diff --git a/src/Common/EntityField.php b/src/Common/EntityField.php
index a9ce096..4847005 100644
--- a/src/Common/EntityField.php
+++ b/src/Common/EntityField.php
@@ -6,9 +6,10 @@ use Ulmus\Annotation\Annotation;
 use Ulmus\Migration\FieldDefinition;
 use Ulmus\Ulmus,
     Ulmus\Adapter\AdapterInterface,
-    Ulmus\Annotation\Property\Field;
+    Ulmus\Annotation\Property\Field,
+    Ulmus\Query\WhereRawParameter;
 
-class EntityField
+class EntityField implements WhereRawParameter
 {
     public string $name;
 
diff --git a/src/Common/EntityResolver.php b/src/Common/EntityResolver.php
index 8aef889..b973e5d 100644
--- a/src/Common/EntityResolver.php
+++ b/src/Common/EntityResolver.php
@@ -83,16 +83,6 @@ class EntityResolver {
                             throw new \InvalidArgumentException("Given `fieldKey` is unknown to the EntityResolver");
                     }
 
-                    if ($escape) {
-                        if ( isset($tag['object']->name) ) {
-                            $tag['object']->name = 2;
-                        }
-
-                        if ( isset($item['name']) ) {
-                            $item['name'] = 2;
-                        }
-                    }
-
                     $fieldList[$key] = $item;
                     
                     break;
@@ -135,7 +125,7 @@ class EntityResolver {
     {
         $list = [];
 
-        $search = $caseSensitive ?  $this->properties : array_change_key_case($this->properties, \CASE_LOWER);
+        $search = $caseSensitive ? $this->properties : array_change_key_case($this->properties, \CASE_LOWER);
 
         if ( null !== ( $search[$field] ?? null ) ) {
             foreach($search[$field]['tags'] ?? [] as $tag) {
diff --git a/src/Common/Sql.php b/src/Common/Sql.php
index 1d5c01c..cd02dc3 100644
--- a/src/Common/Sql.php
+++ b/src/Common/Sql.php
@@ -2,11 +2,13 @@
 
 namespace Ulmus\Common;
 
+use Ulmus\Query\WhereRawParameter;
+
 abstract class Sql {
 
     public static function function($name, ...$arguments)
     {
-        return new class($name, ...$arguments) {
+        return new class($name, ...$arguments) implements WhereRawParameter {
 
             protected string $as = "";
 
@@ -20,19 +22,23 @@ abstract class Sql {
                 $this->parseArguments();
             }
 
-            public function __toString() {
+            public function __toString() : string
+            {
                 return implode(' ', array_filter([
                     "{$this->name}(" . implode(", ", $this->arguments) . ")",
                     $this->as ? "AS {$this->as}" : false,
                 ]));
             }
 
-            public function as($fieldName) {
+            public function as($fieldName) : self
+            {
                 $this->as = $fieldName;
+
                 return $this;
             }
 
-            protected function parseArguments() {
+            protected function parseArguments() : void
+            {
                 foreach($this->arguments as &$item) {
                     $item = Sql::escape($item);
                 }
@@ -42,7 +48,7 @@ abstract class Sql {
     
     public static function identifier(string $identifier) : object
     {
-        return new class($identifier) {
+        return new class($identifier) implements WhereRawParameter {
             
             protected string $identifier;
             
diff --git a/src/EntityCollection.php b/src/EntityCollection.php
index 8e84639..0ef38e8 100644
--- a/src/EntityCollection.php
+++ b/src/EntityCollection.php
@@ -87,6 +87,13 @@ class EntityCollection extends \ArrayObject {
         return $removed;
     }
 
+    public function clear() : self
+    {
+        $this->exchangeArray([]);
+
+        return $this;
+    }
+
     public function search($value, string $field, bool $strict = true) : Generator
     {
         foreach($this->filters(fn($v) => isset($v->$field) ? ( $strict ? $v->$field === $value : $v->$field == $value ) : false) as $key => $item) {
@@ -134,6 +141,11 @@ class EntityCollection extends \ArrayObject {
         return $obj;
     }
 
