From: David Vallner <david@...>
Date: 2006-12-04T03:26:03+09:00
Subject: Re: Intermittant problem with Hpricot

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Allison Newman wrote:
> I've run into a wierd problem with the Hpricot gem.  I don't know if
> this is a problem with gems in general on my system, or if it's specifi=
c
> to Hpricot, so I'm posting here.
>=20
> Basically I have code as follows:
> require 'rubygems'
> require 'net/http'
> require 'uri'
> require_gem 'hpricot'
>=20
> class Page
>   def some_function(html_text)
>     doc =3D Hpricot(html_text)
>     doc.search("/html/body//img").each do |img|
>        logger.debug("=3D=3D Found an image: #{img} =3D=3D")
>        src =3D img[/src=3D"/]
>        logger.debug("src =3D #{src}")
>      end
>   end
> end
>=20
>=20
> When the function is called, sometimes I get a message saying that
> function Hpricot does not exist for the object of type Page.  this
> continues for the entire programming session.
>=20
> But sometimes, when I sit down to work on the project, the code works!
> It continues working until I restart the Rails server (this is a Rails
> project running on MacOSX).
>=20
> Does anyone have any idea what might be causing this problem, and how t=
o
> correct it?
>=20
> Alli
>=20

This might or might not be related, but I think there was some change to
the semantics of require_gem lately (appeared in a post or thread a week
or two ago?), or HPricot might have been changed not to load any files
when the gem is loaded.

Either way, (I think) you should just use #require, not #require_gem and
directly require files inside the Hpricot gem - Rubygems is intended to
be as transparent to use as possible, and at least personally I prefer
code agnostic to how a certain library might be packaged on the given
system.

Try using require 'hpricot' instead or require_gem 'hpricot' and see if
that helps?

Also, Rails has a hard dependency on rubygems, so you don't need to
require those in Rails code.

David Vallner


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