CODEWITHSUNDEEP
pythonflaskflask-restless
orangebanana3
orangebanana3

Reputation: 538

Is there a way to pass params to a Flask-Restless GET_SINGLE preprocessor?

GET_MANY preprocessors accept a built-in search_params dictionary, but GET_SINGLE ones only accept instance_id. A kw** arg is passed to all pre and postprocessors, but I've found that this is just for forwards compatibility, though this is somewhat unclear in the Flask-Restless docs:

The arguments to the preprocessor and postprocessor functions will be provided as keyword arguments, so you should always add **kw as the final argument when defining a preprocessor or postprocessor function. This way, you can specify only the keyword arguments you need when defining your functions. Furthermore, if a new version of Flask-Restless changes the API, you can update Flask-Restless without breaking your code.

Is it then not possible to pass parameters other than instance_id to a GET_SINGLE preprocessor?

EDIT

Perhaps there is a better way to do what I'm trying to do: I have two models, Foo and Bar. A record in Foo stores as one of its columns a foreign key to a record in Bar. I want a GET request sent to Foo which specifies a value for the foreign key to return a single quasi-random record from the set of records in Foo with a foreign key of the requested value.

Upvotes: 3

Views: 667

Answers (1)

orangebanana3
orangebanana3

Reputation: 538

As @1.618 pointed out, my particular use case is better suited for a GET_MANY request, even if I'm only expected a single item in response. I'm still unsure of the answer to my initial question, but my intuition is that that no, there is not a way to pass params to a GET_SINGLE request, as in Flask-restless they are only intended for scenarios where an item is queried by id.

The solution to my particular problem was to use a GET_MANY request instead, which I had initially tried but couldn't get to work due to my incorrectly manipulating the search_params argument and my confusion surrounding how variables are passed in Python.

Upvotes: 1

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