/// <summary>
/// Register a property as a DbRef - implement a custom Serialize/Deserialize actions to convert entity to $id, $ref only
/// </summary>
private static void RegisterDbRefItem(BsonMapper mapper, MemberMapper member, ITypeNameBinder typeNameBinder, string collection)
{
// get entity
var entity = mapper.GetEntityMapper(member.DataType);
member.Serialize = (obj, m) =>
{
// supports null values when "SerializeNullValues = true"
if (obj == null)
{
return(BsonValue.Null);
}
var idField = entity.Id;
// #768 if using DbRef with interface with no ID mapped
if (idField == null)
{
throw new LiteException(0, "There is no _id field mapped in your type: " + member.DataType.FullName);
}
var id = idField.Getter(obj);
var bsonDocument = new BsonDocument
{
["$id"] = m.Serialize(id.GetType(), id, 0),
["$ref"] = collection
};
if (member.DataType != obj.GetType())
{
bsonDocument["$type"] = typeNameBinder.GetName(obj.GetType());
}
return(bsonDocument);
};
member.Deserialize = (bson, m) =>
{
var idRef = bson.IsDocument ? bson["$id"] : BsonValue.Null;
var missing = bson.IsDocument ? (bson["$missing"] == true) : false;
if (missing)
{
return(null);
}
return(m.Deserialize(entity.ForType,
idRef.IsNull ?
bson : // if has no $id object was full loaded (via Include) - so deserialize using normal function
bson.AsDocument.ContainsKey("$type") ?
new BsonDocument {
["_id"] = idRef, ["_type"] = bson["$type"]
} :
new BsonDocument {
["_id"] = idRef
})); // if has $id, deserialize object using only _id object
};
}
/// <summary>
/// Register a property as a DbRefList - implement a custom Serialize/Deserialize actions to convert entity to $id, $ref only
/// </summary>
private static void RegisterDbRefList(BsonMapper mapper, MemberMapper member, ITypeNameBinder typeNameBinder, string collection)
{
// get entity from list item type
var entity = mapper.GetEntityMapper(member.UnderlyingType);
member.Serialize = (list, m) =>
{
// supports null values when "SerializeNullValues = true"
if (list == null)
{
return(BsonValue.Null);
}
var result = new BsonArray();
var idField = entity.Id;
foreach (var item in (IEnumerable)list)
{
if (item == null)
{
continue;
}
var id = idField.Getter(item);
var bsonDocument = new BsonDocument
{
["$id"] = m.Serialize(id.GetType(), id, 0),
["$ref"] = collection
};
if (member.UnderlyingType != item.GetType())
{
bsonDocument["$type"] = typeNameBinder.GetName(item.GetType());
}
result.Add(bsonDocument);
}
return(result);
};
member.Deserialize = (bson, m) =>
{
if (bson.IsArray == false)
{
return(null);
}
var array = bson.AsArray;
if (array.Count == 0)
{
return(m.Deserialize(member.DataType, array));
}
// copy array changing $id to _id
var result = new BsonArray();
foreach (var item in array)
{
if (item.IsDocument == false)
{
continue;
}
var doc = item.AsDocument;
var idRef = doc["$id"];
var missing = doc["$missing"] == true;
var included = doc.ContainsKey("$ref") == false;
// if referece document are missing, do not inlcude on output list
if (missing)
{
continue;
}
// if refId is null was included by "include" query, so "item" is full filled document
if (included)
{
item["_id"] = idRef;
if (item.AsDocument.ContainsKey("$type"))
{
item["_type"] = item["$type"];
}
result.Add(item);
}
else
{
var bsonDocument = new BsonDocument {
["_id"] = idRef
};
if (item.AsDocument.ContainsKey("$type"))
{
bsonDocument["_type"] = item["$type"];
}
result.Add(bsonDocument);
}
}
return(m.Deserialize(member.DataType, result));
};
}
/// <summary>
/// Register a property as a DbRef - implement a custom Serialize/Deserialize actions to convert entity to $id, $ref only
/// </summary>
private static void RegisterDbRefItem(BsonMapper mapper, MemberMapper member, ITypeNameBinder typeNameBinder, string collection)
{
// get entity
var entity = mapper.GetEntityMapper(member.DataType);
member.Serialize = (obj, m) =>
{
// supports null values when "SerializeNullValues = true"
if (obj == null)
{
return(BsonValue.Null);
}
var idField = entity.Id;
// #768 if using DbRef with interface with no ID mapped
if (idField == null)
{
throw new LiteException(0, "There is no _id field mapped in your type: " + member.DataType.FullName);
}
var id = idField.Getter(obj);
var bsonDocument = new BsonDocument
{
["$id"] = m.Serialize(id.GetType(), id, 0),
["$ref"] = collection
};
if (member.DataType != obj.GetType())
{
bsonDocument["$type"] = typeNameBinder.GetName(obj.GetType());
}
return(bsonDocument);
};
member.Deserialize = (bson, m) =>
{
// if not a document (maybe BsonValue.null) returns null
if (bson == null || bson.IsDocument == false)
{
return(null);
}
var doc = bson.AsDocument;
var idRef = doc["$id"];
var missing = doc["$missing"] == true;
var included = doc.ContainsKey("$ref") == false;
if (missing)
{
return(null);
}
if (included)
{
doc["_id"] = idRef;
if (doc.ContainsKey("$type"))
{
doc["_type"] = bson["$type"];
}
return(m.Deserialize(entity.ForType, doc));
}
else
{
return(m.Deserialize(entity.ForType,
doc.ContainsKey("$type") ?
new BsonDocument {
["_id"] = idRef, ["_type"] = bson["$type"]
} :
new BsonDocument {
["_id"] = idRef
})); // if has $id, deserialize object using only _id object
}
};
}