Question

My view for the new form is

<h1>Add Form 3C </h1>
<%= form_for([@basiccase, @form3c]) do |f| %>
    <%= render 'shared/error_messages', :object => f.object %>

    <div class="field">
        <%= f.label :date_of_investigation %>
        <%= f.date_select :date_of_investigation, {:include_blank => true, :default => nil} %>
        </div>
 <div class="actions">
        <%= f.submit "Add Form" %>
     </div>

<% end %>

My controller for new and create are

def new
    @title = "New Form 3C"
    @basiccase = Basiccase.find_by_id(params[:basiccase_id])
    @form3c = @basiccase.build_form3_c
  end

  def create
    @basiccase = Basiccase.find_by_id(params[:basiccase_id])
    @form3c = @basiccase.build_form3_c(params[:form3c])
             if @form3c.save
            flash[:success] = "Form created!"
            redirect_to current_user
          else
            flash[:warning] ="Failed to create a Form"
            render 'users/show'
          end
  end

I’m unable to get the value of params[:form3c] into the the create controller. when I tried to check puts params[:form3c] it is showing blank. Can Any on help me where i’m wrong

Answer 1

A params key will be based on your class name. Rails expects class names to be mixed case (e.g. BasicCase) and creates the param key by lowercasing and separating the words with an underscore.

You can check this in a Rails console using #underscore:

1.9.2p290 :001 > "BasicCase".underscore
 => "basic_case" 

I imagine you have named your class Form3C which becomes form3_c as Dylan suggested.

You may want to consider renaming both your models to BasicCase and Form3c which should give you params basic_case_id and form3c.