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Paul Bergstrom

2011-Feb-15 16:46 UTC

Hash to list fails

Why does this output the same hash again (like hash.inspect) and not
each key as I want?

@myhash.each { |k,v| "<li>" + k + "</li>" }

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Colin Law

2011-Feb-15 16:57 UTC

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Re: Hash to list fails

On 15 February 2011 16:46, Paul Bergstrom
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> Why does this output the same hash again (like hash.inspect) and not
> each key as I want?
>
> @myhash.each { |k,v| "<li>" + k + "</li>" }
Because it is showing the return value of the method each, not what
you are doing in the block.  You need to build up a string in the
block which is the concatenation of your li strings.
Crudely, something like
str = ""
@myhash.each { |k,v| str += "<li>#{k}</li>" }

Colin

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kedar mhaswade

2011-Feb-15 17:12 UTC

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Re: Hash to list fails

Or since only keys are needed, use each_key iterator.

Also, I think ri should say that the "method" each "returns"
the same Hash
on which you called the method.

-Kedar

On Tue, Feb 15, 2011 at 8:57 AM, Colin Law
<clanlaw-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
> On 15 February 2011 16:46, Paul Bergstrom
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
> > Why does this output the same hash again (like hash.inspect) and not
> > each key as I want?
> >
> > @myhash.each { |k,v| "<li>" + k +
"</li>" }
>
> Because it is showing the return value of the method each, not what
> you are doing in the block.  You need to build up a string in the
> block which is the concatenation of your li strings.
> Crudely, something like
> str = ""
> @myhash.each { |k,v| str += "<li>#{k}</li>" }
>
> Colin
>
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Paul Bergstrom

2011-Feb-15 18:26 UTC

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Re: Hash to list fails

Kedar Mhaswade wrote in post #981823:> Or since only keys are needed, use each_key iterator.
>
> Also, I think ri should say that the "method" each
"returns" the same
> Hash
> on which you called the method.
>
> -Kedar
I actually need both.

Hmm. This should output a string in view but it doesn''t:

<% h = { "a" => 100, "b" => 200 } %>
<%= h.each {|key, value| puts "#{key} is #{value}" } %>

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kedar mhaswade

2011-Feb-15 19:11 UTC

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Re: Re: Hash to list fails

On Tue, Feb 15, 2011 at 10:26 AM, Paul Bergstrom
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>wrote:
> Kedar Mhaswade wrote in post #981823:
> > Or since only keys are needed, use each_key iterator.
> >
> > Also, I think ri should say that the "method" each
"returns" the same
> > Hash
> > on which you called the method.
> >
> > -Kedar
>
> I actually need both.
>
> Sure, each or each_pair.
> Hmm. This should output a string in view but it doesn''t:
>
> <% h = { "a" => 100, "b" => 200 } %>
>First: Consider using Symbols (not required, but ubiquitous) as that is the
Railism ;)

> <%= h.each {|key, value| puts "#{key} is #{value}" } %>
>That''s perhaps because you''re dealing with output stream, (and
not view of a
controller) of your Rails server when you use puts.
You should collate the response in a variable like Colin showed and just do:
<%=str %> which puts the contents of the string in the view.

HTH,
-Kedar
>
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Paul Bergstrom

2011-Feb-15 19:20 UTC

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Re: Hash to list fails

It works as a ruby script. But not in Rails. Strange.

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Paul Bergstrom

2011-Feb-15 19:22 UTC

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Re: Hash to list fails

Colin Law wrote in post #981819:> On 15 February 2011 16:46, Paul Bergstrom
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org> wrote:
>> Why does this output the same hash again (like hash.inspect) and not
>> each key as I want?
>>
>> @myhash.each { |k,v| "<li>" + k +
"</li>" }
>
> Because it is showing the return value of the method each, not what
> you are doing in the block.  You need to build up a string in the
> block which is the concatenation of your li strings.
> Crudely, something like
> str = ""
> @myhash.each { |k,v| str += "<li>#{k}</li>" }
>
> Colin
Thanks. I didn''t see your respons until now. :-)

