Why is it that...
{code}>> myarray = ["one"]
=> ["one"]>> myarray.to_xml
RuntimeError: Not all elements respond to to_xml
from /foo/vendor/rails/activerecord/lib/../../activesupport/lib/
active_support/core_ext/array/conversions.rb:62:in `to_xml''
from (irb):94>>
{code}
... however ...
{code}>> myarray2 = [{:one => "onevalue"}]
=> [{:one=>"onevalue"}]>> myarray2.to_xml
=> "<?xml version=\"1.0\"
encoding=\"UTF-8\"?>\n<records type=\"array
\">\n <record>\n <one>onevalue</one>\n
</record>\n</records>\n">>
{code}
Is there a way I can convert an array to xml without having to wrap
each element in a hash???
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What do you want the resulting XML to look like? Usually XML has name/
value format.
You can do this:
class Symbol
def to_xml
{self => self.to_s}.to_xml
end
end
and then you can call :hello.to_xml
=> <hello>hello</hello>
That''s a little dangerous, though, and it may turn out that you should
rethink the XML schema, and use hashes in general.
On Oct 6, 6:30 pm, Sam
<ramsden....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Why is it that...
>
> {code}>> myarray = ["one"]
> => ["one"]
> >> myarray.to_xml
>
> RuntimeError: Not all elements respond to to_xml
> from /foo/vendor/rails/activerecord/lib/../../activesupport/lib/
> active_support/core_ext/array/conversions.rb:62:in `to_xml''
> from (irb):94
>
> {code}
>
> ... however ...
>
> {code}>> myarray2 = [{:one => "onevalue"}]
>
> => [{:one=>"onevalue"}]>> myarray2.to_xml
>
> => "<?xml version=\"1.0\"
encoding=\"UTF-8\"?>\n<records type=\"array
> \">\n <record>\n <one>onevalue</one>\n
</record>\n</records>\n"
>
> {code}
>
> Is there a way I can convert an array to xml without having to wrap
> each element in a hash???
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On 7 Oct 2008, at 02:30, Sam wrote:> > Why is it that... > > {code} >>> myarray = ["one"] > => ["one"] >>> myarray.to_xml > RuntimeError: Not all elements respond to to_xml > from /foo/vendor/rails/activerecord/lib/../../activesupport/lib/ > active_support/core_ext/array/conversions.rb:62:in `to_xml'' > from (irb):94 >>> > {code} > > ... however ... > > {code} >>> myarray2 = [{:one => "onevalue"}] > => [{:one=>"onevalue"}] >>> myarray2.to_xml > => "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<records type=\"array > \">\n <record>\n <one>onevalue</one>\n </record>\n</records>\n" >>>In a nutshell, strings don''t have a to_xml method, but hashes do.> {code} > > Is there a way I can convert an array to xml without having to wrap > each element in a hash??? >What do you want the output to look like ? 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-/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 -~----------~----~----~----~------~----~------~--~---
I''m wanting something like...
<errors>
<error>foo</error>
<error>bar</error>
</errors>
I find it really interesting that a Rails controller will accept xml
like...
<process-codes>
<code>one</code>
<code>two</code>
</process-codes>
.. and transform it into a hash..
{ :process_codes => { :code => [ "one", "two" ] } }
... but will not go back the other way when I want to convey errors...
{ :errors => { :error => [ "foo", "bar" ] } }
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The standard thing to do is put classes in there instead of strings,
so each error would be an instance of class Error, which would respond
to to_xml with <error>foo</error> or whatever. See, for example,
Pat
Maddox''s Blog:
http://evang.eli.st/blog/2007/2/22/my-rails-gotcha-custom-to_xml-in-a-hash-or-array
If you are worried about reversibility, you can change active_support
\core_ext\array\conversions so that the to_xml method looks like this
at the top:
options[:root] ||= all? { |e| e.is_a?(first.class) &&
first.class.to_s != "Hash" } ? first.class.to_s.underscore.pluralize :
"records"
map!{|e| (e.class.name == "String") ? {options[:root].to_sym
=> e} : e}
raise "Not all elements respond to to_xml" unless all? { |e|
e.respond_to? :to_xml }
options[:children] ||= options[:root].singularize
options[:indent] ||= 2
options[:builder] ||= Builder::XmlMarkup.new(:indent =>
options[:indent])
The XML you get back isn''t pretty, but it doesn''t crash:
<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<hash>
<errors>
<error type=\"array\">
<error>
<error>foo</error>
</error>
<error>
<error>bar</error>
</error>
</error>
</errors>
</hash>
Cleaning it up more than this might be a bit tricky. If this is
something a lot of people would like, I''d look at it some more, but I
think it''s pretty unusual, and it''s usually easier to use
objects.
-Michael
On Oct 6, 7:54 pm, Sam
<ramsden....-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> I''m wanting something like...
>
> <errors>
> <error>foo</error>
> <error>bar</error>
> </errors>
>
> I find it really interesting that a Rails controller will accept xml
> like...
>
> <process-codes>
> <code>one</code>
> <code>two</code>
> </process-codes>
>
> .. and transform it into a hash..
>
> { :process_codes => { :code => [ "one", "two" ] }
}
>
> ... but will not go back the other way when I want to convey errors...
>
> { :errors => { :error => [ "foo", "bar" ] } }
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Thanks Michael.
I''ve taken the easy (and hacky) way out by using an
ActiveRecord::Errors object which is transformed implements to_xml
quite nicely.
The hacky bit is that I''m not always adding an error that coincides
with an attribute of the model I''m exploiting .. eg,
errors.add( :code, "#{code} is not found" )
..when my model object doesn''t actually have a "code"
attribute.
Also... under some scenarios I may not have a model instance at all
but need to create one in order to gain access to the to_xml friendly
Errors object by doing something like...
errors = Player.new.errors
... which is of course hacky, but more readily thrown together than
implementing a custom errors class or modifying the conversions.rb
The Errors object is also nice because it allows multiple errors with
the same key...
errors.add( :code, "#{code} is not found" )
errors.add( :code, "#{code} has already been processed" )
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