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Defining location for a block of fields #90

tuukkamustonen opened this issue Feb 18, 2016 · 3 comments


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commented Feb 18, 2016

Reading the docs, I can see that one can restrict locations for all parameters as whole as in:

@use_args({...}, locations=('json', 'form'))

But if I mix parameters from different locations together (and I only accept parameter from one location), I still need to provide location for each parameter separately:

    'command': fields.Str(location='json),
    'recurse': fields.Bool(location='query')
}, locations=('json', 'query'))  # location here does not actually have effect afaik

Is it ok to provide @use_args twice to achieve something like:

@use_args({...}, locations=('json',))
@use_args({...}, locations=('headers',))
@use_args({...}, locations=('query',))

Or could we do it via nesting or something:

    {'schema': {...}, locations=('json',)},
    {'schema': {...}, locations=('headers',)},
    {'schema': {...}, locations=('query',)}

And maybe have built-in decorators for most common locations:


If there were lots of parameters to validate, these would slightly reduce the size of the boilerplate.


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commented Apr 8, 2016

I have just confirmed that "stacking" use_args works.

query_args = {
    'page': fields.Int()
json_args = {
    'name': fields.Str(),
@app.route('/stacked', methods=['GET', 'POST'])
@use_args(query_args, locations=('query', ))
@use_args(json_args, locations=('json', ))
def viewfunc(query_parsed, json_parsed):
    return jsonify({
        'json': json_parsed,
        'query': query_parsed

The decorator shortcuts could easily implemented with partial

import functools
query = functools.partial(use_args, locations=('query', ))
json = functools.partial(use_args, locations=('json', ))

def viewfunc(query_parsed, json_parsed):

In the interest of keeping the webargs API small, I probably won't be adding these into the codebase. They're simple enough for users to implement.

sloria added a commit that referenced this issue Apr 8, 2016

@sloria sloria added the question label Apr 8, 2016

@sloria sloria closed this Apr 8, 2016


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commented Apr 9, 2016

@sloria That's pretty neat, thanks!

For me this is fine, but considering the overall user-friendliness of the library, I think it would make sense to add those couple of lines to the codebase. It's way more descriptive to specify @headers and @cookies, etc. and I assume people are rarely mixing the locations anyway.

Though this is just my assumption, I suggest to reconsider :)


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commented Apr 9, 2016

@tuukkamustonen It wouldn't just be a couple lines. It would be 6 lines for each of the locations * 8 frameworks = 48 LOC, plus tests. Also, naming is a bit tricky; @json, for example, would shadow the oft-imported json from the stdlib.

I would be much more open to adding a section in the Advanced Usage docs that had snippets for shortcuts like this. PRs welcome =) .

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