Player won't display that it is added - html

Question

I'm trying to add a new player but it won't display and i keep getting a rollback. I've tried using hidden_field for my user_id but it didn't seem to do anything. Are there any other alternatives of doing this? I'm pretty sure its something so small that I have to change. Please help.
Player controller:
def new
#players = Player.new
end
def create
#players = Player.create(user_id: params[:player][:user_id], first_name: params[:player][:first_name], last_name: params[:player][:last_name], position: params[:player][:position], favorite_team: params[:player][:favorite_team], extra_equipment: params[:player][:extra_equipment], bio: params[:player][:bio])
redirect_to players_path
end
player new:
<h1>Add a new Player</h1>
<%= form_for #players do |f| %>
<p>First Name <%= f.text_field :first_name %></p>
<p>Last name <%= f.text_field :last_name %></p>
<p>Position <%= f.text_field :position %></p>
<p>Favorite Team(optional) <%= f.text_field :favorite_team %></p>
<p>Extra Equipment <%= f.text_field :extra_equipment %></p>
<p>Bio <%= f.text_field :bio %></p>
<%= f.hidden_field :user_id %>
<%= submit_tag "Add"%>
<% end %>
Player Model
class Player < ApplicationRecord
belongs_to :user
has_many :pickup, through: :player_pickup
end

Answer 1

For crud (Create, Update, Retrieve & Destroy) use #player, not #players.
Also, call your params from a private method instead calling it directly, this is a DRY concept in rails.
So it would be somehow like this (example):
def new
#player = Player.new
end
def create
#player = Player.new(player_params)
if #player.save
// Do something
else
// Do something
end
end
private
def player_params
params.require(:player).permit(:param_1, :param_2 .... etc)
end
Then in your view use form_for #player

Answer 2

You aren't passing a value into the hidden field. You should be doing something like
<%= f.hidden_field :user_id, value: current_user.id %>
If the user_id is always the current_user - you don't need a field, you can just assign it in the controller.
def create
#players = Player.create(first_name: params[:player][:first_name], last_name: params[:player][:last_name], position: params[:player][:position], favorite_team: params[:player][:favorite_team], extra_equipment: params[:player][:extra_equipment], bio: params[:player][:bio])
#players.user_id = current_user.id
#players.save
redirect_to players_path
end
Or - if you want to keep the same formatting
def create
#players = Player.create(user_id: current_user.id, first_name: params[:player][:first_name], last_name: params[:player][:last_name], position: params[:player][:position], favorite_team: params[:player][:favorite_team], extra_equipment: params[:player][:extra_equipment], bio: params[:player][:bio])
redirect_to players_path
end