rails export csv return empty in production which works fine locally

Question

I tried to export a csv file in my Rails app.

It works fine locally and if will return a csv file with data. However when push to production, it return a csv file which is empty.

Is there any possible reason about this problem?

View:

<%= link_to "Export Places", {controller: "admin/neighborhoods", action: "export_csv", format: "csv"}, 'data-no-turbolink' => true, :class => "button" %>

Route:

get 'admin_neighborhoods_export' => 'admin/neighborhoods#export_csv'

Controller:

def export_csv
@neighborhoods = Neighborhood.order(:created_at)
time = Time.now.strftime("%Y%m%d%H%M%S").to_s
respond_to do |format|
  format.html
  format.csv do
    headers['Content-Disposition'] = "attachment; filename=\"places_export_#{time}.csv\""
    headers['Content-Type'] ||= 'text/csv'
    send_data(Neighborhood.to_csv(@neighborhoods), :type => "text/csv", :filename => "places_export_#{time}.csv")
  end
end

end

Modal:

def self.to_csv(neighborhoods)
CSV.generate(headers: true) do |csv|
  nbh_columns = []
  nbh_columns.concat(column_names)
  nbh_columns.concat(["maponics_neighborhood", "maponics_city", "maponics_state"])
  csv << nbh_columns
  neighborhoods.each do |neighborhood|
    values = []
    values.concat(neighborhood.attributes.values_at(*column_names))
    if neighborhood.gid.present?
      nbh_maponic = NeighborhoodBoundariesMaponics.find(neighborhood.gid)
      values.concat([nbh_maponic.neighborhd, nbh_maponic.city, nbh_maponic.state])
    else
      values.concat(["", "", ""])
    end
    csv << values
  end
end

end

Answer 1

Have found the reason.

There is a bad data in production db. So one error happens when I use 'find' to search a row in db.

NeighborhoodBoundariesMaponics.find(neighborhood.gid)

Now I change to use 'where' and it works.