I have a feeling I am gonna get my ass kicked here, but this is my first 
attempt at creating real life model logic

I have 3 models: 

  Trader - 
https://github.com/JonleePeakman/locations/blob/master/app/models/trader.rb 

  Service -
https://github.com/JonleePeakman/locations/blob/master/app/models/service.rb
 

  Location -
https://github.com/JonleePeakman/locations/blob/master/app/models/location.rb


and my DB Schema is: 
https://github.com/JonleePeakman/locations/blob/master/db/schema.rb


This is all I have at the moment and it does exactly what I want it to do. 
 I will plan on my controller and views later but I want to pause and 
review on my work and could use some help as I am unsure if I am overusing 
callbacks especially in the Service model and what I could do otherwise.


A quick overview of the plan is:

A Trader has and belongs to many Locations and vice-versa, and a Trader has 
many Services each of which have a range.  This range is the distance a 
trader may travel to provide the service from their central post_code e.g. 
a builder might travel 20 miles to build a porch but would travel 50 miles 
for a customer to build a full house extension.  Therefore the Locations 
for a Trader all hinge on the maximum range of their Services.  


The Locations table is populated with UK postcode data with Lat/Lon 
coordinates and all distances and ranges are calculated using the Haversine 
formula.


The plan is when a User visits the website they enter their post code, 
firstly all Traders in the Location will be identified.  Then When the user 
clicks on a specific Trader, the Trader=>'services_in' function will be 
called to only show the services that the trader provides within their post 
code.


I hope that makes sense and you have a little time to peruse the models, I 
could really do with having a discussion on what I have created so far to 
see how smelly my code is.  As I say I have never done anything to this 
level before.


much regards


JL

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