I am trying to create a form that updates 2 tables in my database. I'm not quite sure how to build this contact form quite yet. So my first short term goal is to simply update my `contact_requests` and `users` tables. I am aiming to do a `one to many` relationship between `users` and `contact_requests`. This allows one `user` to have many `contact_requests`. I am new to rails so I feel like there are gaps in my code and I am making some mistakes as well. Ideally, I will want to include a mailer in the form as well but one step at a time.
I currently have a `user` table and a `contact_request` table:

`user_id` from the `contact_requests` table is a foreign key that references `
users.id`
Here is by current schema code:
ActiveRecord::Schema.define(version: 20141127114323) do
create_table "contact_requests", force: true do |t|
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "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
Here are my models and controllers:
class User < ActiveRecord::Base
has_many :contact_requests
# validate the presence of the attributes
validates(:first_name, presence: true)
validates(:last_name, presence: true)
validates(:email, presence: true)
end
class ContactRequest < ActiveRecord::Base
belongs_to :user
validates :user_id, presence: true
validates :message, presence: true, length: { maximum: 500 }
end
class ContactController < ApplicationController
def new
@user = User.new
@contact_request = ContactRequest.new
end
end
I am getting this error:

form:
<%= form_for(:contact, remote: true, 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(:user, :first_name, class: "form-control", placeholder: "First name")%>
</div>
<div class="contact-input-margin form-group">
<%= f.text_field(:user, :last_name, class: "form-control", placeholder: "Last name") %>
</div>
<div class="contact-input-margin form-group">
<%= f.email_field(:user, :email, class: "form-control", placeholder: "Email") %>
</div>
<div class="contact-input-margin form-group">
<%= f.telephone_field(:user, :phone_number, class: "form-control", placeholder: "Phone number") %>
</div>
</div>
<div class="contact-input-margin col-md-6">
<div class="form-group">
<%= f.text_area(:contact_request, :message, class: "form-control contact-margin", rows: "8", placeholder: "Message...") %>
</div>
</div>
</div>
<%= f.submit(class: "btn btn-xl") %>
<% end %>