Hello all
I have problem regarding hash and array
I am retriving records using find method and then doing some operations
on it
and finally i got results like following
[{"1"=>"75225",
"2"=>"Sat"},{"1"=>"75225",
"2"=>"Sat"}]
which contains array of hashes
when we write simple find method of any tables it returns
[#, #, #, #] in this way
so can anybody tell me what is difference between this 2 types of array
becuase I dont want to modify my view file
Also can i convert first array of hashes to acitve record type of array
of hashes
how can we do that ?
Thanks
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On Feb 21, 11:00 am, Cyrus Dev <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> Hello all > > I have problem regarding hash and array > > I am retriving records using find method and then doing some operations > on it > and finally i got results like following > > [{"1"=>"75225", "2"=>"Sat"},{"1"=>"75225", "2"=>"Sat"}] > > which contains array of hashes > > when we write simple find method of any tables it returns > > [#, #, #, #] in this waySounds like your view just contains <%= some_array %> Which means that you''ll just get the result of calling to_s on each of your array elements, which is unlikely to be useful and also invalid html since what it outputs is something like #<SomeObject: 0x12345678> . It is up to you to produce some meaningful textual output for your array elements (eg <%= h some_array.inspect %> but even that is pretty crude) Fred> > so can anybody tell me what is difference between this 2 types of array > > becuase I dont want to modify my view file > > Also can i convert first array of hashes to acitve record type of array > of hashes > > how can we do that ? > > Thanks > -- > Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---
thanks fred
but in o/p
when we use find method and print that object it shows like that
[#, #, #, #]
but when i modify same array with some operations
i got array like this
[{"1"=>"75225",
"2"=>"Sat"},{"1"=>"75225",
"2"=>"Sat"}]
now can I convert this as like above like active record type of array ?
Frederick Cheung wrote:> On Feb 21, 11:00�am, Cyrus Dev
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
> wrote:
>> which contains array of hashes
>>
>> when we write simple find method of any tables it returns
>>
>> [#, #, #, #] in this way
>
> Sounds like your view just contains <%= some_array %>
>
> Which means that you''ll just get the result of calling to_s on
each of
> your array elements, which is unlikely to be useful and also invalid
> html since what it outputs is something like #<SomeObject:
> 0x12345678> . It is up to you to produce some meaningful textual
> output for your array elements (eg <%= h some_array.inspect %> but
> even that is pretty crude)
>
> Fred
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On Feb 21, 11:11 am, Cyrus Dev <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> thanks fred > > but in o/p > > when we use find method and print that object it shows like that > > [#, #, #, #]That''s probably because of exactly what I said. the default to_s/ inspect produces output like #<ClassName: ...> but that''s not legal html so it displays as just #. If you want something useful to be displayed that''s up to you, eg <%= records.collect {|r| r.name}.join ('', '') %> (assuming what you wanted to display was the name attribute of the records. If you want to display all the attributes you could probably just call inspect on the attributes property of each of your records. Fred> > but when i modify same array with some operations > > i got array like this > > [{"1"=>"75225", "2"=>"Sat"},{"1"=>"75225", "2"=>"Sat"}] > > now can I convert this as like above like active record type of array ? > > > > Frederick Cheung wrote: > > On Feb 21, 11:00 am, Cyrus Dev <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> > > wrote: > >> which contains array of hashes > > >> when we write simple find method of any tables it returns > > >> [#, #, #, #] in this way > > > Sounds like your view just contains <%= some_array %> > > > Which means that you''ll just get the result of calling to_s on each of > > your array elements, which is unlikely to be useful and also invalid > > html since what it outputs is something like #<SomeObject: > > 0x12345678> . It is up to you to produce some meaningful textual > > output for your array elements (eg <%= h some_array.inspect %> but > > even that is pretty crude) > > > Fred > > -- > Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---
No fred
its not something like that this 2 types of array are total different it
seems like that
becuase if you write
@users = User.find(:all)
then in view file you can directly use that array with each loop
@users.each do |c|
c.title
end
but in my case
in view file i write same code like for @users but I am getting errr
like
undefined title
when I use this array
[#,#] [active record array ] it works in view file
but after modifying this array with
[{zip=>''d'',{po => ''d''}}]
then we can''t use that directly in view it should some thing i have to
write in file file liek
@users.each do |c|
c.title it will not work
end
instead of that i have to write @users[0].title
got it ? any solution ?
Frederick Cheung wrote:> On Feb 21, 11:11�am, Cyrus Dev
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
> wrote:
>> thanks fred
>>
>> but in o/p
>>
>> when we use find method and print that object �it shows like that
>>
>> [#, #, #, #]
>
> That''s probably because of exactly what I said. the default to_s/
> inspect produces output like #<ClassName: ...> but that''s
not legal
> html so it displays as just #. If you want something useful to be
> displayed that''s up to you, eg <%= records.collect {|r|
r.name}.join
> ('', '') %> (assuming what you wanted to display was the
name attribute
> of the records. If you want to display all the attributes you could
> probably just call inspect on the attributes property of each of your
> records.
