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- if policy_session[:modalities] #array exists just add new value to it
- policy_session[:modalities] << [params[:modality], policy_session[:mode_list]]
- else #the array does't exist yet, so create and add first one.
- policy_session[:modalities] = [params[:modality], policy_session[:mode_list]]
- >> policy_session[:modalities]
- >># [["var_1"], "1",[["var_2"], ["2"]], [["var_3"], ["1"]]]
- >>policy_session[:modalities]
- >># [["var_1", "1"], ["var_2", "2"], ["var_3", "1"]]
- policy_session[:modalities] ||= [] # set it to an empty array if nil
- policy_session[:modalities] << [params[:modality], policy_session[:mode_list]]
- policy_session[:modalities] ||= [] # set it to an empty array if nil
- policy_session[:modalities] << [params[:modality], policy_session[:mode_list]].flatten
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