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| # This is a Service Object for generating special PDF with a list of countries. | |
| # country_pdf_list.rb | |
| # I prefer to use Sendi Matz rule | |
| # Classes can be no longer than one hundred lines of code. | |
| # Methods can be no longer than five lines of code. | |
| # Pass no more than four parameters into a method. Hash options are parameters. | |
| # Controllers can instantiate only one object | |
| require "wicked_pdf" | |
| class CountryPdfList | |
| def call | |
| save_data_to_pdf(pdf_infection_country_render) | |
| end | |
| def file_path | |
| Rails.root.join('tmp', 'pdfs', "pdf_infection_country_list_#{time_now}.pdf") | |
| end | |
| private | |
| def pdf_infection_country_render | |
| ac = ActionController::Base.new.render_to_string(pdf_params) | |
| WickedPdf.new.pdf_from_string(ac) | |
| end | |
| def pdf_params | |
| { | |
| template: "admin/travel_check/countries/generate_list_of_country_pdf.html.erb", | |
| title: "Countries Infection List, #{time_now}", | |
| encoding: 'utf-8' | |
| } | |
| end | |
| def save_data_to_pdf(pdf_file) | |
| File.open(file_path, 'wb') do |file| | |
| file << pdf_file | |
| end | |
| end | |
| def time_now | |
| Time.now.strftime("%Y-%m-%d") | |
| end | |
| end | |
| # method from controller.rb | |
| def generate_list_of_country_pdf | |
| create_pdf_list = CountryPdfList.new | |
| create_pdf_list.call | |
| send_file create_pdf_list.file_path, :disposition => 'attachment' | |
| end | |
| # Also it eaysy to test | |
| require 'rails_helper' | |
| RSpec.describe CountryPdfList, type: :service do | |
| before(:each) do | |
| @pdf_country_list = CountryPdfList.new.create_country_pdf | |
| end | |
| context "create a pdf with countrry list" do | |
| it { @pdf_country_list.create_country_pdf be_kind_of(File) } | |
| it "create_country_pdf " do | |
| expect(@pdf_country_list).with("pdf_infection_country_list_2020-02-07.pdf", "w") | |
| @pdf_country_list.should be_true | |
| File.should_receive(:open).with("filename", "w").and_yield(file) | |
| end | |
| it 'generated PDF file' do | |
| filename = "pdf_infection_country_list_2020-02-07.pdf" | |
| allow(File).to receive(:open).with(filename,'w') | |
| # call the function that writes to the file | |
| File.open(@filename, 'w') {|f| f.write(@content)} | |
| end | |
| end | |
| end |
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