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POHow to handle nested context?
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  1. POHow to handle nested context?
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    copied!<p>I wanted to use nested dictionaries in <a href="http://mustache.github.com" rel="nofollow">Mustache</a>, section <strong>Non-False Values</strong> in <a href="http://mustache.github.com/mustache.5.html" rel="nofollow">Mustache manual</a> suggests it's possible and presents the following example:</p> <p><strong>Template:</strong></p> <pre class="lang-js prettyprint-override"><code>{{#person?}} Hi {{name}}! {{/person?}} </code></pre> <p><strong>Hash:</strong></p> <pre class="lang-js prettyprint-override"><code>{ "person?": { "name": "Jon" } } </code></pre> <p><strong>Output:</strong></p> <pre><code>Hi Jon! </code></pre> <p>I tried to run above example in <a href="http://mustache.github.com/#demo" rel="nofollow">online demo</a> and I got:</p> <pre><code>Hi ! </code></pre> <p>I also tried <a href="https://github.com/defunkt/pystache" rel="nofollow">pystache</a> (pystache 0.3.1, Python 2.7.2):</p> <pre class="lang-python prettyprint-override"><code>import pystache tmpl = """ {{#person}} Hi {{name}}! {{/person}} """ dct = { "person": { "name": "Jon" } } print(pystache.render(tmpl, dct)) </code></pre> <p>And I got an error:</p> <pre><code>Traceback (most recent call last): File "test2.py", line 13, in &lt;module&gt; print(pystache.render(tmpl, dct)) File "c:\Python27\lib\site-packages\pystache\__init__.py", line 7, in render return Template(template, context).render() File "c:\Python27\lib\site-packages\pystache\template.py", line 42, in render template = self.render_sections(template, context) File "c:\Python27\lib\site-packages\pystache\template.py", line 78, in render_sections insides.append(self.render(inner, item)) File "c:\Python27\lib\site-packages\pystache\template.py", line 43, in render result = self.render_tags(template, context) File "c:\Python27\lib\site-packages\pystache\template.py", line 97, in render_tags replacement = func(self, tag_name, context) File "c:\Python27\lib\site-packages\pystache\template.py", line 105, in render_tag raw = context.get(tag_name, '') AttributeError: 'str' object has no attribute 'get' </code></pre> <p>I had no problems with lists, so structure like below worked fine:</p> <pre class="lang-js prettyprint-override"><code>{ "person?": [{ "name": "Jon" }] } </code></pre> <p>I can make a work-around by input dict preprocessing (flattening or changing dictionaries to lists), but why it doesn't work? Am I doing something wrong?</p> <hr> <h2>Solution of pystache problem</h2> <p>Version of pystache located in <a href="http://pypi.python.org" rel="nofollow">PyPI</a> is really old (from May 2010) and that's the problem. Version from <a href="https://github.com/defunkt/pystache" rel="nofollow">GitHub</a> is much newer (and problem with nested dictionaries doesn't show up).</p>
 

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