+    public function searchInstances(string $className) : self
+    {
+        return $this->filtersCollection(fn($obj) => is_a($obj, $className));
+    }
+
     public function column($field, bool $unique = false) : array
     {
         $list = [];
@@ -146,8 +158,8 @@ class EntityCollection extends \ArrayObject {
                 $value = $item->$field;
             }
 
-            if ($unique && in_array($value, $list)) {
-                break;
+            if ($unique && in_array($value, $list, true)) {
+                continue;
             }
 
             $list[] = $value;
@@ -279,6 +291,13 @@ class EntityCollection extends \ArrayObject {
         }
     }
 
+    public function push($value) : self
+    {
+        $this->append($value);
+
+        return $this;
+    }
+
     public function mergeWith( /*array|EntityCollection*/ $datasets ) : self
     {
         if ( is_object($datasets) ) {
@@ -331,6 +350,11 @@ class EntityCollection extends \ArrayObject {
         return $this;
     }
 
+    public function rsort(callable $callback, $function = "uasort") : self
+    {
+        return $this->sort(...func_get_args())->reverse();
+    }
+
     public function pop() /* : mixed */
     {
         $arr = $this->getArrayCopy();
diff --git a/src/EntityTrait.php b/src/EntityTrait.php
index 23f93fe..4487ed1 100644
--- a/src/EntityTrait.php
+++ b/src/EntityTrait.php
@@ -14,52 +14,23 @@ use Ulmus\Annotation\Property\Relation\{ Ignore as RelationIgnore };
 
 trait EntityTrait {
     use EventTrait;
-    
+
     /**
      * @Ignore
      */
     protected bool $entityStrictFieldsDeclaration = false;
-    
+
     /**
      * @Ignore
      */
     protected array $entityDatasetUnmatchedFields = [];
-    
+
     /**
      * @Ignore
      */
     public array $entityLoadedDataset = [];
 
-    /**
-     * @Ignore
-     */
-    public function __get(string $name)
-    {
-        $relation = new Repository\RelationBuilder($this);
-        
-        if ( false !== $data = $relation->searchRelation($name) ) {
-            return $this->$name = $data;
-        }
-        
-        throw new \Exception(sprintf("[%s] - Undefined variable: %s", static::class, $name));
-    }
-    
-    /**
-     * @Ignore
-     */
-    public function __isset(string $name) : bool
-    {
-        #if ( null !== $relation = static::resolveEntity()->searchFieldAnnotation($name, new Relation() ) ) {
-        #    return isset($this->{$relation->key});
-        #}
-        if ( $this->isLoaded() && static::resolveEntity()->searchFieldAnnotation($name, new Relation() ) ) {
-           return true;
-        }
-
-        return isset($this->$name);
-    }
-    
-    /**
+    /**entityLoadedDataset
      * @Ignore
      */
     public function entityFillFromDataset(iterable $dataset, bool $overwriteDataset = false) : self
@@ -71,9 +42,7 @@ trait EntityTrait {
         foreach($dataset as $key => $value) {
             $field = $entityResolver->field(strtolower($key), EntityResolver::KEY_COLUMN_NAME, false) ?? null;
 
-            if ( $field === null ) {
-                $field = $entityResolver->field(strtolower($key), EntityResolver::KEY_LC_ENTITY_NAME, false);
-            }
+            $field ??= $entityResolver->field(strtolower($key), EntityResolver::KEY_LC_ENTITY_NAME, false);
 
             if ( $field === null ) {
                 if ($this->entityStrictFieldsDeclaration ) {
@@ -104,17 +73,22 @@ trait EntityTrait {
                     }
                 }
                 elseif ( $field['type'] === 'bool' ) {
-                    $this->{$field['name']} = (bool) $value;
+                    $value = (bool) $value;
                 }
 
                 $this->{$field['name']} = $value;
             }
             elseif ( ! $field['builtin'] ) {
-                $this->{$field['name']} = Ulmus::instanciateObject($field['type'], [ $value ]);
+                try {
+                    $this->{$field['name']} = Ulmus::instanciateObject($field['type'], [ $value ]);
+                }
+                catch(\Error $e) {
+                    throw new \Error(sprintf("%s for class '%s' on field '%s'", $e->getMessage(), get_class($this), $field['name']));
+                }
             }
 
