by on Rails can't convert ActiveSupport::HashWithIndifferentAccess into String

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Hi Everyone,

I had a errors can't convert ActiveSupport::HashWithIndifferentAccess into String. This errors because I wrong on determining params json.

For example:
1. I had params:
{:tabular => {"file"=>"data_tabular_Pemerintahan (Adm Pemerintahan, Aparatur Negara dan Adm Kepegawaian)_kecamatan Admin_2013.xls"}}
2. I call on my speadsheet:
    def export
      workbook = Spreadsheet.open(params[:tabular])
    end
3. On above is not specified to parse parameter. So put this
    def export
      workbook = Spreadsheet.open(params[:tabular][:file])
    end

I hope this article can help you,