Using a join() method in Laravel 5.1?

I'm using Laravel 5.1 and I want to run a model that can join two tables together.

So I have a Market and a People model plus also a TableRelation to link tables. The first two are just IDs and names while the TableRelation has the following schema

• id
• table_1_id
• table_1_model
• table_2_id
• table_2_model

(Note: this isn't to exclusively link the two tables mentioned but any number of tables in the DB)

Now I want to run the following query:

SELECT
    tr.*

FROM
    market
    
INNER JOIN
    table_relations AS tr ON ((
        tr.table_1_id = market.id
        AND tr.table_1_model = 'App\\Market'
    ) OR (
        tr.table_2_id = market.id
        AND tr.table_2_model = 'App\\Market'
    ))

But I want to be able to use it in the context of Eloquent so I can run code such as \App\Market::withRelation()->get(); or \App\Market::whereName('Clothing')->withRelation()->get(); (scopeWithRelation() being in a trait) but in an efficient manner. At the moment I would need to run three queries:

1. Query the model to get the results of selected rows
2. Use the results to then query TableRelation to get the model I want to query
3. Query the models based on results from TableRelation

But it would be more efficient if I could concatenate 1 and 2 like in my SQL example. I tried it with the following:

$query->join('table_relations', function($join) {
    $join->on('table_relations.table_1_id', '=', 'markets.id');
    $join->on('table_relations.table_1_model', '=', 'App\\Market');
})->select('table_relations.*');

But I believe join() was deprecated in version 5.* so I'm at a bit of a loss and feel there are only two options that are to loose the ability to chain Eloquent's build methods, or just run three queries every-time.

Any help would be amazing!