             # Keeping original data to diff on UPDATE query
-            if ( ! $loaded ) {
+            if ( ! $loaded /* || $isLoadedDataset */ ) {
                 #if ( $field !== null ) {
                 #    $annotation = $entityResolver->searchFieldAnnotation($field['name'], new Field() );
                 #    $this->entityLoadedDataset[$annotation ? $annotation->name : $field['name']] = $dataset;       # <--------- THIS TO FIX !!!!!!
@@ -143,7 +117,7 @@ trait EntityTrait {
 
         return $this;
     }
-    
+
     /**
      * @Ignore
      */
@@ -151,7 +125,7 @@ trait EntityTrait {
     {
         return $this->entityFillFromDataset($dataset);
     }
-    
+
     /**
      * @Ignore
      */
@@ -160,53 +134,53 @@ trait EntityTrait {
         if ( $returnSource ) {
             return $this->entityLoadedDataset;
         }
-        
+
         $dataset = [];
-        
+
         $entityResolver = $this->resolveEntity();
-        
+
         foreach($entityResolver->fieldList(Common\EntityResolver::KEY_ENTITY_NAME, true) as $key => $field) {
             $annotation = $entityResolver->searchFieldAnnotation($key, new Field() );
 
-            if ( isset($this->$key) ) { 
+            if ( isset($this->$key) ) {
                 $realKey = $annotation->name ?? $key;
-                
+
                 switch (true) {
                     case is_object($this->$key):
                         $dataset[$realKey] = Ulmus::convertObject($this->$key);
-                    break;
-                        
-                    case is_array($this->$key):    
+                        break;
+
+                    case is_array($this->$key):
                         $dataset[$realKey] = Ulmus::encodeArray($this->$key);
-                    break;
+                        break;
 
                     case is_bool($this->$key):
                         $dataset[$realKey] = (int) $this->$key;
-                    break;
-                    
+                        break;
+
                     default:
-                       $dataset[$realKey] = $this->$key;
+                        $dataset[$realKey] = $this->$key;
                 }
             }
             elseif ( $field['nullable'] ) {
                 $dataset[ $annotation->name ?? $key ] = null;
             }
         }
-        
+
         # @TODO Must fix recursive bug !
         if ($includeRelations) {
             foreach($entityResolver->properties as $name => $field){
                 $relation = $entityResolver->searchFieldAnnotation($name, new Relation() );
-                
+
                 if ( $relation && isset($this->$name) && ($relation->entity ?? $relation->bridge) !== static::class ) {
                     if ( null !== $value = $this->$name ?? null ) {
                         if ( is_iterable($value) ) {
                             $list = [];
-                            
+
                             foreach($value as $entity) {
                                 $list[] = $entity->entityGetDataset(false);
                             }
-                            
+
                             $dataset[$name] = $list;
                         }
                         elseif ( is_object($value) ) {
@@ -215,11 +189,11 @@ trait EntityTrait {
                     }
                 }
             }
-        }  
-        
+        }
+
         return $dataset;
     }
-    
+
     /**
      * @Ignore
      */
@@ -227,7 +201,7 @@ trait EntityTrait {
     {
         return $this->entityGetDataset($includeRelations);
     }
-    
+
     /**
      * @Ignore
      */
@@ -235,7 +209,7 @@ trait EntityTrait {
     {
         return static::entityCollection([ $this ]);
     }
-    
+
     /**
      * @Ignore
      */
@@ -244,16 +218,45 @@ trait EntityTrait {
         if ( null === $pkField = $this->resolveEntity()->getPrimaryKeyField($this) ) {
             throw new Exception\EntityPrimaryKeyUnknown(sprintf("Entity %s has no field containing attributes 'primary_key'", static::class));
         }
-        
+
         $key = key($pkField);
-        
+
         return isset($this->$key);
     }
 
