Creating multiple model objects if they do not exist? - ruby-on-rails

Question

Models:
Store - id, name
Source - id, name
User - id, name
StoreUser - store_id, user_id
StoreSourceDeduction - store_id, source_id
StoreSourceRevenue - store_id, source_id
Transaction - store_id, source_id, deduction:boolean, user_id, amount, submitted_at, created_at, updated_at
(StoreSource split into Deduction and Revenue to make use of the Nested Form Fields gem)
I have routes set up as such: /transactions/:store_id/:date
When navigating to /transactions/1/08112017, if there are no records in the Transaction model for that date, I need to create a row in the Transaction table for each of the StoreSourceDeduction and StoreSourceRevenue models for store 1 and display a form for each record's amount field.
From the Transaction controller, how do I create multiple new Transaction objects while automatically populating the store_id, user_id, deduction, source_id fields, and how do I recall them to allow edits?
EDIT
I believe I solved the creation of objects:
class TransactionsController < ApplicationController
before_action :set_transactions, only: [:show, :edit, :update, :destroy]
before_action :set_store, only: [:store]
before_action :get_sources, only: [:show]
before_action :check_date, only: [:show]
# GET /transactions
# GET /transactions.json
def index
#transactions = Transaction.all
end
def store
end
# GET /transactions/1
# GET /transactions/1.json
def show
if is_today?
if #transactions.count == 0
#deductions.each do |d|
row = Transaction.new(:store_id => params[:store_id],
:source_id => d.source_id,
:user_id => current_user.id,
:deduction => true)
row.save
end
#revenues.each do |r|
row = Transaction.new(:store_id => params[:store_id],
:source_id => r.source_id,
:user_id => current_user.id,
:deduction => false)
row.save
end
end
end
end
# GET /transactions/1/edit
def edit
end
# POST /transactions
# POST /transactions.json
def create
end
# PATCH/PUT /transactions/1
# PATCH/PUT /transactions/1.json
def update
respond_to do |format|
if #transaction.update(transaction_params)
format.html { redirect_to #transaction, notice: 'Transaction was successfully updated.' }
format.json { render :show, status: :ok, location: #transaction }
else
format.html { render :edit }
format.json { render json: #transaction.errors, status: :unprocessable_entity }
end
end
end
# DELETE /transactions/1
# DELETE /transactions/1.json
def destroy
#transaction.destroy
respond_to do |format|
format.html { redirect_to transactions_url, notice: 'Transaction was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_transactions
#transactions = Transaction.where("store_id = :store_id AND date = :date",
{store_id: params[:store_id], date: params[:transaction_date]})
end
def set_store
#transactions = Transaction.where("store_id = :store_id",
{store_id: params[:store_id]})
end
def is_today?
date = params[:transaction_date]
today = Date.today().strftime('%m%d%Y')
date == today
end
def check_date
#date = Transaction.where("date = :date", {date: params[:date]})
end
def get_sources
#deductions = StoreSourceDeduction.where("store_id = :store_id", {store_id: params[:store_id]})
#revenues = StoreSourceRevenue.where("store_id = :store_id", {store_id: params[:store_id]})
end
# Never trust parameters from the scary internet, only allow the white list through.
def transaction_params
params.require(:transaction).permit(:store_id, :user_id, :source_id, :amount, :submitted_at)
end
end