Corrupt document when passing a context with nested objects that have the word `pop` in the keys

[maarten-betman]

Describe the bug

When passing a context object that has a nested object with word pop as on the keys, the render goes fine, but when trying to open the word document you are told the document is corrupted.

To Reproduce

Any word file should reproduce this bug if a context object is passed containing pop.

word contents:

code

from docxtpl import DocxTemplate

doc = DocxTemplate("test.docx")
doc.render(context={"pop": 2, "soil": {"pop": 2}})
doc.save("rendered.docx")

Expected behavior

Expecting all object to render

Screenshots

Additional context

POP is a soil variable which is used in geotechnical engineering.

Pop is off course a method of a dictionary object, but was not expected that a pop method would be called in Jinja. I would like to make a PR for this to either give the user a warning, raise a error (ValueError?) during rendering or make not of this behavior in the docs

[elapouya]

I think because pop is a function it will return the function representation which should look like something like :

<built-in method pop of dict object at 0x7fd349ddd140>

Which is not a valid xml tag, that's why the generated it not valid too. You can use autoescape=True in render() method to confirm that. You have to avoid using dict methods with dotted notation, please try :

{{ soil['pop'] }}

In your template instead.

[maarten-betman]

Thanks for the quick response! Confirmed that autoescape=True returns the function representation and that {{ soil['pop'] }} does render the correct results.

Would you accept a PR that introduces a warning or ValueError when a method of json is called with dot notation?

[elapouya]

You can propose a PR to add a note in the manual