     /**
      * @Ignore
      */
-    public function __sleep() 
+    public function __get(string $name)
+    {
+        $relation = new Repository\RelationBuilder($this);
+
+        if ( false !== $data = $relation->searchRelation($name) ) {
+            return $this->$name = $data;
+        }
+
+        throw new \Exception(sprintf("[%s] - Undefined variable: %s", static::class, $name));
+    }
+
+    /**
+     * @Ignore
+     */
+    public function __isset(string $name) : bool
+    {
+        #if ( null !== $relation = static::resolveEntity()->searchFieldAnnotation($name, new Relation() ) ) {
+        #    return isset($this->{$relation->key});
+        #}
+        if ( $this->isLoaded() && static::resolveEntity()->searchFieldAnnotation($name, new Relation() ) ) {
+            return true;
+        }
+
+        return isset($this->$name);
+    }
+
+    /**
+     * @Ignore
+     */
+    public function __sleep()
     {
         return array_keys($this->resolveEntity()->fieldList());
     }
@@ -279,9 +282,9 @@ trait EntityTrait {
      */
     public function jsonSerialize()
     {
-        return $this->entityGetDataset(); 
+        return $this->entityGetDataset();
     }
-    
+
     /**
      * @Ignore
      */
@@ -309,6 +312,15 @@ trait EntityTrait {
         return $collection;
     }
 
+
+    /**
+     * @Ignore
+     */
+    public static function queryBuilder() : QueryBuilder
+    {
+        return Ulmus::queryBuilder(static::class);
+    }
+
     /**
      * @Ignore
      */
diff --git a/src/Query/Where.php b/src/Query/Where.php
index f9e81db..a895409 100644
--- a/src/Query/Where.php
+++ b/src/Query/Where.php
@@ -2,8 +2,7 @@
 
 namespace Ulmus\Query;
 
-use Ulmus\Common\EntityField,
-    Ulmus\Common\Sql;
+use Ulmus\Common\Sql;
 
 class Where extends Fragment {
     const OPERATOR_LIKE = "LIKE";
@@ -136,10 +135,11 @@ class Where extends Fragment {
             {
                 if ( $value === null ) {
                     $this->operator = in_array($this->operator, [ '!=', '<>' ]) ? Where::COMPARISON_IS . " " . Where::CONDITION_NOT : Where::COMPARISON_IS;
+
                     return Where::COMPARISON_NULL;
                 }
-                elseif ( is_object($value) && ( $value instanceof EntityField ) ) {
-                    return $value->name();
+                elseif (is_object($value) && ( $value instanceof WhereRawParameter ) ) {
+                    return (string) $value;
                 }
                 else {
                     return $this->queryBuilder->addParameter($value);
diff --git a/src/Query/WhereRawParameter.php b/src/Query/WhereRawParameter.php
new file mode 100644
index 0000000..ed876ba
--- /dev/null
+++ b/src/Query/WhereRawParameter.php
@@ -0,0 +1,7 @@
+<?php
+
+
+namespace Ulmus\Query;
+
+
+interface WhereRawParameter {}
\ No newline at end of file
diff --git a/src/Repository.php b/src/Repository.php
index 1f6a655..267efe8 100644
--- a/src/Repository.php
+++ b/src/Repository.php
@@ -2,7 +2,7 @@
 
 namespace Ulmus;
 
-use Ulmus\Annotation\Property\{ Field, Filter, FilterJoin, Where, Having, Relation, Join, WithJoin, Relation\Ignore as RelationIgnore };
+use Ulmus\Annotation\Property\{Field, Where, Having, Relation, Filter, Join, FilterJoin, WithJoin, Relation\Ignore as RelationIgnore};
 use Ulmus\Common\EntityResolver;
 
 class Repository
@@ -148,7 +148,7 @@ class Repository
             # $dataset = array_filter($dataset, fn($item, $field) => ! ($this->entityResolver->searchFieldAnnotation($field, new Field, false)->readonly ?? false), \ARRAY_FILTER_USE_BOTH);
 
             $statement = $this->insertSqlQuery($fieldsAndValue ?? $dataset, $replace)->runInsertQuery();
-
+            
             if ( ( 0 !== $statement->lastInsertId ) && 
                ( null !== $primaryKeyDefinition )) {
 
