When I add has_many, some data is suddently not saved - ruby-on-rails

Question

I have 3 models, Challenge, Pun, User (managed by Clearance gem)
A User can create a Challenge. A Challenge contains many puns. A User can also create a Pun.
Everything is fine until I set a Pun to belong_to a User, then suddenly Puns are no longer saved.
class User < ApplicationRecord
include Clearance::User
has_many :challenges
has_many :puns
end
class Challenge < ApplicationRecord
has_many :puns, :dependent => :delete_all
belongs_to :user
end
class Pun < ApplicationRecord
belongs_to :challenge
belongs_to :user
end
In my PunController I have tried to establish the current_user id
def create
#pun = #challenge.puns.create(pun_params)
#pun.user_id = current_user.id if current_user
redirect_to #challenge
end
private
def set_challenge
#challenge = Challenge.find(params[:challenge_id])
end
def pun_params
params[:pun].permit(:pun_text,:user_id)
end
What am I doing wrong? I'm trying to keep it as simple as possible, but seems like Users don't want to be associated with more than one thing, particularly if nested. Is this a Clearance issue?
DB setup:
create_table "challenges", force: :cascade do |t|
t.text "title"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.datetime "start_time"
t.datetime "end_time"
t.bigint "user_id"
t.index ["user_id"], name: "index_challenges_on_user_id"
end
create_table "puns", force: :cascade do |t|
t.text "pun_text"
t.bigint "challenge_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.bigint "user_id"
t.index ["challenge_id"], name: "index_puns_on_challenge_id"
t.index ["user_id"], name: "index_puns_on_user_id"
end
create_table "users", force: :cascade do |t|
t.string "name"
t.string "email"
t.string "tagline"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "encrypted_password", limit: 128
t.string "confirmation_token", limit: 128
t.string "remember_token", limit: 128
t.index ["email"], name: "index_users_on_email"
t.index ["remember_token"], name: "index_users_on_remember_token"
end

Answer 1

Well in you currrent code you don't save user_id after setting it. And if you do not expect creation to fail you can do "create!".
So you can try:
def create
#challenge.puns.create!(pun_params.merge(user_id: current_user.id))
redirect_to #challenge
end

Answer 2

You can do this using simply hidden_field like in the form
<%= object.hidden_field :user_id, value: current_user.id %>
it won't work without user session because the relationship does not optional, and remove this line from the controller
#pun.user_id = current_user.id if current_user
and redirect
redirect_to #pun
it will work