I was somewhat surprised at the format of the REST API response, when
executing a query along the lines of:
SELECT FROM Person WHERE first_name = 'Rasmus'
What I get, is the following:
array(1) {
'result' =>
array(1) {
[0] =>
array(7) {
'@type' =>
string(1) "d"
'@rid' =>
string(5) "#10:0"
'@version' =>
int(2)
'@class' =>
string(6) "Person"
'last_name' =>
string(7) "Schultz"
'first_name' =>
string(6) "Rasmus"
'friend' =>
array(6) {
'@type' =>
string(1) "d"
'@rid' =>
string(5) "#10:1"
'@version' =>
int(1)
'@class' =>
string(6) "Person"
'last_name' =>
string(10) "Thinggaard"
'first_name' =>
string(2) "Bo"
}
}
}
}
Although this record is linked (not embedded), it appears embedded in the
result.
What I was expecting, was something more along the lines of this:
array(1) {
'result' =>
array(1) {
[0] =>
array(7) {
'@type' =>
string(1) "d"
'@rid' =>
string(5) "#10:0"
'@version' =>
int(2)
'@class' =>
string(6) "Person"
'last_name' =>
string(7) "Schultz"
'first_name' =>
string(6) "Rasmus"
'friend' =>
string(5) "#10:1"
}
[1] =>
array(6) {
'@type' =>
string(1) "d"
'@rid' =>
string(5) "#10:1"
'@version' =>
int(1)
'@class' =>
string(6) "Person"
'last_name' =>
string(10) "Thinggaard"
'first_name' =>
string(2) "Bo"
}
}
}
The fact that a related record appears as embedded in a parent record,
rather than as a reference, is what surprises me.
Suppose multiple Person documents have the same friend reference - you
would get multiple copies of the same record in the response then?
Isn't that a form of denormalization?
And what about circular references? If you use the default fetch strategy,
can you send the server into a circular tail spin?
I would expect embedded documents to appear as embedded in their parent
document, because they're value objects, not entities, right?
But links? These are references to other entities. Only the reference
itself (the key) is actually part of the parent aggregate - the entity
itself is not. Why should it appear inside the entity as though it were an
embedded value object?
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