I have data I am trying to POST that looks like { foo: [[:bar, 1], [:baz, 0]] }.
How do I permit that using strong parameters? The closest I can get is
params.permit(foo: [[]]) which returns {"foo"=>[]}
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I can't find a reference now, but I have a recollection that foo: [][] will work?SteveTurczyn– SteveTurczyn2013-11-04 23:24:20 +00:00Commented Nov 4, 2013 at 23:24
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params.permit(foo: [][]) *** ArgumentError Exception: wrong number of arguments (0 for 1..2)maletor– maletor2013-11-04 23:31:38 +00:00Commented Nov 4, 2013 at 23:31
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Don't you want params.permit(foo:[[][]])? Or you might want to try params.permit(food:[bar:[],baz:[]]) if nested.ChrisBarthol– ChrisBarthol2013-11-05 02:38:38 +00:00Commented Nov 5, 2013 at 2:38
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The first one fails with the same error I posted above and the second one returns the same as I posted in the original question.maletor– maletor2013-11-05 17:43:05 +00:00Commented Nov 5, 2013 at 17:43
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2 Answers
Maletor,
it seems to me that the strong parameters can't handle array of array. I did read the code of it in github and it deals with Symbol, String and Hash.
For this case you'll have to handle with your own code.
Comments
Basically:
def permitted_params
result = params.require(:model).permit(:attributes).to_h # No array of arrays or hashes
result[:model][:array_of_arrays] = params[:model][:array_of_arrays]
result
end
One step further, say you have a Model#json and you want to store model.json[:array_of_arrays] = [[]]:
def permitted_params
result = params.require(:model).permit(:attributes).to_h # No array of arrays or hashes
result[:json] ||= {}
result[:json].merge!(array_of_arrays: params[:model][:json][:array_of_arrays])
result
end
Make sure you have permitted all your un-trusted params before you call to_h, and be careful what you merge in afterwards.
