How to create a nested signup form?

I have two models each with their own resources: Organizations and
An organization has multiple members and a member is only a member to

How can I create a simple nested form that signs up a new organization
well as one member for that organization?

My current attempt is below. On submitting the form, this however
the error message
unknown attribute ‘org_name’ for Member
, which I don’t get especially since org_name is a column within the
Organization model and not the Member model.

Organization model

has_many :members, dependent: :destroy
accepts_nested_attributes_for :members, :reject_if => :all_blank,
:allow_destroy => true

Member model

belongs_to :organization

Organizations controller

def new
@organization =
@member =

def create
@organization =
@member =
if &&
@member.send_activation_email #Will Rails be able to get to this
method? The send_activation_email method exists in multiple models and
Rails should here use the version from the Member model.
flash[:success] = “Please check your email to activate your
redirect_to root_url
render ‘new’

def organizationnew_params
member_attributes: [:email,

Organizations new view

<%= form_for(@organization) do |f| %>
<%= f.text_field :org_name, %>
<%= f.text_field :phone %>

<%= f.fields_for :member do |p| %>
<%= p.text_field :username %>
<%= p.email_field :email %>
<%= p.password_field :password %>
<%= p.password_field :password_confirmation %>
<%= hidden_field_tag :admin, true %>
<% end %>

<%= f.submit “Sign up”, class: “formbutton btn btn-default” %>
<% end %>

What am I doing wrong? How can I create a simple nested form?

I think the model for your form should be @member, the last object in
controller def new

An update:

In the new view it turned out I needed
<%= f.fields_for :members do |p| %>
So plural “members”. Similar, in the params in the controller I changed
member_attributes to members_attributes, again the plural form.

Also, in def create in the organizations controller, I removed the line:
@member =

Having done all this, I now get a flash error message on submission of
The form contains 1 error:

  • Members organization can’t be blank

The server log:

Processing by OrganizationsController#create as HTML
Parameters: {“utf8”=>“✓”, “organization”=>{“org_name”=>“sadfsdaf”,
“phone”=>“sdfds”, “members_attributes”=>{“0”=>{“username”=>
“fsfdsfsad”, “email”=>“[email protected]”, “fullname”=>“sdfds”,
“password_confirmation”=>"[FILTERED]"}}}, “admin”=>“true”,
“commit”=>“Sign up”}
(0.5ms) begin transaction
Member Exists (0.4ms) SELECT 1 AS one FROM “members” WHERE
LOWER(“members”.“email”) = LOWER(‘[email protected]’) LIMIT 1
Member Exists (0.2ms) SELECT 1 AS one FROM “members” WHERE
LOWER(“members”.“username”) = LOWER(‘fsfdsfsad’) LIMIT 1
Organization Exists (0.3ms) SELECT 1 AS one FROM “organizations” WHERE
LOWER(“organizations”.“org_name”) = LOWER(‘sadfsdaf’) LIMIT 1
Organization Exists (0.2ms) SELECT 1 AS one FROM “organizations” WHERE
LOWER(“organizations”.“phone”) = LOWER(‘sdfds’) LIMIT 1
(0.2ms) rollback transaction
Rendered shared/_error_messages.html.erb (1.9ms)

The *member model *includes:

belongs_to :organization
validates :organization_id, presence: true # There are other
as well, but I don’t think they matter for this question.
def send_activation_email

Next, if I remove the validates :organization_id line from the member
model, the form works fine. It saves the organization, the member, as
as the organization_if for the member. However, I of course need the
validation as protection.
Any idea how I should move forward?

Op woensdag 29 april 2015 23:15:28 UTC+2 schreef [email protected]: