On Friday, May 24, 2013 8:53:38 AM UTC-4, A B wrote:
>
> Whatever I do I get a response page rendered like this:
>
>
> <https://lh3.googleusercontent.com/-G9KpqL6QGKE/UZ9afeLuFpI/AAAAAAAAABk/r5rITlX-kzc/s1600/rails_render.png>
> Every page is rendered with blank spaces. Even if I put HTML and ERB tags
> together inline:
> *
> *
> *
> *
> *## Not together inline, blank spaces are like on the picture above:*
> *<div>*
>
> *<%= @foo %>*
>
> *</div>*
>
>
> *## Together inline, see the result lower:*
> *<div><%= @foo %></div>*
>
>
> *## Result from t**ogether inline. **Blank spaces exists either but now
> look like this:*
> *<div class="foo">*
>
> *""* *## see the difference? Two double quotes together, not with a
> space in-between. But anyway it is rendered!*
>
> *</div> *
>
> What I've learned so far:
>
> The text from Rails
> guide<http://edgeguides.rubyonrails.org/configuring.html#configuring-action-view>
> :
>
> *config.action_view.erb_trim_mode* gives the trim mode to be used by ERB.
>> It defaults to '-'. See the ERB documentation for more information.
>
>
>
> But at the same time they
> say<http://www.kuwata-lab.com/erubis/users-guide.05.html>that the Erubis is
> the default template engine in Rails, not ERB:
>
> NOTICE: Rails 3 adopts Erubis as default default engine. You don't need to
>> do anything at all when using Rails 3. This section is for Rails 2.
>
>
>
> And here is a code from *
> gems\actionpack-3.2.13\lib\action_view\template\handlers\erb.rb:*
>
> # Specify trim mode for the ERB compiler. Defaults to '-'.
> # See ERB documentation for suitable values.
> class_attribute :erb_trim_mode
> self.erb_trim_mode = '-' ### yes, trim mode is set by dafault. But it is
> nothing for Erubis.
>
> # Default implementation used.
> class_attribute :erb_implementation
> self.erb_implementation = Erubis ### yes, Erubis is instead of ERB
>
> self.class.erb_implementation.new(
> erb,
> :escape => (self.class.escape_whitelist.include? template.mime_type),
> :trim => (self.class.erb_trim_mode == "-") ### so :trim is true, just
> because self.erb_trim_mode = '-'. That's all.
>
> ).src`
>
>
> From official Erubis docs:
>
> Erubis deletes spaces around '<% %>' automatically, while it leaves spaces
>> around '<%= %>'.
>> If you want leave spaces around '<% %>', add command-line property
>> '--trim=false'.
>> Or add option :trim=>false to Erubis::Eruby.new().
>
>
>
> So it is obvious that :trim => (self.class.erb_trim_mode == "-") will
> never remove spaces around <%= %>. Because there is no option in Erubis
> for it. And this is exactly seen on the picture above.
>
> This line self.erb_implementation = Erubis informs that Rails implements
> Erubis instead of ERB.
>
> But as written above the only trim mode Erubis supports is around <% %> ,
> just pass true or false only.
>
> So any experiments with true ERB
> options<http://ruby-doc.org/stdlib-2.0/libdoc/erb/rdoc/ERB.html#method-c-new>(
> *< % > -)* yields nothing. Because Erubis just doesn't support them.
>
> My question: How to get rid of those blank spaces without switching to
> Slim, Haml, etc?
>
> Why Rails say in their guide *See the ERB documentation for more
> information* if it means nothing for default Erubis?
>
I'm either reading this wrong, or something isn't making sense. If I read
this correctly, you have the following in a html.erb file:
<div><%= @foo %></div>
and it is rendering the following html:
<div class="foo">
""
</div>
If that's correct, there are a couple of things. First, the rendering
procedures would not have defined a class for the div tag, either that's a
misprint, or you must have had it in the template code.
Second, the <%= ... %> does not insert any spaces or new line characters on
its own, nor does it eliminate any. It evaluates the expression and
returns it. For example, if @foo is a string with the value 'aaa', the
template code above would return:
<div>aaa</div>
In the code:
<div>
<%= @foo %>
</div>
it would render:
<div>
aaa
</div>
If I'm reading your post correctly, the value passed by @foo must include
newline characters and the quotation marks. You are correct that erubis
strips spaces and newline characters from <% ... %> statements and the
config.action_view.erb_trim_mode no longer really does anything.
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