Access another models attributes through has_many - ruby-on-rails

Question

I'm looking to be able to call the values from another table this way in the view.
<%= #team.r1.players.full_name %>
<%= #team.r2.players.full_name %>
...
<%= #team.r2.players.full_name %>
r1 to r10 are columns that hold player IDs.
The models are pretty simple and look like this.
class Player < ApplicationRecord
has_and_belongs_to_many :teams
end
class Team < ApplicationRecord
belongs_to :user
has_many :players
end
The error that results is undefined method `players' for 3:Integer. I've attempted trying singular and plural versions to pull it but same error occurs. Looks like you might be able to do a join table but that wouldn't be ideal or doing a has_many :through association.
Schema
create_table "players", force: :cascade do |t|
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "full_name"
end
create_table "team_players", force: :cascade do |t|
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "teams", force: :cascade do |t|
t.bigint "user_id"
t.string "team_name"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "r1"
t.integer "r2"
t.integer "r3"
t.integer "r4"
t.integer "r5"
t.integer "r6"
t.integer "r7"
t.integer "r8"
t.integer "r9"
t.integer "r10"
t.index ["user_id"], name: "index_teams_on_user_id"
end
And I set up updating/adding players on a team this way.
<%= f.collection_select(:r1, Player.all, :id, :full_name , {required: true, include_blank: false}, {class: 'uk-input'}) %>

Answer 1

As ConorB said in comments, the r1, r2, etc. bit seems weird. If you want to limit the number of players on a team, I would suggest you do that in code, not in your data structures.
As a note: In your Team model you say:
class Team < ApplicationRecord
belongs_to :user
has_many :players
end
According to the docs:
A has_many association indicates a one-to-many connection with another model.
This is not your case. You have a many-to-many cardinality between Team and Player. So, using has_many without through is a mistake in your case.
What you should have is:
class Player < ApplicationRecord
has_many :team_players
has_many :teams, through: :team_players
end
class Team < ApplicationRecord
has_many :team_players
has_many :players, through: :team_players
end
class TeamPlayer < ApplicationRecord
belongs_to :team
belongs_to :player
end
And then do:
<% #team.players.each do |player| %>
<%= player.full_name %>
<% end %>
You could decide to use has_and_belongs_to_many, in which case you would need a teams_players table, but no TeamPlayer model. (Personally, I never use HABTM, but that's a purely personal preference.) See the guide for more information.