rails 4.0 undefined method -

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i have opportunity model has activity nested resource. on opportunities/show page, have list of activities opportunity , form add new activities. when click "add activity" get:

undefined method `activities' nil:nilclass

here error source:

 # post /activities.json   def create     @activity = @opportunity.activities.new(activity_params)     if @activity.save       redirect_to @opportunity, notice: 'activity has been added'     else

i defined opportunity model having many activities , activities belongs to opportunity. here relevant parts of activity controller:

def create   @activity = @opportunity.activities.new(activity_params)   if @activity.save     redirect_to @opportunity, notice: 'activity has been added'   else     redirect_to @opportunity, alert: 'unable add activty'   end end

and here views/activities/new code

<%= form_for ([@opportunity, @opportunity.activities.new]) |f| %> <div class="field">     <%= f.label "date assigned" %> <br />     <%= f.text_field :date_assigned %>  </div> <div class="field">     <%= f.label "date due" %> <br />     <%= f.text_field :date_due %>  </div> <div class="field">     <%= f.label "description" %> <br />     <%= f.text_field :description %>  </div> <div class="field">     <%= f.label "status" %> <br />     <%= f.text_field :status %>  </div> <div class="actions">     <%= f.submit 'add' %>  </div>   <% end %>

my routes:

resources :opportunities    resources :activities end

thank you!!

your @opportunity undefined(nil) in block.

you must @opportunity prior building activities on :

@opportunity = opportunity.find(params[:opportunity_id])

(reason :opportunity_id : since activitycontroller , model nested, conventional nested restful resources (as specified in routes), parameter automatically assigned model_id => opportunity_id)

changed code: 

def create   @opportunity = opportunity.find(params[:opportunity_id])   @activity = @opportunity.activities.new(activity_params)   if @activity.save     redirect_to @opportunity, notice: 'activity has been added'   else

also, recommend use build instead of new while building object relations.


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