Updating two tables with one to many relationship via form - ruby-on-rails

Question

I am trying to update my two tables through my form but I am getting this error:
Started POST "/test" for ::1 at 2014-12-02 00:15:21 -0800
Processing by UsersController#create as JS
Parameters: {"utf8"=>"✓", "users"=>{"first_name"=>"sdfdsfdsf", "last_name"=>"dsfdsfds", "email"=>"3213213#hotmail.com", "phone_number"=>"23123213", "message"=>"sdfdsfsdfdsfkjsdfksdfk;adklsfjksadfksjdfklsdf"}, "commit"=>"Save Users"}
Completed 500 Internal Server Error in 1ms
ArgumentError (wrong number of arguments (1 for 0)):
app/controllers/users_controller.rb:32:in `create'
Rendered /Users/bli1/.rvm/gems/ruby-2.1.3/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_source.erb (2.6ms)
Rendered /Users/bli1/.rvm/gems/ruby-2.1.3/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_trace.text.erb (0.4ms)
Rendered /Users/bli1/.rvm/gems/ruby-2.1.3/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/_request_and_response.text.erb (0.6ms)
Rendered /Users/bli1/.rvm/gems/ruby-2.1.3/gems/web-console-2.0.0/lib/action_dispatch/templates/rescues/diagnostics.text.erb (12.2ms)
I have been reading examples and documentation and I think I wrote my form correctly but I think my controller is missing some aspects because I am new to rails.
Here is my schema:
ActiveRecord::Schema.define(version: 20141130075753) do
# These are extensions that must be enabled in order to support this database
enable_extension "plpgsql"
create_table "contact_requests", force: true do |t|
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.text "message", null: false
t.integer "user_id"
end
add_index "contact_requests", ["user_id"], name: "index_contact_requests_on_user_id", using: :btree
create_table "users", force: true do |t|
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "first_name", null: false
t.string "last_name", null: false
t.string "email", null: false
t.string "phone_number"
end
end
Models:
class User < ActiveRecord::Base
has_many :contact_requests
validates(:first_name, presence: true)
validates(:last_name, presence: true)
validates(:email, presence: true)
accepts_nested_attributes_for :contact_requests
end
class ContactRequest < ActiveRecord::Base
belongs_to :user
validates :user_id, presence: true
validates :message, presence: true, length: { maximum: 500 }
end
user controller:
def create
if !(User.find_by(email: params[:users][:email]))
#user = User.new(user_params)
#contact_request = ContactRequest.new(contact_request_params)
#contact_request.save
#user.save
else
#contact_request = ContactRequest.new(contact_request_params)
#contact_request.save
end
end
private
def user_params
# strong_parameters, which requires us to tell Rails exactly which parameters
# we want to accept in our controllers
params.require(:users).permit(:first_name, :last_name, :email, :phone_number)
end
end
form:
<!-- contact -->
<section id="contact">
<div class="container">
<div class="title-container">Contact Us</div>
<div class="title-caption">Reach us at (415)-911-9999</div>
<%= form_for(:users, remote: true, id: "contact-form", class: "contact-input") do |f| %>
<div class="col-md-12">
<div class="col-md-6">
<div class="contact-input-margin form-group">
<%= f.text_field(:first_name, class: "form-control", placeholder: "First name")%>
</div>
<div class="contact-input-margin form-group">
<%= f.text_field(:last_name, class: "form-control", placeholder: "Last name") %>
</div>
<div class="contact-input-margin form-group">
<%= f.email_field(:email, class: "form-control", placeholder: "Email") %>
</div>
<div class="contact-input-margin form-group">
<%= f.telephone_field(:phone_number, class: "form-control", placeholder: "Phone number") %>
</div>
</div>
<div class="contact-input-margin col-md-6">
<div class="form-group">
<%= f.fields_for :contact_requests do |builder| %>
<%= f.text_area(:message, class: "form-control contact-margin", rows: "8", placeholder: "Message...") %>
<% end %>
</div>
</div>
</div>
<%= f.submit(class: "btn btn-xl") %>
<% end %>
</div>
</section>