add_location.html.erb

add_location.html.erb

 <tr>
                <td>          
                  <% if @group_locations.count >0 %>
                    <%= select_tag "group_providers", options_from_collection_for_select(GroupLocation.all, 'id' ,@group_locations.map{ |j| j.dba }), :multiple => true%>
                  <% else %>
                    <%= select_tag "group_providers", "<option>Add new...</option>".html_safe, :multiple => true, :style => "width: 300px" %>       
                  <% end %>
                    
                </td>
              </tr>

error question

I know the error is here:

<%= select_tag "provider_locations", options_from_collection_for_select(GroupLocation.all, 'group_location_id' ,@provider.provider_locations.map{ |j| j.id }), :multiple => true%>

I have to admit I found this code from another example online and tried to form it to fit my needs, but I have no idea what I am doing with that helper.... or map really 

I am trying to list all the group locations that the provider has under them.  Above are the models and relationships.

TypeError in Providers#add_location
Showing /vagrant/ipanmv2/app/views/providers/add_location.html.erb where line #51 raised:

["TestinGroupLocation Main Main"] is not a symbol nor a string
Extracted source (around line #51):
48
49
50
51
52
53
54
          
                 <tr>
                   <td>          
                     <% if @group_locations.count >0 %>
                       <%= select_tag "group_providers", options_from_collection_for_select(GroupLocation.all, 'dba' ,@group_locations.map{ |j| j.dba }), :multiple => true%>
                     <% else %>
                       <%= select_tag "group_providers", "<option>Add new...</option>".html_safe, :multiple => true, :style => "width: 300px" %>       
                     <% end %>

Rails.root: /vagrant/ipanmv2

Application Trace | Framework Trace | Full Trace
app/views/providers/add_location.html.erb:51:in `_app_views_providers_add_location_html_erb__410977632_88579590'
Request

Parameters:

{"id"=>"4"}
Toggle session dump
Toggle env dump
Response

Headers:

None

group_location.rb

class GroupLocation < ActiveRecord::Base  
  belongs_to :address
  belongs_to :group
  has_many :provider_locations
  
end

provider.rb

class Provider < ActiveRecord::Base

 	validates :first_name, presence: true
	validates :last_name, presence: true
	validates :provider_contact, presence: true

	has_many :provider_locations
	has_many :group_locations, through: :provider_locations
	has_many :groups, through: :group_locations	
	belongs_to :designation
	belongs_to :specialty
	#has_many :provider_locations
	has_many :invoices
	has_many :provider_terms
end

provider_location.rb

class ProviderLocation < ActiveRecord::Base
  belongs_to :provider  
  belongs_to :group_location

end