Can't generate pdf with wicked_pdf in rails ,using search results - ruby-on-rails

Question

Hi everybody I'm trying to use wicked pdf in rails.
Get a pdf based on the object generated by the query, #questions
When downloading the pdf, the query data is lost.
when I visit "/simulators.pdf" it shows me the following error in console
Started GET "/simulators.pdf" for 127.0.0.1 at 2018-11-01 12:38:19 -0500
Processing by SimulatorsController#index as PDF
Test Load (0.2ms) SELECT "tests".* FROM "tests" WHERE "tests"."name" IS NULL LIMIT $1 [["LIMIT", 1]]
CACHE Test Load (0.0ms) SELECT "tests".* FROM "tests" WHERE "tests"."name" IS NULL LIMIT $1 [["LIMIT", 1]]
Completed 500 Internal Server Error in 3ms (ActiveRecord: 0.2ms)
NoMethodError (undefined method `id' for nil:NilClass):
Controller:
def index
#test = Test.find_by(name: params[:test])
#questions = TestQuestion.joins(:test).where(test_id: #test.id).order('RANDOM()').limit(10)
respond_to do |format|
format.html
format.pdf { render template: 'simulators/pdf', pdf: 'pdf'}
end
end
URL:
http://localhost:3000/simulators?test=biology
This is url of index view
Can you help me?
Many thanks

Answer 1

that's because when you ask for the pdf, you need to send the query in the url too
http://localhost:3000/simulators.pdf?test=biology
if you don't send the variable in the url, the search that you are doing will be nil, that's the error you are having.