Nested forms with join table attributes - ruby-on-rails

Question

I have a new Match form:
EDIT:
= form_for(#match) do |f|
= f.label :match_date
= f.date_select :match_date, :order => [:day, :month, :year]
= f.label :player_ids, 'Select players'
= f.collection_select :player_ids, #players, :id, :lastname, {}, { multiple: true }
= f.fields_for :match_edits do |ff|
= ff.label :result
= ff.number_field :result, in: 0..10
%div
= f.button :submit
When I choose two players I want set for each one match result like this:
id: 1, match_id: 1, player_id: 1, result: 4
id: 2, match_id: 1, player_id: 2, result: 10
I'm new in rails and I don't know how to fix that
MatchController
class MatchesController < ApplicationController
respond_to :html
def index
#matches = Match.all
end
def show
#match = Match.find(params[:id])
#results = #match.match_edits
end
def new
#match = Match.new
#players = Player.all
2.times {#match.match_edits.build}
end
def create
#match = Match.new(match_params)
respond_to do |format|
if #match.save
format.html { redirect_to #match, notice: 'Match was successfully created.' }
format.json { render :show, status: :created, location: #match }
else
format.html { render :new }
format.json { render json: #match.errors, status: :unprocessable_entity }
end
end
end
private
def match_params
params[:match].permit :match_date, player_ids: [], :match_edits_attributes => [:id, :result]
end
end
MatchEdit model
class MatchEdit < ActiveRecord::Base
belongs_to :match
belongs_to :player
end
Match model
class Match < ActiveRecord::Base
has_many :match_edits
has_many :players, through: :match_edits
accepts_nested_attributes_for :match_edits, allow_destroy: true, reject_if: proc { |attrs| attrs['result'].blank? }
end
Schema.rb
ActiveRecord::Schema.define(version: 20150629144534) do
create_table "match_edits", force: :cascade do |t|
t.integer "match_id"
t.integer "player_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.integer "result"
end
add_index "match_edits", ["match_id"], name: "index_match_edits_on_match_id"
add_index "match_edits", ["player_id"], name: "index_match_edits_on_player_id"
create_table "matches", force: :cascade do |t|
t.date "match_date"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "players", force: :cascade do |t|
t.string "firstname"
t.string "lastname"
t.string "picture"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
end

Answer 1

You need to update your form to remove redundant code i.e.:
= ff.number_field :result, in: 0..10
Your form will look like:
= form_for(#match) do |f|
= f.label :match_date
= f.date_select :match_date, :order => [:day, :month, :year]
= f.label :player_ids, 'Select players'
= f.collection_select :player_ids, #players, :id, :lastname, {}, { multiple: true }
= f.fields_for :match_edits do |ff|
= ff.label :result
= ff.number_field :result, in: 0..10
%div
= f.button :submit
Your controller's new method is responsible to to provide multiple fields for result:
class MatchsController << ApplicationContoller
...
def new
...
2.times { #match.match_edits.build }
...
end
...
end
Your model should allow to accept nested attributes as following:
class Match
...
has_many :match_edits
accepts_nested_attributes_for :match_edits, allow_destroy: true,
reject_if: proc { |attrs| attrs['result'].blank? }
...
end
class MatchEdit
...
belongs_to :match
...
end

Answer 2

I found solution. Form should look like this:
= form_for(#match) do |f|
= f.label :match_date
= f.date_select :match_date, :order => [:day, :month, :year]
= f.fields_for :match_edits do |ff|
= ff.label :player_id, 'Select player'
= ff.collection_select :player_id, #players, :id, :lastname, {}, { multiple: false }
= ff.label :result
= ff.number_field :result, in: 0..10
%div
= f.button :submit
and in matches_controller:
def match_params
params[:match].permit :match_date, :match_edits_attributes => [:id, :result, :player_id]
end