Nested Forms with find_or_create_by method - ruby-on-rails

Question

I've been stuck on this issue all day now and I'm fairly certain there is an easy fix that I am just not seeing due to my inexperience. A bit of background on what I'm trying to do before I discuss my problem. I have a model called Companies that can have many Locations. Similarly, a location can have multiple Companies. Because of this I created a has_many :through relationship.
class Company < ApplicationRecord
has_many :company_locations
has_many :locations, :through => :company_locations
accepts_nested_attributes_for :company_locations
accepts_nested_attributes_for :locations
end
class Location < ApplicationRecord
has_many :company_locations
has_many :companies, :through => :company_locations
end
class CompanyLocation < ApplicationRecord
belongs_to :company
belongs_to :location
end
Because of this structure, when a Company's location is created/updated I want to check whether this location (by name) exists. If it does, I use form the association between the Company and that Location. If it does not, the location is created and then the association is created. It is my understanding that the best way to do this is through a find_or_create_by method. However, the various ways I have tried do not seem to be creating this functionality.
Right now just to get something working my view for new Companies is this:
<h1> Add Company </h1>
<%= form_for :company, url: companies_path do |f| %>
<p>
<%= f.label :name %><br>
<%= f.text_field :name%>
</p>
<p>
<%= f.label :website %><br>
<%= f.text_field :website%>
</p>
<p>
<%= f.label :description %><br>
<%= f.text_area :description %>
</p>
<%=fields_for :locations do |location_form|%>
<%= location_form.label :name, 'Location' %>
<%= location_form.text_field :name %>
<%end%>
<p>
<%= f.submit %>
</p>
<% end %>
Now inside the create action in my Companies controller is where I am experiencing difficulties. As said before, I want to check if the location that is being added to the company already exists or not. Because of this, I am using a find_or_create_by method. However, I cannot seem to figure out how to properly handle the strong params/slice the params in a way to make this work without error.
def new
#company = Company.new
#company_locations = #company.company_locations.build
#location = #company_locations.build_location
end
def create
#company = Company.new(company_params)
#location = Location.find_or_create_by(name: (company_params.slice(:location_attributes[0][:name)))
#company.locations << #location
#company.save
redirect_to #company
end
private
def company_params
params.require(:company).permit(:name,:website, :description, location_attributes: [:name])
end
Currently, I'm getting an error saying 'no implicit conversion of Symbol into Integer' which leads me to believe that I am accessing the hash wrong, however, any other method I have tried results in the a Location being created with "NULL" set as the name. I'm really stumped on this one, and to completely honest I'm not sure I am approaching this nested form correctly. In the future, I hope to use JQuery/Javascript/Cocoon to be able to dynamically add fields in the form to add more locations at once. I've been trying to follow other Stack Overflow posts and forums to no avail. Any help/guidance is much appreciated! Thank you.
UPDATE
Still stuck on this one. Here is the params hash from the server log for an example company:
{"utf8"=>"✓",
"authenticity_token"=>"xpDOq6D5YRZ3VUXLBLgu8SfRIkRXgMQHXIRUtArNp1smtXShB/i54fQQVEHgqy64kdj1R+u0t/JVihLCXQVZpg==",
"company"=>{"name"=>"Google", "website"=>"www.google.com", "description"=>"Google is a search engine."},
"locations"=>{"name"=>"Mountain View"},
"commit"=>"Save Company"}
UPDATE 2
Params hash after Pavan's suggestions.
{"utf8"=>"✓",
"authenticity_token"=>"xJHZVYSfHmjR3BOMS49yRzwD35NV5F7uyCou8yOmtKAktGNfI57Gn1KZAgavnHIOigoIkOnQLRvBJGiFdG5KXQ==",
"company"=>{"name"=>"Logitech", "website"=>"www.logitech.com", "description"=>"This is logitech"},
"locations"=>{"name"=>"Chicago"},
"commit"=>"Save Company"}
UPDATE 3
Changed the form for tag to:
<%= form_for #company, url: companies_path do |f| %>
This is the new updated params hash:
{"utf8"=>"✓",
"authenticity_token"=>"UiiwNXzOiDqZd0Vv1dDu4jkyRQU4e9LKLixqKH+rvKCyDQo/289QzRoyVOUxw+6rjzuSBoRPoT8nIixeKGNCXQ==",
"company"=>{"name"=>"Seagate", "website"=>"www.seagate.com", "description"=>"This is seagate"},
"locations"=>{"name"=>"Los Angeles "},
"commit"=>"Create Company"}

Answer 1

I see a couple of mistakes
You need to build the associations correctly
def new
#company = Company.new
#company_locations = #company.company_locations.build
#location = #company.locations.build #since you have defined nested attributes in company
end
Change location_attributes to locations_attributes
def company_params
params.require(:company).permit(:name,:website, :description, locations_attributes: [:name])
end
And try using company_params.slice(:locations_attributes[0][:name])