How to pass Rails form params to wicked_pdf

Question

I have this action,

  def email_student_report
   @current_year = Time.new.year
   @past_year = @current_year - 1
  end

Using this link to,

<%= link_to 'Email', samplecardreport_path(format: :pdf), :class => 'btn btn-warning termact_btns' %>

I calls this this action and generate a PDF document with wicked_pdf

  def sample_card_report
   @subjects = Subject.all
   @properties = Property.first
   @studentid = Student.where('studentid = ?', params[:email_search_stuent_id]).last!
   #@studentid = Student.where('studentid = ?', 'EkGSS-181').last!
   @studentresults = TermReport.where('studentid =? and term =? and form_class =? and year =?', params[:email_search_stuent_id], params[:term], params[:form_class], params[:year])
   @totalstudent = TermReport.group('form_class, term, year, studentid').where('form_class =? and term =? and year =?', params:form_class],params[:term],params[:year],)

   respond_to do |format|
    format.html
    format.pdf do
     render pdf: 'student_report_card',
     template: "term_reports/sample_card_report.pdf.erb"
    end
   end
  end

Now my problem is the generated PDF document is blank. And debugging shows that the form params are not being passed so the query is fetching blank. How can I resolve this?

Answer 1

You will need to send the params manually from the link_to tag using the below mentioned:

<%= link_to 'Email', samplecardreport_path(format: :pdf, param1: value1, param2: value2), :class => 'btn btn-warning termact_btns' %>

In your case it would be these params

<%= link_to 'Email', samplecardreport_path(format: :pdf, email_search_stuent_id: value1, term: value2,form_class: value3, year: value4), :class => 'btn btn-warning termact_btns' %>

Also the syntax in this line is also not correct, it is missing [ in form class params

@totalstudent = TermReport.group('form_class, term, year, studentid').where('form_class =? and term =? and year =?', params:form_class],params[:term],params[:year],)

Correct

@totalstudent = TermReport.group('form_class, term, year, studentid').where('form_class = ? and term = ? and year = ?', params[:form_class],params[:term],params[:year],)