passing params from A view to Bs_controller

A.html.erb

<div>
<%if current_user%>	
	<%=form_for(ModelB.new) do |f|%>
	  <%if (params[:param_to_check].present?)%>
	    <%f.hidden_field "param1",:value=> @modelA.id%>
	    <%f.hidden_field "param2",:value=> current_user.id%>
	  <%end%>
	render button
	<%end%>
<%else%>
	render other butotn
<%end%>

Bs_controller.rb

@modelA=ModelA.find_by_id(params[:param1])
 :option_from_specific_gem=> -(@modelA.wanted_value).abs