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After spending many hours trying to get FreeTDS and unixodbc to run on a Mac OS X 10.8 system with the python module, pyodbc, I eventually came to this recipe, which is remarkably simple thanks to homebrew. I also found unixodbc was unnecessary and I couldn't get it to play well with FreeTDS, so this install does not include unixodbc. See also http://www.acloudtree.com/how-to-install-freetds-and-unixodbc-on-osx-using-homebrew-for-use-with-ruby-php-and-perl/ and http://www.cerebralmastication.com/2013/01/installing-debugging-odbc-on-mac-os-x/.

Prerequisites: Be sure you have XCode and the Commandline Tools for XCode installed from Apple. Also install homebrew followed with brew update and brew doctor.

Install FreeTDS:

brew install freetds

Test your install:

	# This solution was based on https://gist.github.com/GlenCrawford/16163abab7852c1bd550547f29971c18

	Rails.configuration.to_prepare do
	ActiveRecord::SchemaDumper.ignore_tables = %w[
	salesforce._hcmeta
	salesforce._sf_event_log
	salesforce._trigger_log
	salesforce._trigger_log_archive
	]
	end

	# This script automatically reserves Wilson weightlifting slots.
	# usage: python GymScheduler.py --day=monday --startTime=9:20AM
	# use cron (unix) or TaskScheduler (windows) to get this to run automatically 48 hours before
	# you need selenium webdriver for chrome and selenium python bindings installed.

	from selenium import webdriver
	from selenium.webdriver.support.ui import WebDriverWait
	from selenium.webdriver.support import expected_conditions as EC
	from selenium.webdriver.common.by import By
	import sys, getopt

	# Overrides Rails file activerecord/lib/active_record/schema_dumper.rb to
	# include all schema information in the db/schema.rb file, for example, in the
	# create_table statements. This allows for a working development database
	# to be built from a schema.rb file generated by rake db:schema:dump.
	#
	# This is essentially a rebuild of the "schema_plus_multischema" gem (which is
	# unfortunately only compatible with Rails ~> 4.2).
	#
	# Tested with Rails 6.0.

	# Variant 1
	def user_params(type)
	params.require(type.to_sym).permit(attributes)
	end

	# Variant 2
	def user_params(type)
	case type
	when "user"
	params.require(:user).permit(user_attributes)