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Document list/map/set initialization on read.

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Update the reference documentation about collection initialization on read, add the required tests to make sure it behaves as expected and simplify BeanUtils value presence check.

Closes #4571
Original pull request: #4574
This commit is contained in:
Christoph Strobl
2023-11-30 10:16:04 +01:00
committed by Mark Paluch
parent fa9fbcb2ed
commit e5b9f7d455
3 changed files with 90 additions and 1 deletions
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11
src/main/antora/modules/ROOT/pages/mongodb/mapping/mapping.adoc
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@@ -274,6 +274,17 @@ calling `get()` before the actual conversion
|===
====
.Collection Handling
[NOTE]
====
Collection handing depends on the actual values retrieved from the MongoDB.
* If a document does **not** contain the field mapped to a collection, the mapping will not touch the property.
Which means the value will remain `null`, a java default or any value set during object creation.
* If the document contains the field to be mapped, but the field holds a `null` value (like: `{ 'list' : null }`), the property value is set to `null` overriding any default value set during object creation.
* If the document contains the field to be mapped to a collection which is **not** `null` (like: `{ 'list' : [ ... ] }`), the collection is populated with the mapped values overriding any default value set during object creation.
====
[[mapping-configuration]]
== Mapping Configuration