fields_for a nested resource not working - ruby-on-rails-4

Question

I have the following associations:
class Campaign < ActiveRecord::Base
has_many :events
end
class Event < ActiveRecord::Base
belongs_to :campaign
belongs_to :venue
accepts_nested_attributes_for :venue
end
class Venue < ActiveRecord::Base
has_many :events
end
And I have the following form:
<%= form_for([#campaign, #event]) do |f| %>
<%= f.fields_for :venue do |v| %>
<%= v.text_field :search %>
<% end %>
<% end %>
Anything in the fields_for block is not showing up. But the funny thing is if i change f.fields_for :venue to f.fields_for :venues, the :search field shows up.
But :venues shouldn't be plural on :events. Even in rails console Event.venues does not work
NoMethodError: undefined method `venues'
It also generates the wrong field names
This makes me think I have my model associations jacked up, but after reviewing the docs. it does not seem so. Here is my schema for reference:
create_table "campaigns", force: true do |t|
t.integer "user_id"
t.string "title"
t.text "description"
t.integer "image_id"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "events", force: true do |t|
t.integer "campaign_id"
t.datetime "start_date"
t.datetime "end_date"
t.integer "venue_id"
t.integer "image_id"
t.datetime "created_at"
t.datetime "updated_at"
t.string "title"
t.text "description"
end
create_table "venues", force: true do |t|
t.float "latitude"
t.float "longitude"
t.string "address1"
t.string "address2"
t.string "city"
t.string "zip"
t.string "state"
t.string "country"
t.string "name"
t.string "gid"
t.datetime "created_at"
t.datetime "updated_at"
end

Answer 1

See the similar SO Posts
1.Does accepts_nested_attributes_for work with belongs_to?
2.Getting fields_for and accepts_nested_attributes_for to work with a belongs_to relationship
As mentioned in one of those posts,one way of achieving it is changing the accepts_nested_attributes_for to the has_many side
class Campaign < ActiveRecord::Base
has_many :events
accepts_nested_attributes_for :events
end
class Event < ActiveRecord::Base
belongs_to :campaign
belongs_to :venue
end
class Venue < ActiveRecord::Base
has_many :events
accepts_nested_attributes_for :events
end
If it is not,you might want to build a venue for events with #event.build_venue in the controller before calling fields_for.
Hope it helps!