ruby on rails - undefined method `fetch_value' for nil:NilClass when using Roo -

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i trying use roo import data excel spreadsheet table (data_points) in rails app.

i getting error:

undefined method `fetch_value' nil:nilclass

and error references data_point.rb file @ line (see below full code excerpt):

data_point.save!

the "application trace" says:

app/models/data_point.rb:29:in `block in import' app/models/data_point.rb:19:in `import' app/controllers/data_points_controller.rb:65:in `import'

i puzzled because "find all" in entire app shows no instance of fetch_value

here other code in app:

in model, data_point.rb:

class datapoint < activerecord::base attr_accessor :annual_income, :income_percentile, :years_education  def initialize(annual_income, income_percentile, years_education)     @annual_income = annual_income     @income_percentile = income_percentile     @years_education = years_education end  def self.import(file)     spreadsheet = open_spreadsheet(file)     header = spreadsheet.row(1)     (2..11).each |i|          annual_income = spreadsheet.cell(i, 'a')         income_percentile = spreadsheet.cell(i, 'b')         years_education = spreadsheet.cell(i, 'c')         data_point = datapoint.new(annual_income, income_percentile, years_education)         data_point.save!     end end   def self.open_spreadsheet(file)     case file.extname(file.original_filename)     when ".xlsx" roo::excelx.new(file.path)     else raise "unknown file type: #{file.original_filename}"     end end end

in controller, data_points_controller.rb have added, in addition standard rails framework:

def import     datapoint.import(params[:file])     redirect_to root_url, notice: "data points imported." end

in excel file i'm using, header row has column names same 3 attributes noted above datapoints: annual_income, income_percentile, years_education

p.s. have watched railscast 396: importing csv , excel, , read comments many times. think struggling translating example code rails 4 , / or assignment of individual attributes (vs. approach used in railscast).

thanks in advance help!

it seems had leftovers non rails practice, found in comments. notably, overwritten initialize method, , attr_accessor each of attributes. removing them (and fixing datapoint.new() correct format) needed.


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