Rails Submitting Multiple Has_Many Attributes via Form - ruby-on-rails

Question

I am running a Rails 5.1 app with the following information:
Models
class Company < ApplicationRecord
has_many :complaints
accepts_nested_attributes_for :complaints
validates :name, presence: true
end
class Complaint < ApplicationRecord
belongs_to :company
validates :username, :priority, presence: true
end
Controller
class ComplaintController < ApplicationController
def new
#company = Company.new
#company.complaints.build
end
def create
#company = Company.new(company_params)
respond_to do |format|
if #company.save
format.html { redirect_to complaint_url }
else
format.html { render :new }
end
end
end
private
def company_params
params.require(:company).permit(:name, complaints_attributes: [:username, :priority])
end
Form in view
<%= form_for #company do |f| %>
<%= f.label :name, "Company" %>
<%= f.text_field :name, type: "text" %>
<%= f.fields_for :complaints do |complaint| %>
<%= complaint.label :username, "Username" %>
<%= complaint.text_field :username %>
<%= complaint.label :priority, "Priority" %>
<%= complaint.text_field :priority %>
<% end %>
<%= f.submit 'Submit' %>
<% end %>
If I have just one input field for the complaint_attributes part of the form (in other words just one field for username and one field for priority as shown above), this works just fine.
However, if I want to have multiple fields for username/priority in the form, so that I can submit multiple username/priority combinations in a single submission, I find that submitting the form will only save the last username/priority values from the form. Example of this view would be:
<%= form_for #company do |f| %>
<%= f.label :name, "Company" %>
<%= f.text_field :name, type: "text" %>
<%= f.fields_for :complaints do |complaint| %>
<div>
<%= complaint.label :username, "Username" %>
<%= complaint.text_field :username %>
<%= complaint.label :priority, "Priority" %>
<%= complaint.text_field :priority %>
</div>
<div>
<%= complaint.label :username, "Username" %>
<%= complaint.text_field :username %>
<%= complaint.label :priority, "Priority" %>
<%= complaint.text_field :priority %>
</div>
<% end %>
<%= f.submit 'Submit' %>
<% end %>
I noticed that when submitting the form, I get a hash like this (for submitting single complaint):
{"utf8"=>"✓", "authenticity_token"=>"...", "company"=>{"name"=>"Test", "complaints_attributes"=>{"0"=>{"username"=>"test_person", "priority"=>"1"}}}, "commit"=>"Submit"}
Is there any way to modify the params to make it similar to this and have it saved to the DB?:
{"utf8"=>"✓", "authenticity_token"=>"...", "company"=>{"name"=>"Test", "complaints_attributes"=>{"0"=>{"username"=>"test_person", "priority"=>"1"}"1"=>{"username"=>"test_person", "priority"=>"2"}}}, "commit"=>"Submit"}
Or if not the above, what would be the best way to have the username/priority values saved if using multiple fields for them in a single form?
EDIT: I should point out that I can dynamically add the username/priority field groups as needed, so I don't want to be restricted to a set number.

Answer 1

the second block will override the first fields... you should instead build many complaints in the controller:
def new
#company = Company.new
3.times { #company.complaints.build }
end
and then with the following form it should generate to inputs according to the number of complaints you have built:
<%= form_for #company do |f| %>
<%= f.label :name, "Company" %>
<%= f.text_field :name, type: "text" %>
<%= f.fields_for :complaints do |complaint| %>
<%= complaint.label :username, "Username" %>
<%= complaint.text_field :username %>
<%= complaint.label :priority, "Priority" %>
<%= complaint.text_field :priority %>
<% end %>
<%= f.submit 'Submit' %>
<% end %>