@@ -183,23 +183,82 @@ class Repository
         return false;
     }
 
+    public function saveAll(EntityCollection $collection) : int
+    {
+        $changed = 0;
+
+        foreach ($collection as $entity) {
+            $this->save($entity) && $changed++;
+        }
+
+        return $changed;
+
+    }
+
+    public function loadCollectionRelation(EntityCollection $collection, /*array|string*/ $fields) : void
+    {
+        foreach ((array)$fields as $name) {
+            if (null !== ($relation = $this->entityResolver->searchFieldAnnotation($name, new Annotation\Property\Relation()))) {
+                $relationType = strtolower(str_replace(['-', '_', ' '], '', $relation->type));
+
+                $order = $this->entityResolver->searchFieldAnnotationList($name, new Annotation\Property\OrderBy());
+                $where = $this->entityResolver->searchFieldAnnotationList($name, new Annotation\Property\Where());
+
+                $baseEntity = $relation->entity ?? $relation->bridge ?? $this->entityResolver->properties[$name]['type'];
+                $baseEntityResolver = $baseEntity::resolveEntity();
+
+                $property = ($baseEntityResolver->field($relation->foreignKey, 01, false) ?: $baseEntityResolver->field($relation->foreignKey, 02))['name'];
+                $entityProperty = ($this->entityResolver->field($relation->key, 01, false) ?: $this->entityResolver->field($relation->key, 02))['name'];
+
+                $repository = $baseEntity::repository();
+
+                foreach ($where as $condition) {
+                    $repository->where($condition->field, is_callable($condition->value) ? call_user_func_array($condition->value, [$this]) : $condition->value, $condition->operator, $condition->condition);
+                }
+
+                foreach ($order as $item) {
+                    $repository->orderBy($item->field, $item->order);
+                }
+
+                $field = $relation->key;
+
+                $values = [];
+
+                $key = is_object($relation->foreignKey) ? $relation->foreignKey : $baseEntity::field($relation->foreignKey);
+
+                foreach ($collection as $item) {
+                    $values[] = is_callable($field) ? $field($item) : $item->$entityProperty;
+                }
+
+                $repository->where($key, $values);
+
+                switch ($relationType) {
+                    case 'onetoone':
+                        $results = call_user_func([$repository, "loadOne"]);
+                        $item->$name = $results ?: new $baseEntity();
+
+                        break;
+
+                    case 'onetomany':
+                        $results = call_user_func([$repository, $relation->function]);
+
+                        foreach ($collection as $item) {
+                            $item->$name = $baseEntity::entityCollection();
+                            $item->$name->mergeWith($results->filtersCollection(fn($e) => $e->$property === $item->$entityProperty));
+                        }
+
+                        break;
+                }
+            }
+        }
+    }
+
     public function replace(/*object|array*/ $entity, ? array $fieldsAndValue = null) : bool
     {
         return $this->save($entity, $fieldsAndValue, true);
     }
 
-    public function saveAll(EntityCollection $collection) : int
-    {
-        $changed = 0;
-
-        foreach($collection as $entity) {
-            $this->save($entity) && $changed++;
-        }
-
-        return $changed;
-    }
-
-    public function replaceAll(EntityCollection $collection) : void
+    public function replaceAll(/*EntityCollection|array*/ $collection) : void
     {
         foreach($collection as $entity) {
             $this->replace($entity);
@@ -262,6 +321,13 @@ class Repository
         }
     }
 
+    public function removeQueryFragment(/*? Query\Fragment|string*/ $fragment) : self
+    {
+        $fragment && $this->queryBuilder->removeFragment($fragment);
+
+        return $this;
+    }
+
     public function selectEntity(string $entity, string $alias, string $prependField = "") : self
     {
         $prependField and ($prependField .= "$");
@@ -479,6 +545,7 @@ class Repository
             $this->select("{$this->alias}.*");
         }
 
+        # @TODO Apply FILTER annotation to this too !
         foreach(array_filter((array) $fields) as $item) {
             $annotation = $this->entityResolver->searchFieldAnnotation($item, new Join) ?:
                 $this->entityResolver->searchFieldAnnotation($item, new Relation);
@@ -611,6 +678,30 @@ class Repository
         return $this;
     }
 
