AttributeError: 'Undefined' object has no attribute 'meta'

[Julien Vallet]

Hi,

I have trouble with the replacement of an old theme.

When building under a new theme (canterville), I get a

__M_writer(str(post.meta('banner')))
AttributeError: 'Undefined' object has no attribute 'meta'

########################################
render_galleries:output/galleries/index.html <stdout>:
 

Maybe its because I misused conf.py ?

GLOBAL_CONTEXT = {
   "BANNER_URL": '/assets/img/oeil.jpg',

}

Yet I've been careful with the Global_context location...

Or in my template ?

<div class="site-wrapper">
    % if 'main_index' in pagekind:
    <header class="main-header" style="background-image: url(${BANNER_URL})">
    % else:
    <header class="main-header" style="background-image: url(${post.meta('banner')})">
    % else:
    <header class="main-header post-head no-cover">
    % endif
 

Can you help me ?

[Roberto Alsina]

You probably need to check if the page you are rendering has a post or not. What template is this?

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[Julien Vallet]

It has three posts and it's the index template.

[Roberto Alsina]

Ok, the index template has no post, so you will need to make that conditional on post being there.

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[Julien Vallet]

Sorry but what does it mean ?

[Julien Vallet]

Sorry, my english is too bad. How can I do that ?

[Julien Vallet]

Yet there is a block for articles no ?

<div class="postindex">
% for post in posts:


<article class="post post">
    <header class="post-header">
        <h2 class="post-title"><a href="${post.permalink()}">${post.title()|h}</a></h2>
    </header>
    %if index_teasers:
    <section class="post-excerpt">
    ${post.text(teaser_only=True)}
    %else:
    <section class="post-excerpt">
    ${post.text(teaser_only=False)}
    %endif
    </section>
    <footer class="post-meta">
            % if author_pages_generated:
                <a href="${_link('author', post.author())}">${post.author()|h}</a>
            % else:
                ${post.author()|h}
            % endif

        on
            % for tag in post.tags:
                <a href="link://tag/${tag}">#${tag}</a>,
            % endfor

        <time class="post-date" datetime="${post.formatted_date('webiso')}">
            ${post.formatted_date(date_format)|h}
        </time>
    </footer>
</article>

[Roberto Alsina]

The template has no "post", you only have it inside that loop, after the line

% for post in posts:

I am guessing the call to post.meta that's failing is outside that.

Trying to explain how to fix that without context is difficult, but you just can't use post anywhere outside that loop.

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[Julien Vallet]

Can I send you the context ? What would you need ? I'm just at the end of the rope

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[Roberto Alsina]

On Wed, May 13, 2020 at 7:30 AM Julien Vallet <j.su...@wanadoo.fr> wrote:

Can I send you the context ? What would you need ? I'm just at the end of the rope

Is your site's source code somewhere I can see it?

Or just make a zip and email it to me.

[Roberto Alsina]

I got the zip you sent me.

* I moved aside the copy of canterville you included and downloaded the original

* Re-added as empty the galleries you removed before sending

And it built just fine.

* Put back your version of canterville:

[2020-05-21 06:12:17] ERROR: Nikola: File "/home/ralsina/Downloads/x/nikola_test/cache/.mako.tmp/base.tmpl.py", line 88
    else:
    ^
SyntaxError: invalid syntax

So, the problem seems to either have been fixed in canterville after you installed it, or was introduced when you edited it.

These are the relevant differences:

-    % if 'main_index' in pagekind and BANNER_URL:
+    % if 'main_index' in pagekind and BANNER_URL :

     <header class="main-header" style="background-image: url(${BANNER_URL})">

-    % else:
+    % elif 'post_page' in pagekind and post.meta('banner'):

     <header class="main-header" style="background-image: url(${post.meta('banner')})">
     % else:
     <header class="main-header post-head no-cover">

You can just get the original base.tmpl from canterville and replace yours and it will probably build just fine:

https://github.com/getnikola/nikola-themes/blob/master/v8/canterville/templates/base.tmpl

[Julien Vallet]

It worked just fine thanks ! I had changed the base.tmpl trying to impose the banner.
Now the site works well, but I'm still in struggle with the metadata, yet I think I have set the global context at the right place and tried numerous possibilities to set the pagekind to main_index and BANNER_URL.
Did the banner opened when you build it ?

Le mercredi 13 mai 2020 10:59:50 UTC+2, Julien Vallet a écrit :

[Roberto Alsina]

I did not check anything other than that it built.

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[Julien Vallet]

Yet my output does not compile it, there is just the logo and the menu, and the header is "post-head no-cover".

Le mercredi 13 mai 2020 10:59:50 UTC+2, Julien Vallet a écrit :

[moi]

Thanks ! It works just fine. But did the banner appears to you ? 

I modified the global context in the conf.py but it doesn't seem to work for me. 

I surely checked the google discuss about the same problem... 

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