@@ -38,7 +38,7 @@ class Database
3838 const PERMISSION_WRITE = 'write ' ;
3939
4040 // Collections
41- const COLLECTIONS = 'collections ' ;
41+ const METADATA = '_metadata ' ;
4242
4343 // Lengths
4444 const LENGTH_KEY = 255 ;
@@ -73,8 +73,8 @@ class Database
7373 * @var array
7474 */
7575 protected $ collection = [
76- '$id ' => self ::COLLECTIONS ,
77- '$collection ' => self ::COLLECTIONS ,
76+ '$id ' => self ::METADATA ,
77+ '$collection ' => self ::METADATA ,
7878 'name ' => 'collections ' ,
7979 'attributes ' => [
8080 [
@@ -243,7 +243,7 @@ public function create(): bool
243243 ['indexesInQueue ' , self ::VAR_STRING , 1000000 , false ],
244244 ]);
245245
246- $ this ->createCollection (self ::COLLECTIONS , $ attributes );
246+ $ this ->createCollection (self ::METADATA , $ attributes );
247247
248248 return true ;
249249 }
@@ -291,7 +291,7 @@ public function createCollection(string $id, array $attributes = [], array $inde
291291 {
292292 $ this ->adapter ->createCollection ($ id , $ attributes , $ indexes );
293293
294- if ($ id === self ::COLLECTIONS ) {
294+ if ($ id === self ::METADATA ) {
295295 return new Document ($ this ->collection );
296296 }
297297
@@ -326,7 +326,7 @@ public function createCollection(string $id, array $attributes = [], array $inde
326326 }
327327 }
328328
329- return $ this ->createDocument (Database:: COLLECTIONS , $ collection );
329+ return $ this ->createDocument (self :: METADATA , $ collection );
330330 }
331331
332332 /**
@@ -339,7 +339,7 @@ public function createCollection(string $id, array $attributes = [], array $inde
339339 */
340340 public function getCollection (string $ id ): Document
341341 {
342- return $ this ->getDocument (self ::COLLECTIONS , $ id );
342+ return $ this ->getDocument (self ::METADATA , $ id );
343343 }
344344
345345 /**
@@ -354,7 +354,7 @@ public function listCollections($limit = 25, $offset = 0): array
354354 {
355355 Authorization::disable ();
356356
357- $ result = $ this ->find (self ::COLLECTIONS , [], $ limit , $ offset );
357+ $ result = $ this ->find (self ::METADATA , [], $ limit , $ offset );
358358
359359 Authorization::reset ();
360360
@@ -372,7 +372,7 @@ public function deleteCollection(string $id): bool
372372 {
373373 $ this ->adapter ->deleteCollection ($ id );
374374
375- return $ this ->deleteDocument (self ::COLLECTIONS , $ id );
375+ return $ this ->deleteDocument (self ::METADATA , $ id );
376376 }
377377
378378 /**
@@ -434,8 +434,8 @@ public function createAttribute(string $collection, string $id, string $type, in
434434 throw new LimitException ('Row width limit reached. Cannot create new attribute. ' );
435435 }
436436
437- if ($ collection ->getId () !== self ::COLLECTIONS ) {
438- $ this ->updateDocument (self ::COLLECTIONS , $ collection ->getId (), $ collection );
437+ if ($ collection ->getId () !== self ::METADATA ) {
438+ $ this ->updateDocument (self ::METADATA , $ collection ->getId (), $ collection );
439439 }
440440
441441 switch ($ type ) {
@@ -513,8 +513,8 @@ public function deleteAttribute(string $collection, string $id): bool
513513
514514 $ collection ->setAttribute ('attributes ' , $ attributes );
515515
516- if ($ collection ->getId () !== self ::COLLECTIONS ) {
517- $ this ->updateDocument (self ::COLLECTIONS , $ collection ->getId (), $ collection );
516+ if ($ collection ->getId () !== self ::METADATA ) {
517+ $ this ->updateDocument (self ::METADATA , $ collection ->getId (), $ collection );
518518 }
519519
520520 return $ this ->adapter ->deleteAttribute ($ collection ->getId (), $ id );
@@ -588,8 +588,8 @@ public function addAttributeInQueue(string $collection, string $id, string $type
588588 throw new LimitException ('Row width limit reached. Cannot create new attribute. ' );
589589 }
590590
591- if ($ collection ->getId () !== self ::COLLECTIONS ) {
592- $ this ->updateDocument (self ::COLLECTIONS , $ collection ->getId (), $ collection );
591+ if ($ collection ->getId () !== self ::METADATA ) {
592+ $ this ->updateDocument (self ::METADATA , $ collection ->getId (), $ collection );
593593 }
594594
595595 return true ;
@@ -617,8 +617,8 @@ public function removeAttributeInQueue(string $collection, string $id): bool
