Fix ambiguous column id when using Relation instead of Builder

[fabio-ivona]

@rappasoft I noticed a slight issue when using bulk actions with a many to many Relation to generate data:

if the pivot table has an id field, the query will generate an integrity constraint violation when using the id column to filter data:

SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'id' in field list is ambiguous (SQL: select `id` from `students` inner join `subscriptions` on `students`.`id` = `subscriptions`.`student_id` where `subscriptions`.`edition_id` = 3 and `students`.`id` in (3) order by `students`.`last_name` asc)

this happens when executing the WithBulkActions::selectedRowsQuery() and WithBulkActions::selectedKeys() methods and can be avoided by letting laravel to qualify the primaryKey column:

$this->primaryKey //id

would become:

$query->qualifyColumn($this->primaryKey) //students.id

this is a very rare case, but could happen

[fabio-ivona]

@rappasoft seems that automatic tests are cancealed by some github policy

[rappasoft]

Was there a reason you removed this one? Also, is there qualifyColumn documentation?

[fabio-ivona]

damn, I forgot to undo it, it was a try because I noticed that the test I wrote was succeeding with the old code. so I put the PR in draft while was writing a better test

just fixing it

[fabio-ivona]

anyway, qualifyColumn is not documented in official Laravel documentation, it was released with laravel 5.5.29:

https://laravel-news.com/laravel-5-5-29-released

but it simply does this:

public function qualifyColumn($column)
{
  return $this->model->qualifyColumn($column);
}

and Model::qualifyColumn() adds the table name before the column name:

public function qualifyColumn($column)
{
    if (Str::contains($column, '.')) {
        return $column;
    }

    return $this->getTable().'.'.$column;
}

[fabio-ivona]

@rappasoft I just rewrote my test table and RelationshipDatatableComponentTest in order to have an example that gives an error without this PR and it is fixed by adding qualifyColumn()