>
> Fred
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On Feb 21, 12:06 pm, Cyrus Dev <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> > but after modifying this array with > [{zip=>''d'',{po => ''d''}}] > > then we can''t use that directly in view it should some thing i have to > write in file file liekWell you''ve changed your array of active record objects into a hash or an array of hashes - you just need to access that appropriately (exactly how will depend on what you did to your original array). Fred> > @users.each do |c| > c.title it will not work > end > > instead of that i have to write @users[0].title > > got it ? any solution ? > > > > Frederick Cheung wrote: > > On Feb 21, 11:11 am, Cyrus Dev <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> > > wrote: > >> thanks fred > > >> but in o/p > > >> when we use find method and print that object it shows like that > > >> [#, #, #, #] > > > That''s probably because of exactly what I said. the default to_s/ > > inspect produces output like #<ClassName: ...> but that''s not legal > > html so it displays as just #. If you want something useful to be > > displayed that''s up to you, eg <%= records.collect {|r| r.name}.join > > ('', '') %> (assuming what you wanted to display was the name attribute > > of the records. If you want to display all the attributes you could > > probably just call inspect on the attributes property of each of your > > records. > > > Fred > > -- > Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---
I think there is some confusion in this conversation
first of all: When you do that
@users = User.find(:all)
@users will be one array of users objects, and if user object answer
to the method name you can do:
@users.each do |u| puts u.name end
and you will get all users names,
But if you have somthing like this:
@users = [{:name => "john"}, {:name => "miguel"}]
you cannot do :
@users.each do |u| puts u.name end
because {:name => "jonh"} is an hash and it do not respond to
method
name, although you can get the name if you do this {:name =>
"jonh"}
[:name]
So summarizing it:
a = User.new :name => "foo"
a.name # WORKS
a = {:name => "foo"}
a.name # DO NOT WORK
a[:name] # WORK
I hope that helps you
On Feb 21, 12:06 pm, Cyrus Dev
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:> No fred
>
> its not something like that this 2 types of array are total different it
> seems like that
>
> becuase if you write
>
> @users = User.find(:all)
>
> then in view file you can directly use that array with each loop
>
> @users.each do |c|
> c.title
> end
>
> but in my case
>
> in view file i write same code like for @users but I am getting errr
> like
>
> undefined title
>
> when I use this array
>
> [#,#] [active record array ] it works in view file
>
> but after modifying this array with
> [{zip=>''d'',{po => ''d''}}]
>
> then we can''t use that directly in view it should some thing i
have to
> write in file file liek
>
> @users.each do |c|
> c.title it will not work
> end
>
> instead of that i have to write @users[0].title
>
> got it ? any solution ?
>
>
>
> Frederick Cheung wrote:
> > On Feb 21, 11:11 am, Cyrus Dev
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
> > wrote:
> >> thanks fred
>
> >> but in o/p
>
> >> when we use find method and print that object it shows like that
>
> >> [#, #, #, #]
>
> > That''s probably because of exactly what I said. the default
to_s/
> > inspect produces output like #<ClassName: ...> but
that''s not legal
> > html so it displays as just #. If you want something useful to be
> > displayed that''s up to you, eg <%= records.collect {|r|
r.name}.join
> > ('', '') %> (assuming what you wanted to display
was the name attribute
> > of the records. If you want to display all the attributes you could
> > probably just call inspect on the attributes property of each of your
> > records.
>
> > Fred
>
> --
> Posted viahttp://www.ruby-forum.com/.
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Yes fred I modify that array and hash that is my question.. Can I do that array like original like activ record array ? using any ruby or rails functions ? thanks Frederick Cheung wrote:> On Feb 21, 12:06�pm, Cyrus Dev <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> > wrote: >> >> but after modifying this array with >> [{zip=>''d'',{po => ''d''}}] >> >> then we can''t use that directly in view it should some thing i have to >> write in file file liek > > Well you''ve changed your array of active record objects into a hash or > an array of hashes - you just need to access that appropriately > (exactly how will depend on what you did to your original array). > > Fred-- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---
On 23 Feb 2009, at 08:48, Cyrus Dev wrote:> > > Yes fred > > I modify that array and hash that is my question.. > > Can I do that array like original like activ record array ? using any > ruby or rails functions ? >Only if you create new objects from those hashes. Fred> thanks > > > Frederick Cheung wrote: >> On Feb 21, 12:06�pm, Cyrus Dev <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> >> wrote: >>> >>> but after modifying this array with >>> [{zip=>''d'',{po => ''d''}}] >>> >>> then we can''t use that directly in view it should some thing i >>> have to >>> write in file file liek >> >> Well you''ve changed your array of active record objects into a hash >> or >> an array of hashes - you just need to access that appropriately >> (exactly how will depend on what you did to your original array). >> >> Fred > > -- > Posted via http://www.ruby-forum.com/. > > >--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---
How can we create new objects from hashes ? thanks .. Frederick Cheung wrote:> On 23 Feb 2009, at 08:48, Cyrus Dev wrote: > >> >> >> Yes fred >> >> I modify that array and hash that is my question.. >> >> Can I do that array like original like activ record array ? using any >> ruby or rails functions ? >> > Only if you create new objects from those hashes. > > Fred-- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en -~----------~----~----~----~------~----~------~--~---
On Feb 24, 3:52 am, Cyrus Dev <rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org> wrote:> How can we create new objects from hashes ? >depends what kind of object you want to create. You can''t call user.foo unless the user object has a foo method, and hashes don''t. So create an instance of something that does have a foo method. Exactly what you create and how you use your hash when creating it is entirely up to you. Fred> thanks .. > > Frederick Cheung wrote: > > On 23 Feb 2009, at 08:48, Cyrus Dev wrote: > > >> Yes fred > > >> I modify that array and hash that is my question.. > > >> Can I do that array like original like activ record array ? using any > >> ruby or rails functions ? > > > Only if you create new objects from those hashes. > > > Fred > > -- > Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~ 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-/JYPxA39Uh5TLH3MbocFFw@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 -~----------~----~----~----~------~----~------~--~---