Use jsonb to avoid problems on batch delete (#2267)

* Use jsonb to avoid problems on batch delete

* Add upgrade note

UPGRADE-4.0.md

@@ -12,6 +12,9 @@ Assuming your media table is called `media__media`, you could execute:
 UPDATE media__media SET cdnIsFlushable = false WHERE cdnIsFlushable IS NULL;
 ```
 
+We also added an option to use `jsonb` for the `providerMetadata` field. This will only affect you if you use PostgreSQL
+database. Please make sure you do the appropiate changes to your schema in order to be in sync.
+
 ### Removed unused JavaScript
 
 SonataMediaBundle 3 included a JavaScript dependency: Nivo Gallery. This dependency is not used on Sonata code,

src/Resources/config/doctrine/BaseMedia.orm.xml

@@ -7,7 +7,11 @@
         <field name="providerName" column="provider_name" type="string" length="255"/>
         <field name="providerStatus" column="provider_status" type="integer"/>
         <field name="providerReference" column="provider_reference" type="string" length="255"/>
-        <field name="providerMetadata" column="provider_metadata" type="json" nullable="true"/>
+        <field name="providerMetadata" column="provider_metadata" type="json" nullable="true">
+            <options>
+                <option name="jsonb">true</option>
+            </options>
+        </field>
         <field name="width" column="width" type="integer" nullable="true"/>
         <field name="height" column="height" type="integer" nullable="true"/>
         <field name="length" column="length" type="decimal" nullable="true"/>