app.rb

require 'lib/cleared_check'
require 'rubygems'
require 'fastercsv'
require 'sinatra'
require 'json'


@@cleared_checks = []
FasterCSV.foreach('data/cleared_checks.csv', :headers => true) do |line|
  @@cleared_checks << ClearedCheck.new(line)
end

get '/search' do 
  content_type :json
  @matching_checks = []
  if params[:amount]
    amount = (params[:amount].to_f * 100).round
    @matching_checks = @@cleared_checks.select{|check| check.amount == amount}
  end
  if params[:check_number]
    check_number = params[:check_number]
    if @matching_checks.size > 0
      @matching_checks = @matching_checks.select{|check| check.check_number == check_number}
    elsif
      @matching_checks = @@cleared_checks.select{|check| check.check_number == check_number }
    end
  end
  @matching_checks.to_json
end

cleared_check.rb

class ClearedCheck 
    
  attr_accessor :amount,:check_number,:account,:posted_on,:sequence,:image_location,:image_offset,:image_length,:image_type
  
  def initialize options
    @amount = options["amount"].gsub(",","").to_f*100.round
    @check_number = options["check_number"]
    @posted_on = Date.parse(options["posted_on"])
  end
  
  def to_json(options)
    { :amount => @amount/100,
      :check_number => @check_number,
      :posted_on => @posted_on }.to_json
  end
  
end