task.rb

 class Task
   DB = PG.connect :hostaddr => "127.0.0.1", :port => 5432, :dbname => 'testdb', :user => "postgres", :password => "postgres"
   #uncomment while deploying to heroku
   #DB = PG.connect ENV["HEROKU_POSTGRESQL_SILVER_URL"]
   # uncomment to create pg database
   # DB = PG.connect(hostaddr: "127.0.0.1", port: 5432, dbname: 'postgres', user: 'postgres', password: "postgres")
   # DB.exec("CREATE DATABASE testdb")

   # uncomment to create table
   # DB.exec "DROP TABLE IF EXISTS tasks"
   # DB.exec "CREATE TABLE tasks(Id SERIAL PRIMARY KEY, Name VARCHAR(20), Finished INT)"

   class << self
     def all()
       DB.exec("select * from tasks")
     end

     def update(task, finish, id)
       DB.exec("UPDATE tasks set name = '#{task}', finished = '#{finish}' where id='#{id}'")
     end

     def save(task_name)
       DB.exec("INSERT INTO tasks (name, finished) VALUES ('#{task_name}',0)")
     end

     def delete(id)
       DB.exec("delete from tasks where id='#{id}'")
     end

     def where(id)
       DB.exec("select * from tasks where id = '#{id}'")
     end
   end

 end