Rails associated model id on create - ruby-on-rails

Question

I have 2 models, a sport model and a team model. The team model belongs_to :sport and the sport model has_many :teams.
Sport model:
class Sport < ActiveRecord::Base
has_many :teams
has_many :competitions
has_many :games
end
Team Model:
class Team < ActiveRecord::Base
belongs_to :sport
has_many :competition_teams
has_many :competitions, :through => :competition_teams
has_many :home_games, :foreign_key => "home_team_id", :class_name => "Game"
has_many :visiting_games, :foreign_key => "visiting_team_id", :class_name => "Game"
end
When a new team is created it must always associate with a sport. So for example if Hockey has an ID of 1, the team that is created under hockey must contain the sport ID. Below is the current schema:
create_table "sports", force: true do |t|
t.string "name"
t.datetime "created_at"
t.datetime "updated_at"
end
create_table "teams", force: true do |t|
t.string "name"
t.integer "sport_id"
t.datetime "created_at"
t.datetime "updated_at"
end
This is the teams controller:
class TeamsController < ApplicationController
before_action :set_team, only: [:show, :edit, :update, :destroy]
# GET /games
# GET /games.json
def index
#teams = Team.all
end
# GET /games/1
# GET /games/1.json
def show
end
# GET /games/new
def new
#team = Team.new
end
# GET /games/1/edit
def edit
end
# POST /games
# POST /games.json
def create
#team = Team.new(team_params)
respond_to do |format|
if #team.save
format.html { redirect_to #team, notice: 'team was successfully created.' }
format.json { render action: 'show', status: :created, location: #team }
else
format.html { render action: 'new' }
format.json { render json: #team.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /games/1
# PATCH/PUT /games/1.json
def update
respond_to do |format|
if #team.update(team_params)
format.html { redirect_to #team, notice: 'team was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: 'edit' }
format.json { render json: #team.errors, status: :unprocessable_entity }
end
end
end
# DELETE /games/1
# DELETE /games/1.json
def destroy
#team.destroy
respond_to do |format|
format.html { redirect_to sports_url }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_team
#team = Team.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def team_params
params[:team].permit(:name, :sport_id)
end
end
I tried to do the following in the routes:
resources :sports do
resources :teams
end
But get an error when trying to create a team from the the following URL: /sports/1/teams/new
The error is: undefined method `teams_path' for #<#:0x007fafb4b9b0c0>
app/views/teams/_form.html.erb where line #1 raised:

Answer 1

For your route setup:
resources :sports do
resources :teams
end
You will need to use new_sport_team_path which will map to sports/:sport_id/teams/:id/new.
And in your app/view/teams/_form.html.erb, since your route is sports/:sport_id/teams, your form_for declaration should be:
<%= form_for #comment, url: sport_teams_path ... %>
...
<% end %>
In this case sport_teams_path will route to /sports/:sport_id/teams with post method which will execute the create action in your TeamsController.
The form_for declaration above can also be written as:
<%= form_for([#sport, #team]) ... %>
...
<% end %>
In this case you'd need to define #sport and #team in your controller as follows:
# app/controllers/teams_controller.rb
def new
#sport = Sport.find(params[:sport_id])
#team = #sport.teams.build
...
end
For a list of routes defined in your application, you could run rake routes from within your application directory in the terminal.