+    public function filterServerRequest(SearchRequest\SearchRequestInterface $searchRequest, bool $count = true) : self
+    {
+        if ($count) {
+            $searchRequest->count = $searchRequest->filter($this->serverRequestCountRepository())
+                ->wheres($searchRequest->wheres(), Query\Where::OPERATOR_EQUAL, Query\Where::CONDITION_AND)
+                ->likes($searchRequest->likes(), Query\Where::CONDITION_OR)
+                ->groups($searchRequest->groups())
+                ->count();
+        }
+
+        return $searchRequest->filter($this)
+            ->wheres($searchRequest->wheres(), Query\Where::OPERATOR_EQUAL, Query\Where::CONDITION_AND)
+            ->likes($searchRequest->likes(), Query\Where::CONDITION_OR)
+            ->orders($searchRequest->orders())
+            ->groups($searchRequest->groups())
+            ->offset($searchRequest->offset())
+            ->limit($searchRequest->limit());
+    }
+
+    protected function serverRequestCountRepository() : Repository
+    {
+        return new Repository\ServerRequestCountRepository($this->entityClass, $this->alias, $this->adapter);
+    }
+
     public function collectionFromQuery(? string $entityClass = null) : EntityCollection
     {
         $class = $entityClass ?: $this->entityClass;
@@ -831,29 +922,4 @@ class Repository
     }
 
     protected function finalizeQuery() : void {}
-
-    public function filterServerRequest(SearchRequest\SearchRequestInterface $searchRequest, bool $count = true) : self
-    {
-        if ($count) {
-            # @TODO Must be placed inside an event instead of directly there !
-            $searchRequest->count = $searchRequest->filter($this->serverRequestCountRepository())
-                ->wheres($searchRequest->wheres(), Query\Where::OPERATOR_EQUAL, Query\Where::CONDITION_AND)
-                ->likes($searchRequest->likes(), Query\Where::CONDITION_OR)
-                ->groups($searchRequest->groups())
-                ->count();
-        }
-
-        return $searchRequest->filter($this)
-            ->wheres($searchRequest->wheres(), Query\Where::OPERATOR_EQUAL, Query\Where::CONDITION_AND)
-            ->likes($searchRequest->likes(), Query\Where::CONDITION_OR)
-            ->orders($searchRequest->orders())
-            ->groups($searchRequest->groups())
-            ->offset($searchRequest->offset())
-            ->limit($searchRequest->limit());
-    }
-
-    protected function serverRequestCountRepository() : Repository
-    {
-        return new Repository\ServerRequestCountRepository($this->entityClass, $this->alias, $this->adapter);
-    }
 }
\ No newline at end of file
diff --git a/src/Repository/RelationBuilder.php b/src/Repository/RelationBuilder.php
index 2d5470c..8024250 100644
--- a/src/Repository/RelationBuilder.php
+++ b/src/Repository/RelationBuilder.php
@@ -118,7 +118,7 @@ class RelationBuilder
             $this->repository->open();
 
             foreach($this->wheres as $condition) {
-                $this->repository->where($condition->field, $condition->value, $condition->operator);
+                $this->repository->where($condition->field, is_callable($condition->value) ? call_user_func_array($condition->value, [ $this->entity ]) : $condition->value, $condition->operator);
             }
 
             $this->repository->close();
@@ -155,7 +155,10 @@ class RelationBuilder
                 $entity = $annotation->entity ?? $this->resolver->properties[$name]['type'];
             }
 
+            $name = strtolower($name);
+
             foreach($data ?: $this->entity->entityLoadedDataset as $key => $value) {
+
                 if ( $key === sprintf(static::SUBQUERY_FIELD_SUFFIX, strtolower($name)) ) {
                     if ($value) {
                         if ( null === ( $dataset = \json_decode($value, true) ) ) {
@@ -227,6 +230,11 @@ class RelationBuilder
 
             })->where( $this->entity::field($bridgeRelation->foreignKey, $relationAlias), is_string($this->entity) ? $this->entity::field($bridgeRelation->foreignKey) : $this->entity->{$bridgeRelation->foreignKey} );
 
+
+        $this->applyWhere();
+
+        $this->applyOrderBy();
+
         if ($selectBridgeField && $relation->bridgeField) {
             $this->repository->selectEntity($relation->bridge, $bridgeAlias, $bridgeAlias);
         }