Rails form params changing in controller

I have a form:

<%= form_for(:report_main, :u开发者_如何学运维rl => {:action => 'exporttoxiccreate'}) do |f| %>
<%= collection_select(:waste, :code, Waste.find_all_by_istoxic(false), :id, :code, :include_blank => '') %>
<%= f.check_box(:q_pripadnost) %>
<%= f.text_field(:amount) %>
<% end %>

and this code in controller:

def exporttoxiccreate
    @report = ReportMain.new
    @reportexport = ReportExport.new
    @reportparam = params[:report_main]

    @report.waste_id = @reportparam.waste.code
    @report.amount = @reportparam.amount

    if @report.save
      @reportexport.report_main_id = @report.id
    else
      redirect_to(:action => 'exporttoxicnew')
    end

    @reportexport.q_pripadnost = @reportparam.q_pripadnost

    if @reportexport.save
      redirect_to(:action => 'show', :id => @reportexport.id)
    else
      redirect_to(:action => 'exporttoxicnew')
    end
  end

I want to save in two tables, in two objects data from this form, and I need to separate params to manipulate with. I tried with this:

@reportexport.q_pripadnost = @reportparam.q_pripadnost

I want to set q_pripadnost field in @reportexport with some value from param.

Where I make mistake?

When you get params from a form in Rails, it comes in the form of a hash. For example:

params[:report_main][:waste]
params[:report_main][:amount]

So when you call @reportparam = params[:report_main], you are setting @reportparam to a hash, but then you are trying to use it later like an object. For example, instead of @reportparam.q_pripadnost, use @reportparam[:q_pripadnost].

You can take a closer look at your variable by temporarily changing your action to show a text version of the variable, for example:

def exporttoxiccreate
    @reportparam = params[:report_main]
    render :text => @reportparam.to_yaml
end