Dexterity - TAL Expression to Display Images from Blobstorage

Hello,

I'm working on a Plone add-on for a project site where contributors
could upload their extensions and templates. The product contains three
content types:
- eupcenter
- eupproject
- euprelease.

I created the add-on using Dexterity content types (grok style) with
view-templates for each content type. The views are made with TAL
expressions.

I created a catalog query with a form and a list of direct catalog query
for each category.

There is also a results area that currently works with the category queries.

The category queries are coded in TAL expression like this (in the
eupcenter-view):



           <div class="" id="bycategory">

            <h2 tal:condition="here/product_title" i18n:translate="">
                Browse <span tal:content="context/product_title"
i18n:name="product_title" /> by Category
            </h2>
            <h2 tal:condition="not:context/product_title"
i18n:translate="">Browse Extensions by Category</h2>

            <ol id="add-on-categories">
                <tal:categories repeat="category
context/available_category">

                <li><a href=""
                            tal:attributes="href
string:${context/absolute_url}?getCategories=${category}&getCompatibility=any"
                            tal:content="category"
                            ><tal:comment replace="nothing">Extension
releases</tal:comment></a></li>
                </tal:categories>
            </ol>

        </div>


The results  area is currently coded in the template like this (in the
eupcenter-view):

              <div class="" id="categories"
                            tal:define="results
python:view.get_products(currentCategory, currentVersion, sort_on,
SearchableText);
                                        Batch
python:modules['Products.CMFPlone'].Batch;
                                        b_size python:10;b_start
python:0;b_start request/b_start | b_start;
                                        desc_length
site_properties/search_results_description_length;
                                        desc_ellipsis
site_properties/ellipsis;">

                        (...)
                        <tal:results
                                     define="batch python:Batch(results,
b_size, int(b_start), orphan=1);">
                            <ul class="downloads">
                                <li tal:repeat="result batch">
                                    <tal:entry
                                            define="project
result/getObject;
                                                    url result/getURL;
                                                    projectURL
project/absolute_url;
                                                    result_type
result/portal_type;
                                                    zoomid  
python:project.id.replace('.', '_');
                                                    screenshot  
project/getScreenshot | nothing">
                                        <h3 style="border-top: none">
                            <a href=""
                                tal:attributes="href projectURL;"
                                tal:content="result/pretty_title_or_id">
                            </a>
                        </h3>
                            <span class="project-thumb">

                            <img
tal:condition="project/project_logo|nothing"
                                tal:replace="structure
project/project_logo" />

                            <img
tal:condition="project/project_logo|nothing" tal:attributes="src
string:${project/absolute_url}/@@download/project/project_logo          
/${project/project_logo/filename};
                         height picture/_height | nothing;
                         width picture/_width | nothing;"
            />
</span>
(...)

------------- end of TAL snipped --------------

I want to get the image from the field "project_logo = NamedBlobImage"
(from eupproject.py) with the TAL expression. But the image could not be
loaded because the expression was not replaced with the URL to the
project or the file.

I could show the image with a similar TAL expression on the
eupproject-view. But it is currently not possible to scale the image
down. Would be nice to get a hint, how to fix that, too.

The source code of the add-on is hosted at:
https://github.com/tdf/tdf.extensionsuploadcenter

Thanks for any help in advance
Andreas

-- 
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