[Rails] numbers of the days

Hi John.
I like this library, it was just what I wanted.
I am a newbie, i did not understand how to put dynamically the numbers
of the days in the method IceCube::Rule.weekly

i have try this under Ruby on Rails:

######################

all_days = []
all_days << 1 if params[:recurrent][:mon]
all_days << 2 if params[:recurrent][:tue]
all_days << 3 if params[:recurrent][:wed]
all_days << 4 if params[:recurrent][:thu]
all_days << 5 if params[:recurrent][:fri]
all_days << 6 if params[:recurrent][:sat]
all_days << 7 if params[:recurrent][:sun]

schedule.add_recurrence_rule IceCube::Rule.weekly.day.all_days

#####################

but i have an error
thank you.

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