
>
> I have an app that has companies that each are assigned to one or more
branches. Then I have a contact who is assigned to a company. I''ve
created an association with belongs_to for both the company and branch, and the
branch and company has their own class in AR.
>
> So
>
>  def get_company_branches
>
>    my_branches =  self.company.branches
>    my_list = my_branches.each { |x| puts x.branch_name }
>    return my_list
>  end
>
> For some reason this returns an object id (the raw ruby object id I think)
not the string i am looking for. Any suggestions?
>
puts just dumps things to stdout, so you definitely don''t want to be
using that here.
If you want to create an array based on the value of each object in a
collection then you should use collect (also available as map). It
creates a new array containing the result of evaluating the block for
each object of the original collection.

Fred

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Peter D Bethke

2011-Feb-24 18:12 UTC

head link

Re: Re: Outputting a string from an array of objects

Thanks Fred!

Does this look right? I''m still getting an error for some reason:

 def get_company_branches
 
   my_branches =  self.company.branches
   my_list = my_branches.branch_name.collect! { |x| x + "," }
   return my_list
 end

looking for it to output a concatenated string - still erroring out tho. :(

Peter

On Feb 24, 2011, at 1:01 PM, Frederick Cheung wrote:
> 
> 
> On Feb 24, 5:07 pm, Peter D Bethke
<peter.bet...-ee4meeAH724@public.gmane.org> wrote:
>> Hi All,
>> 
>> Newbie here working with an existing Rails project. I''m trying
to create a method that will return a simple string of object values.
>> 
>> I have an app that has companies that each are assigned to one or more
branches. Then I have a contact who is assigned to a company. I''ve
created an association with belongs_to for both the company and branch, and the
branch and company has their own class in AR.
>> 
>> So
>> 
>>  def get_company_branches
>> 
>>    my_branches =  self.company.branches
>>    my_list = my_branches.each { |x| puts x.branch_name }
>>    return my_list
>>  end
>> 
>> For some reason this returns an object id (the raw ruby object id I
think) not the string i am looking for. Any suggestions?
>> 
> 
> puts just dumps things to stdout, so you definitely don''t want to
be
> using that here.
> If you want to create an array based on the value of each object in a
> collection then you should use collect (also available as map). It
> creates a new array containing the result of evaluating the block for
> each object of the original collection.
> 
> Fred
> 
> -- 
> You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
> To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
> For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.
> 
-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Michael Pavling

2011-Feb-24 18:15 UTC

head link

Re: Outputting a string from an array of objects

On 24 February 2011 17:07, Peter D Bethke
<peter.bethke-ee4meeAH724@public.gmane.org> wrote:>  def get_company_branches
>   my_branches =  self.company.branches
>   my_list = my_branches.each { |x| puts x.branch_name }
>   return my_list
>  end
You might find that something like this is what you''re after:

  def get_company_branches
    self.company.branches.collect(&:branch_name).join(", ") if
self.company && self.company.branches
  end

Have a look at the methods available to Array and Enumerable in both
the Rails and Ruby apis.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Michael Pavling

2011-Feb-24 18:24 UTC

head link

Re: Re: Outputting a string from an array of objects

On 24 February 2011 18:12, Peter D Bethke
<peter.bethke-ee4meeAH724@public.gmane.org> wrote:> Thanks Fred!
>
> Does this look right? I''m still getting an error for some reason:
Always post the error... just saying "I''ve got one"
doesn''t help
people point out where you might be having problems (although in this
case, it''s ruby syntax... check the API for the ".collect"
method :-)

  def get_company_branches
    my_branches =  self.company.branches # you don''t really need these
intermediate variables... just use self.branches.collect....
    my_list = my_branches.collect { |x| x.branch_name }
    return my_list.join(", ") # "collect" returns an array,
so we can
join the array into a string, or maybe use the "to_sentence" extension
to prettify it
  end

...my previous method just does the same, a little more compact.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Frederick Cheung

2011-Feb-24 22:20 UTC

head link

Re: Outputting a string from an array of objects

On Feb 24, 6:12 pm, Peter D Bethke
<peter.bet...-ee4meeAH724@public.gmane.org> wrote:> Thanks Fred!
>
> Does this look right? I''m still getting an error for some reason:
>
>  def get_company_branches
>
>    my_branches =  self.company.branches
>    my_list = my_branches.branch_name.collect! { |x| x + "," }
>    return my_list
>  end
You need to call collect (you don''t want collect!) on the array, not
on the branch_name for an individual branch

Fred>
> looking for it to output a concatenated string - still erroring out tho. :(
>
> Peter
>
> On Feb 24, 2011, at 1:01 PM, Frederick Cheung wrote:
>
>
>
>
>
> > On Feb 24, 5:07 pm, Peter D Bethke
<peter.bet...-ee4meeAH724@public.gmane.org> wrote:
> >> Hi All,
>
> >> Newbie here working with an existing Rails project. I''m
trying to create a method that will return a simple string of object values.
>
> >> I have an app that has companies that each are assigned to one or
more branches. Then I have a contact who is assigned to a company. I''ve
created an association with belongs_to for both the company and branch, and the
branch and company has their own class in AR.
>
> >> So
>
> >>  def get_company_branches
>
> >>    my_branches =  self.company.branches
> >>    my_list = my_branches.each { |x| puts x.branch_name }
> >>    return my_list
> >>  end
>
> >> For some reason this returns an object id (the raw ruby object id
I think) not the string i am looking for. Any suggestions?
>
> > puts just dumps things to stdout, so you definitely don''t
want to be
> > using that here.
> > If you want to create an array based on the value of each object in a
> > collection then you should use collect (also available as map). It
> > creates a new array containing the result of evaluating the block for
> > each object of the original collection.
>
> > Fred
>
> > --
> > You received this message because you are subscribed to the Google
Groups "Ruby on Rails: Talk" group.
> > To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> > To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> > For more options, visit this group
athttp://groups.google.com/group/rubyonrails-talk?hl=en.
-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.

Rails - Feb 2011 - Outputting a string from an array of objects

Outputting a string from an array of objects

Re: Outputting a string from an array of objects

Re: Re: Outputting a string from an array of objects

Re: Outputting a string from an array of objects

Re: Re: Outputting a string from an array of objects

Re: Outputting a string from an array of objects