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kedar mhaswade

2011-Feb-15 19:32 UTC

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Re: Re: Hash to list fails

On Tue, Feb 15, 2011 at 11:20 AM, Paul Bergstrom
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>wrote:
> It works as a ruby script. But not in Rails. Strange.
>Or rather it works in Rails too. But does not do what you want. No wait, but
it does do what you told it to do :-)

-Kedar
>
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Michael Pavling

2011-Feb-15 19:54 UTC

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Re: Re: Hash to list fails

On 15 February 2011 18:26, Paul Bergstrom
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> Hmm. This should output a string in view but it doesn''t:
>
> <% h = { "a" => 100, "b" => 200 } %>
> <%= h.each {|key, value| puts "#{key} is #{value}" } %>
It certainly won''t do what you think it should....

As has already been pointed out, the .each method on a hash returns
the original hash, so your code is going to put some text onto the
console (not the same as rendering in the browser) and then render the
original hash in the browser.

You *probably* want something more like:
  <% test_hash = { "a" => 100, "b" => 200 } %>
  <% test_hash.each do |key, value| %>
    <%=puts "#{h key} is #{h value}" %>
  <% end%>

Or use .inject to collect up all the return values of the block and
render that...

Check out the api for lots more handy Hash/Enumerable methods, and
*exactly* how they should work. I can heartily recommend playing with
them in a console window to get to grips with how they work.

http://ruby-doc.org/core/classes/Hash.html
http://ruby-doc.org/core/classes/Enumerable.html

PS "h" is a bad name for a variable, and not idiomatic. It would
replace the "h" shortcut for html encoding (assuming Rails 2.x) and
isn''t very descriptive of it''s intention

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Michael Pavling

2011-Feb-15 19:55 UTC

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Re: Re: Hash to list fails

On 15 February 2011 19:54, Michael Pavling
<pavling-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> You *probably* want something more like:
>    <%=puts "#{h key} is #{h value}" %>
Of course... without the "puts" :-/

  <%= "#{h key} is #{h value}" %>

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Colin Law

2011-Feb-15 20:42 UTC

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Re: Re: Hash to list fails

On 15 February 2011 18:26, Paul Bergstrom
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> Kedar Mhaswade wrote in post #981823:
>> Or since only keys are needed, use each_key iterator.
>>
>> Also, I think ri should say that the "method" each
"returns" the same
>> Hash
>> on which you called the method.
>>
>> -Kedar
>
> I actually need both.
>
> Hmm. This should output a string in view but it doesn''t:
>
> <% h = { "a" => 100, "b" => 200 } %>
> <%= h.each {|key, value| puts "#{key} is #{value}" } %>
Just in case it is not clear from the other replies, when you execute
puts when running as a rails app the output will go to the server
terminal window, that is the terminal where you typed rails server.
If you look there you will probably see it mixed up with all the
server stuff.

Colin

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Jim Ruther Nill

2011-Feb-16 00:19 UTC

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Re: Hash to list fails

can''t you use collect? and then join the result?

@myhash.each {|k,v| "<li>#{k} is #{v}</li>"}.join

On Wed, Feb 16, 2011 at 12:46 AM, Paul Bergstrom
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>wrote:
> Why does this output the same hash again (like hash.inspect) and not
> each key as I want?
>
> @myhash.each { |k,v| "<li>" + k + "</li>" }
>
> --
> Posted via http://www.ruby-forum.com/.
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>

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Jim Ruther Nill

2011-Feb-16 00:20 UTC

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Re: Hash to list fails

ooops. sorry. should be

@myhash.collect {|k,v| "<li>#{k} is #{v}</li>"}.join

On Wed, Feb 16, 2011 at 8:19 AM, Jim Ruther Nill
<jvnill-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> can''t you use collect? and then join the result?
>
> @myhash.each {|k,v| "<li>#{k} is #{v}</li>"}.join
>
>
> On Wed, Feb 16, 2011 at 12:46 AM, Paul Bergstrom
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>wrote:
>
>> Why does this output the same hash again (like hash.inspect) and not
>> each key as I want?
>>
>> @myhash.each { |k,v| "<li>" + k +
"</li>" }
>>
>> --
>> Posted via http://www.ruby-forum.com/.
>>
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Groups
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>>
>>
>
>
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>


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Rails - Feb 2011 - Hash to list fails

Hash to list fails

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