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Full error message I am getting:

ErrorException [ 4096 ]: Object of class Uploader\Model_Category could not be converted to string
The code that is causing this:

$offer = new Model_Offer();
$offer->category = new Model_Category();

$offer->save();

Not sure why it's throwing this error - I thought this error was related to passing ORM data to a view? Thanks

Fuel v1.2
Model is extending \Orm\Model in a module

COREPATH/bootstrap.php @ line 48

43});
44
45set_error_handler(function ($severity, $message, $filepath, $line)
46{
47    load_error_classes();
48    return \Error::error_handler($severity, $message, $filepath, $line);
49});
50
51function setup_autoloader()
52{
53    Autoloader::add_namespace('Fuel\\Core', COREPATH.'classes/');

COREPATH/classes/database/connection.php @ line 471

466                return $value->value();
467            }
468            else
469            {
470                // Convert the object to a string
471                return $this->quote((string) $value);
472            }
473        }
474        elseif (is_array($value))
475        {
476            return '('.implode(', ', array_map(array($this, __FUNCTION__), $value)).')';

COREPATH/classes/database/query/builder/insert.php @ line 168

163                        // Use the parameter value
164                        $group[$i] = $this->_parameters[$value];
165                    }
166                }
167
168                $groups[] = '('.implode(', ', array_map($quote, $group)).')';
169            }
170
171            // Add the values
172            $query .= 'VALUES '.implode(', ', $groups);
173        }

COREPATH/classes/database/query.php @ line 228

223            // Get the database instance
224            $db = \Database_Connection::instance($db);
225        }
226
227        // Compile the SQL query
228        $sql = $this->compile($db);
229
230        switch(strtoupper(substr($sql, 0, 6)))
231        {
232            case 'SELECT':
233                $this->_type = \DB::SELECT;

PKGPATH/orm/classes/query.php @ line 1145

1140     */
1141    public function insert()
1142    {
1143        $res = \DB::insert(call_user_func($this->model.'::table'), array_keys($this->values))
1144            ->values(array_values($this->values))
1145            ->execute($this->connection);
1146
1147        // Failed to save the new record
1148        if ($res[0] === 0)
1149        {
1150            return false;

PKGPATH/orm/classes/model.php @ line 1031

1026                $query->set($p, $this->{$p});
1027            }
1028        }
1029
1030        // Insert!
1031        $id = $query->insert();
1032
1033        // when there's one PK it might be auto-incremented, get it and set it
1034        if (count($primary_key) == 1 and $id !== false)
1035        {
1036            $pk = reset($primary_key);

PKGPATH/orm/classes/model.php @ line 975

970                }
971            }
972            $this->unfreeze();
973
974            // Insert or update
975            $return = $this->_is_new ? $this->create() : $this->update();
976
977            $this->freeze();
978            foreach($this->relations() as $rel_name => $rel)
979            {
980                if (array_key_exists($rel_name, $this->_data_relations))

APPPATH/modules/uploader/classes/controller/create.php @ line 105

100        $new_offer->modified_by = '1';
101        
102        // Set the required parameters for Category:
103        $new_offer->category->name = 'On the Fly Category';
104        
105        $new_offer->save();
106    }
107}