Export CSV with filterrific

[DRGluke]

I'm having trouble exporting my filtered results to a csv.

I tried following some info I found in issue #25 that had similar trouble.

I'm using rails 7 and the filterrific 5.2.3

Controller index action:

  def index
    @filterrific = initialize_filterrific(
      Result,
      params[:filterrific],
      select_options: {
        sorted_by: Result.options_for_sorted_by,
      },
      default_filter_params: {},
    ) or return
    @results = @filterrific.find.page(params[:page])

    respond_to do |format|
      format.html
      filename = "Result-#{Time.now.to_date.to_s}.csv"
      format.csv { send_data @results.to_csv(), filename: "filename"}
    end
  end

Model:

class Result < ApplicationRecord
  belongs_to :customer
  belongs_to :user

  require 'csv'

  filterrific(
    default_filter_params: { sorted_by: 'created_at_desc' },
    available_filters: [
      :sorted_by,
      :with_survey_only,
      :with_offer_only,
    ]
  )

  scope :sorted_by, ->(sort_option) {
    direction = /desc$/.match?(sort_option) ? "desc" : "asc"
    case sort_option.to_s
    when /^created_at_/
      order("results.created_at #{direction}")
    else
      raise(ArgumentError, "Invalid sort option: #{sort_option.inspect}")
    end
  }

  scope :with_survey_only, lambda { |flag|
    return nil  if 0 == flag
    where(survey: true)
  }

  scope :with_offer_only, lambda { |flag|
    return nil  if 0 == flag
    where(offer: true)
  }

  def self.options_for_sorted_by
    [
      ["Created date (newest first)", "created_at_desc"],
      ["Created date (oldest first)", "created_at_asc"],
    ]
  end

  def self.to_csv(options = {})
    CSV.generate(options) do |csv|
      csv << column_names
        all.each do |result|
        csv << result.attributes.values_at(*column_names)
      end
    end
  end
end

and in my view: <%= link_to "Export as CSV", results_path(format: :csv, filterrific: @filterrific.to_hash) %>

I'm getting this problem with it:

no implicit conversion of Hash into String

  def self.to_csv(options = {})
    CSV.generate(options) do |csv| <----problem at this line
      csv << column_names
        all.each do |result|
        csv << result.attributes.values_at(*column_names)

I'm still learning, so have probably got something obvious wrong.