Rails 4.2: Unknown Attribute or Server Error in Log - ruby-on-rails

Question

I have a form with a select_tag and options_from_collection_for_select that I can't seem to get to pass. In the view, when the upload id is set to uploadzip_id I get a 302 redirect and when it's set to uploadzip_ids, I get a Unknown Attribute error.
I'm a bit confused as I have my relationship set up along with the foreign key. I do have another model with checkboxes called Uploadpdf that works fine.
Here is the set up..
class Campaign < ActiveRecord::Base
has_one :uploadzip
end
class Uploadzip < ActiveRecord::Base
belongs_to :campaign
end
db/schema.rb
create_table "campaigns", force: :cascade do |t|
t.string "name"
t.text "comment"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
create_table "uploadzips", force: :cascade do |t|
t.string "file_name"
t.string "file_type"
t.datetime "date"
t.integer "size"
t.integer "pages"
t.string "file_ident"
t.string "md5"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "campaign_id"
end
add_foreign_key "uploadzips", "campaigns"
app/controllers/campaign_controller.rb
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
.....
private
def campaign_params
params.require(:campaign).permit(:name, :comment, :uploadzip_ids, uploadpdf_ids: [])
end
end
views/campaigns/_form.rb
<%= form_for #campaign, url: {action: "create"} do |f| %>
.....some typical fields..
<%= f.label :data_file, class: "right-label" %>
<%= select_tag campaign[uploadzip_ids],
options_from_collection_for_select(
Uploadzip.all, :id, :file_name
), { include_blank: "Include a Zip File" } %>
.....some more typical fields
<% end %>
Update
I have changed the code to better reflect the foreign key as suggested. Creating a campaign is now successful but it's not associating with the chosen uploadzip Zip file selected. When calling #campaign.uploadzip, it returns nil.
Here is the updated code:
<%= select_tag "uploadzip[campaign_id]",
options_from_collection_for_select(
Uploadzip.all, :id, :file_name
), { include_blank: "Include a Zip File" } %>
I also changed the controller params.require to..
def campaign_params
params.require(:campaign).permit(:name, :comment, :campaign_id, uploadpdf_ids: [])
end

Answer 1

As per your association set-up,the foreign_key should be campaign_id not uploadzip_id. You should either change your associations or foreign_key according to your use-case.
And also I recommend you to follow these Guides to know more about associations.

Answer 2

The 302 redirect may not be a bad thing, since you're doing a redirect_to new_campaign_path. Are the records created correctly when you use uploadzip_id in both the view and controller params.permit section?

Answer 3

Member of a FaceBook group helped me figure it out by adding a little
extra logic in the controller..
if #campaign.save
zip = Uploadzip.find(params[:uploadzip_id])
zip.campaign = #campaign
zip.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
..which was met with changing the select_tag's name.
<%= select_tag :uploadzip_id,
options_from_collection_for_select(
Uploadzip.all, :id, :file_name
), { include_blank: "Include a Zip File" } %>