Rails4 Displaying Nested Form saves only one row - ruby-on-rails

Question

I need a form that allows users to accept 4 set of inputs to invite four users into an entity. The following is the code.
# GET /company_members/new
def new
#company_member = CompanyMember.new
#company_member.company_members.build
end
# POST /company_members
# POST /company_members.json
def create
#company_member = CompanyMember.new(company_member_params)
#company_member.user_id = 1
#company_member.company_id = 1
respond_to do |format|
if #company_member.save
format.html { redirect_to #company_member, notice: 'Company member was successfully created.' }
format.json { render action: 'show', status: :created, location: #company_member }
else
format.html { render action: 'new' }
format.json { render json: #company_member.errors, status: :unprocessable_entity }
end
end
end
Form:
<%= form_for(#company_member) do |f| %>
<!--<% if #company_member.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#company_member.errors.count, "error") %> prohibited this company_member from being saved:</h2>
<ul>
<% #company_member.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>-->
<%= f.fields_for #company_member do |yes| %>
email: <%= yes.text_field :email %> role: <%= yes.collection_select :company_member_role_id, CompanyMemberRole.all, :id, :name, :prompt => "Please select" %>
<% end %><br>
<%= f.fields_for #company_member do |yes| %>
email: <%= yes.text_field :email %> role: <%= yes.collection_select :company_member_role_id, CompanyMemberRole.all, :id, :name, :prompt => "Please select" %>
<% end %><br>
<%= f.fields_for #company_member do |yes| %>
email: <%= yes.text_field :email %> role: <%= yes.collection_select :company_member_role_id, CompanyMemberRole.all, :id, :name, :prompt => "Please select" %>
<% end %>
<div class="field">
<%= f.label :email %>
<%= f.text_field :email %>
<%= show_errors(#company_member, :email) %>
</div>
<!--<div class="field">
<%= f.label :company_id %><br>
<%= f.collection_select :company_id, Company.all, :id, :name %>
</div>-->
<div class="field">
<%= f.label :company_member_role_id %>
<%= f.collection_select :company_member_role_id, CompanyMemberRole.all, :id, :name, :prompt => "Please select" %>
<%= show_errors(#company_member, :company_member_role_id) %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
It just saves one Row in the Database while it has to save 4 rows. Also is there a way to remove the un filled rows if any?