617617
618618 $ collection ->setAttribute ('attributesInQueue ' , $ attributes );
619619
620- if ($ collection ->getId () !== self ::COLLECTIONS ) {
621- $ this ->updateDocument (self ::COLLECTIONS , $ collection ->getId (), $ collection );
620+ if ($ collection ->getId () !== self ::METADATA ) {
621+ $ this ->updateDocument (self ::METADATA , $ collection ->getId (), $ collection );
622622 }
623623
624624 return true ;
@@ -664,8 +664,8 @@ public function createIndex(string $collection, string $id, string $type, array
664664 'orders ' => $ orders ,
665665 ]), Document::SET_TYPE_APPEND );
666666
667- if ($ collection ->getId () !== self ::COLLECTIONS ) {
668- $ this ->updateDocument (self ::COLLECTIONS , $ collection ->getId (), $ collection );
667+ if ($ collection ->getId () !== self ::METADATA ) {
668+ $ this ->updateDocument (self ::METADATA , $ collection ->getId (), $ collection );
669669 }
670670
671671 switch ($ type ) {
@@ -717,8 +717,8 @@ public function deleteIndex(string $collection, string $id): bool
717717
718718 $ collection ->setAttribute ('indexes ' , $ indexes );
719719
720- if ($ collection ->getId () !== self ::COLLECTIONS ) {
721- $ this ->updateDocument (self ::COLLECTIONS , $ collection ->getId (), $ collection );
720+ if ($ collection ->getId () !== self ::METADATA ) {
721+ $ this ->updateDocument (self ::METADATA , $ collection ->getId (), $ collection );
722722 }
723723
724724 return $ this ->adapter ->deleteIndex ($ collection ->getId (), $ id );
@@ -772,8 +772,8 @@ public function addIndexInQueue(string $collection, string $id, string $type, ar
772772 throw new LimitException ('Index limit reached. Cannot create new index. ' );
773773 }
774774
775- if ($ collection ->getId () !== self ::COLLECTIONS ) {
776- $ this ->updateDocument (self ::COLLECTIONS , $ collection ->getId (), $ collection );
775+ if ($ collection ->getId () !== self ::METADATA ) {
776+ $ this ->updateDocument (self ::METADATA , $ collection ->getId (), $ collection );
777777 }
778778
779779 return true ;
@@ -801,8 +801,8 @@ public function removeIndexInQueue(string $collection, string $id): bool
801801
802802 $ collection ->setAttribute ('indexesInQueue ' , $ indexes );
803803
804- if ($ collection ->getId () !== self ::COLLECTIONS ) {
805- $ this ->updateDocument (self ::COLLECTIONS , $ collection ->getId (), $ collection );
804+ if ($ collection ->getId () !== self ::METADATA ) {
805+ $ this ->updateDocument (self ::METADATA , $ collection ->getId (), $ collection );
806806 }
807807
808808 return true ;
@@ -818,7 +818,7 @@ public function removeIndexInQueue(string $collection, string $id): bool
818818 */
819819 public function getDocument (string $ collection , string $ id ): Document
820820 {
821- if ($ collection === self ::COLLECTIONS && $ id === self ::COLLECTIONS ) {
821+ if ($ collection === self ::METADATA && $ id === self ::METADATA ) {
822822 return new Document ($ this ->collection );
823823 }
824824
@@ -835,7 +835,7 @@ public function getDocument(string $collection, string $id): Document
835835 $ document = new Document ($ cache );
836836 $ validator = new Authorization (self ::PERMISSION_READ );
837837
838- if (!$ validator ->isValid ($ document ->getRead ()) && $ collection ->getId () !== self ::COLLECTIONS ) { // Check if user has read access to this document
838+ if (!$ validator ->isValid ($ document ->getRead ()) && $ collection ->getId () !== self ::METADATA ) { // Check if user has read access to this document
839839 return new Document ();
840840 }
841841
@@ -852,7 +852,7 @@ public function getDocument(string $collection, string $id): Document
852852
853853 $ validator = new Authorization (self ::PERMISSION_READ );
854854
855- if (!$ validator ->isValid ($ document ->getRead ()) && $ collection ->getId () !== self ::COLLECTIONS ) { // Check if user has read access to this document
855+ if (!$ validator ->isValid ($ document ->getRead ()) && $ collection ->getId () !== self ::METADATA ) { // Check if user has read access to this document
856856 return new Document ();
857857 }
858858
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