CODEWITHSUNDEEP
pythonflaskjinja2
crooksey
crooksey

Reputation: 8809

Jinja2 convert float to decimal mid calculation

Due to some bad design decisions (not made by myself) I am left with a slight conundrum.

I had some code from a previous database query which was..

{{ order.pa_tranlength * order.pa_width * order.pa_costprice }}

This worked fine, however the database owner has now upgraded the database structure, and the last value order.pa_costprice is now a float, with the other two variables a decimal. Is there a way I can convert order.pa_costprice to a decimal on the fly mid calculation.

I have tried something like..

{{ order.pa_tranlength * order.pa_width * "%d" order.pa_costprice}}

Which obviously won't work as its a string value (I did test in my haste, but to no avail), but you can get the idea of what I am trying to do.

This loop is so large and comes directly from a database query, so I am trying to find a solution that means I don't have to modify any code before the query results hit the template.

Is there a workable solution from inside Jinja2 for this?

Upvotes: 2

Views: 1545

Answers (1)

Celeo
Celeo

Reputation: 5682

You wouldn't be modifying the code of the query, but if you can make a code change, you could make a template filter:

@app.template_filter('to_decimal')
def to_decimal_filter(f):
    return decimal.Decimal(f)

So:

{{ order.pa_tranlength * order.pa_width * order.pa_costprice }}

becomes:

{{ order.pa_tranlength * order.pa_width * order.pa_costprice|to_decimal }}

Upvotes: 2

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