[Rails-core] select_tag is not saving associated child-object

[Josh Shroy]

I have a form with a select_tag and options_from_collection_for_select that 
I can't seem to get to pass. The parent object, Campaign, saves but does 
not associate with the child-object Uploadzip.

Campaign has_one Uploadzip Uploadzip belongs_to Campaign

There's also the campaign_id foreign_key on the Uploadzips table.

Here's my Campaign controller:

class CampaignsController < ApplicationController
    def index
      @campaigns = Campaign.all.order("created_at DESC")
    end

    def new
      @campaign = Campaign.new
    end

    def create
      @campaign = Campaign.new(campaign_params)

      if @campaign.save
        flash[:success] = "Campaign Successfully Launched!"
        redirect_to @campaign
      else
        flash[:error] = "There was a problem launching your Campaign."
        redirect_to new_campaign_path
      end
    end

    def show
      @campaign = Campaign.includes(:uploadzip,:uploadpdfs).find(params[:id])
    end

  private

    def campaign_params
      params.require(:campaign).permit(:name, :comment, 
:campaign_id,uploadpdf_ids: [])
    endend

....and the form...

<%= form_for @campaign, url: {action: "create"} do |f| %>
    .....some typical fields..
    <%= f.label :data_file, class: "right-label" %>
    <%= select_tag "uploadzip[campaign_id]",                
options_from_collection_for_select(                Uploadzip.all, :id, 
:file_name                ), { include_blank: "Include a Zip File" } %>

    .....some more typical fields
<% end %>

Any help would be highly appreciated!

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