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Editorial Team
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Asked: 2026-06-16T08:08:19+00:00

While studying a Rails application I saw statements like: parameter[:user_id] params[:user_id] params[userid] Can anyone

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While studying a Rails application I saw statements like:

parameter[:user_id]
params[:user_id]
params["userid"]

Can anyone tell me if there any major difference between them? Or, are all
fetching parameters only and can I use them interchangeably?

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1 Answer

  1. Editorial Team
    parameter[:user_id]

    I don’t think this is something official. However there’s a parameters method on the current request object. See request.parameters in a controller action.

    params[:user_id]

    Using the params[:user_id] is the same as calling request.parameters[:user_id]. Also params[:user_id] is the same as params["user_id"]. See HashWithIndifferentAccess.

    I am not sure if that’s just a typo on your part, but params[:user_id] and params["userid"] are not the same, even with HashWithIndifferentAccess. The _ won’t just go away so they can hold different values.

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