Rails 4 belongs_to/has_many relationship not working - ruby-on-rails

Question

I've managed to get a few HABTM relationships set up without any problems, but for some reason I can't make a belongs_to/has_many relationship record the values.
An Article belongs_to a Type (news, editorial, chronicle, etc.)
A Type has_many Articles
Schema.db shows the type_id integer column, the models use belongs_to and has_many and a drop down of article types appears in the form on the new/edit article pages.
But on choosing a type from the drop down (e.g. 'chronicle'), it says it creates or edits the article successfully but does not register the link between the article and 'chronicle'. On going back to edit the same article, the drop down just shows the top type ('analysis'), not 'chronicle'.
So not sure where I'm going wrong. Here are all the relevant bits, starting with the database.
From schema.db:
create_table "articles", force: :cascade do |t|
t.string "headline"
t.string "lede"
t.text "body"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "type_id"
end
create_table "types", force: :cascade do |t|
t.string "name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
Then the models:
class Article < ActiveRecord::Base
has_and_belongs_to_many :categories
has_and_belongs_to_many :regions
has_and_belongs_to_many :stories
belongs_to :type
end
class Type < ActiveRecord::Base
has_many :articles
end
And the articles controller:
# GET /articles/new
def new
#article = Article.new
#regions = Region.all.order(:region)
#categories = Category.all.order(:category)
#stories = Story.all.order(:story)
#types = Type.all.order(:name)
end
# GET /articles/1/edit
def edit
#regions = Region.all.order(:region)
#categories = Category.all.order(:category)
#stories = Story.all.order(:story)
#types = Type.all.order(:name)
end
# POST /articles
# POST /articles.json
def create
#article = Article.new(article_params)
respond_to do |format|
if #article.save
format.html { redirect_to #article, notice: 'Article was successfully created.' }
format.json { render :show, status: :created, location: #article }
else
format.html { render :new }
format.json { render json: #article.errors, status: :unprocessable_entity }
end
end
end
/* …and then at the bottom… */
def article_params
params.require(:article).permit(:headline, :lede, :body, :category_ids => [], :region_ids => [], :story_ids => [], :type_id => [])
end
And finally in the articles form:
<strong>Type:</strong> <%= f.collection_select :type_id, #types, :id, :name %>
Any ideas?

Answer 1

You need to change the article_params to below
def article_params
params.require(:article).permit(:headline, :lede, :body, :type_id, :category_ids => [], :region_ids => [], :story_ids => [])
end
Notice the change :type_id => [] to :type_id

Answer 2

As there will be only one type_id in each articles record, your required params should not contain array of type_id. so change it to only :type_id instead of :type_id => []
def article_params
params.require(:article).permit(:headline, :lede, :body, :type_id, :category_ids => [], :region_ids => [], :story_ids => [])
end