Best practices for manipulating template context (based on initial context)

[Geoffrey Hing]

I've found for many of my Tarbell projects that I want to manipulate the context after it's been retrieved from the Google sheet.

Right now, we handle this using custom filters in the Blueprint, but this adds more cruft and {% set %} in the templates than I'd like.   I suppose another option would be to do some of these calculations in the spreadsheet itself, but I'd much rather write logic in Python, under version control.

Ideally there would be some API hook like Django's context processors that would let you alter the context after it's been loaded from DEFAULT_CONTEXT, the filesystem, or the Google sheet but before it hits the template.  

How are others handling this?

Best,
Geoff

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Geoffrey Hing
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[David Eads]

Hey Geoff, I haven't forgotten about this, but haven't had time to respond. At the moment, there is no hook to do this -- the preview hook runs before the context is built, which was probably a mistake. But we could add one in the next release. There's probably also a more Flask-y way -- using after_request or something. I'll check it out and let you know.

David

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David Eads | http://recoveredfactory.net

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[Geoffrey Hing]

Looked into this a bit more.  Flask has context processors, but they only allow you to add items to the context, not alter existing values.

The use case for this is to transform data in the spreadsheet, usually to add calculated values or to join data in multiple sheets.  Right now I use filters defined in the blueprint and the {% set %} template tag.

-Geoff

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