Rails create does not save params from checkbox - ruby-on-rails

Question

I am creating a website where a user (interviewer) can create a position (a job opening).
Even if the params are sent, my create action does not save them except for the current_user.
This is what I send:
positions_controller.rb
def new
#position = Position.new
end
def create
#position = Position.new(position_params)
#position.interviewer = current_interviewer
if #position.save
redirect_to position_path(#position)
flash[:success] = "You created a new position/opening"
else
render :new
end
raise
end
private
def set_position
#position = Position.find(params[:id])
end
def position_params
params.require(:position).permit(:title, :skills, :interviewer)
end
end
_form.html.erb
<%= simple_form_for [#interviewer, #position] do |f| %>
<%= f.input :title, required:true %>
<%= f.input :skills, as: :check_boxes, collection:[
['Python', "python"],
['Java', "java"],
['JavaScript', "javascript"],
['Ruby', "ruby"],
['C++', "c++"],
['Node.js', "node"],
['React', "react"],
['Django', "django"],
['Rails', "rails"],
['SQL', "sql"],
['Doker', "doker"],
['AWS', "aws"],
['Vue.js', "vue"],
['Marketing', "Marketing"],
['HR', "hr"],
['Finance', "finance"],
['IT', "it"],
], input_html: { multiple: true } %>
<%= f.submit "Submit position", class: "btn btn-primary" %>
<% end %>
position.rb
class Position < ApplicationRecord
validates :title, presence: true
belongs_to :interviewer
end
schema
create_table "positions", force: :cascade do |t|
t.string "title"
t.bigint "interviewer_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.bigint "candidate_id"
t.string "candidatures", default: [], array: true
t.string "skills"
t.index ["candidate_id"], name: "index_positions_on_candidate_id"
t.index ["interviewer_id"], name: "index_positions_on_interviewer_id"
end
My alternative was to replace the create code with:
#position = current_interviewer.positions.new(position_params)
but it still does not work.

Answer 1

Since you have a input_html: { multiple: true } for the params skills, you need to add the following in positions_controller.rb:
def position_params
params.require(:position).permit(:title, :interviewer, :candidate, skills:[])
end
Basically, your skills will be saved as an array if you allow input_html: { multiple: true } for a collection
In addition, you are not passing any params for candidate

Answer 2

In your table, you have interviewer_id but in your permitted params you have interviewer.
Change your params to permit interviewer_id instead.
Also, in your form you have <%= f.input :title, required:true %> Presence is required by default (at least with simple_form). You don't need to declare it in the form, but you should still keep it in your Model.