Passing ActionView::Helpers::FormBuilder to a partial - ruby-on-rails

Question

I am atempting to dinamically create form elements given a certain AJAX request.
This is my setup:
View:
<%= link_to 'Next', check_unique_id_students_path, :remote => true %>
<div id="guardian_student_details"></div>
Controller:
def check_unique_id
#student = Student.new
#this_form = ActionView::Helpers::FormBuilder.new(:student, #student, #template, {}, proc{})
end
JS:
jQuery("#guardian_student_details").html("<%=escape_javascript(render :partial => "student_details", :locals => { :s => #this_form }) %>");
Partial:
<% puts s.text_field :first_name %>
<% puts s.field_helpers %>
For debugging purposes i placed the following lines at the very beginning of my partial:
<% puts s.class.to_s %>
<% puts s.object.to_s %>
This prints out :
ActionView::Helpers::FormBuilder
Student
This should work. However rails is giving the following error:
ActionView::Template::Error (undefined method `text_field' for nil:NilClass):
1: <% puts s.class.to_s %>
2: <p>
3: <%= s.text_field :first_name, :class => 'text_input is_empty' %>
4: <%= s.label :first_name %><strong>*</strong>
5: </p>
6:
app/views/students/_student_details.html.erb:3:in _app_views_students__student_details_html_erb__2485891544130782916_2214680440'
app/views/students/check_unique_id.js.erb:2:in_app_views_students_check_unique_id_js_erb__3504800328150418937_2214933160'
Which implies that "s" is NIL something I verified just 2 lines before. Does anybody have any ideas? i dont know if this has something to do with the "#template" variable initialized in the controller. Which i played around with and accepts practically anything and if printed is nil.
Any help would be appreciated. Thanks
Final note:
I tried to implement this: AJAX update of accepts_nested_attributes_for partials

Answer 1

For anyone needing to build a form builder in the controller, view_context still works there. Using Rails 4.1.4:
#object = Object.new
#f = ActionView::Helpers::FormBuilder.new(:object, #object, view_context, {})

Answer 2

In the view, I've found that 'view_context' does not work in Rails 3.1. Instead try 'self' when creating a FormBuilder object.
s = ActionView::Helpers::FormBuilder.new(:student, #student, self, {}, proc{})

Answer 3

Try this in a console :
s = ActionView::Helpers::FormBuilder.new(:student, #student, #template, {}, proc{})
s.text_field :first_name
You will have the same error. I think the problem come from your creation of the form_builder object, even if I don't know the exact mistake...
Your solution seems to me to be a little much complex. You can try this solution :
#html.erb
<% form_for #student do |f| %>
<div id='guardian_student_details' class='hide-this-block'>
<%= render :partial => "student_details", :locals => { :s => f }) %>
</div>
<% end %>
#js
jQuery("#guardian_student_details").show();
Generally, I prefer keep javascript and ruby separated.