Nested form won't save, Rails 4 - ruby-on-rails

Question

I can't figure out what I am doing wrong, but my nested form will not save to my room table.
Here's my view
new.html.erb
<h1>Room Assignments</h1>
<p>
<%= form_for #member do |f| %>
<%= f.label :name, "Member name" %><br>
<%= f.text_area :name %><br>`enter code here`
<%= f.fields_for :room do |b| %>
<%= b.label :room_name %><br>
<%= b.text_area :room_name %><br>
<%= b.label :rent %><br>
<%= b.text_area :rent %><br>
<% end %>
<%= f.submit "Submit" %>
<% end %>
members_controller.rb
class MembersController < ApplicationController
def new
#member = Member.new
#member.purchases.build
#room = #member.build_room
end
def index
#member = Member.all
end
def create
#member = Member.create(member_params)
#room = #member.create_room
if #member.save
redirect_to new_purchase_url
else
render :new
end
end
def show
#member = Member.find(params[:id])
end
def member_params
params.require(:member).permit(:name, :room_id,
room_attributes: [:rent, :name, :id, :member_id],
purchase_attributes: [:description, :cost, :id, :member_id])
end
end
member.rb
class Member < ActiveRecord::Base
belongs_to :room
has_many :purchases
accepts_nested_attributes_for :purchases, :room
end
room.rb
class Room < ActiveRecord::Base
has_one :member, foreign_key: "member_id"
has_many :purchases
end
This is what prints out in the rails console when I check to see if it has saved:
2.0.0-p451 :070 > Member.last
Member Load (0.3ms) SELECT "members".* FROM "members" ORDER BY "members"."id" DESC LIMIT 1
=> #<Member id: 24, name: "Tom", room_id: 38>
2.0.0-p451 :071 > Room.last
Room Load (0.3ms) SELECT "rooms".* FROM "rooms" ORDER BY "rooms"."id" DESC LIMIT 1
=> #<Room id: 38, room_name: nil, rent: nil, member_id: nil>

Answer 1

The problem is that you're calling #room = #member.create_room in the create action. The previous line should have already pulled in the parameters and built the member and room instances. So when you call create_room you're actually replacing the room that was added with a new (blank) one. Here's what I would do:
def create
#member = Member.new(member_params)
if #member.save
redirect_to new_purchase_url
else
render :new
end
end