ReactiveMongo: Manage Sequence field - mongodb

Question

I'm developing an app with Play Framework and ReactiveMongo.
I want to write CRUD operations for a model field with type of Seq[Entities]
Here is my model:
case class Person(_id: Option[BSONObjectID],
email: String,
password: String,
education: Option[Education])
object Lawyer {
implicit val accountWrites: Writes[Person] = (
(JsPath \ "_id").writeNullable[BSONObjectID] and
(JsPath \ "email").write[String] and
(JsPath \ "password").write[String] and
(JsPath \ "education").writeNullable[Education]
)(unlift(Person.unapply))
implicit val accountReads: Reads[Person] = (
(JsPath \ "_id").readNullable[BSONObjectID].map(_.getOrElse(BSONObjectID.generate)).map(Some(_)) and
(JsPath \ "email").read[String] and
(JsPath \ "password").read[String] and
(JsPath \ "education").readNullable[Education]
)(Person.apply _)
case class Education(status: String, certificates: Option[Seq[Certificate]])
object Education {
implicit val educationFormat: Format[Education] = (
(JsPath \ "status").format[String] and
(JsPath \ "certificates").formatNullable[Seq[Certificate]]
)(Education.apply, unlift(Education.unapply))
}
case class Certificate(id: Option[String] = Some(Random.alphanumeric.take(12).mkString),
name: String,
licenseCode: Option[String],
link: Option[String],
date: Date)
object Certificate {
implicit val certificateFormat = Json.format[Certificate]
}
The questions are:
1) How I can POST the Certificate entity using a form?
Because when I use:
def createCertificate(email: String, certificate: Certificate) = {
val createCertificate = Json.obj(
"$set" -> Json.obj(
"education.certificates" -> certificate
)
)
collection.update(
Json.obj("email" -> email),
createCertificate
)
}
It creates object field {...} insted of array of objects [ {...}, ... ]
2) How I can DELETE the Certificate entity from the Seq by ID?
Thanks

Answer 1

1) I assume that you want createCertificate to add a single certificate to an (possibly empty) array of certificates instead of creating an array with a single certificate. In that case you can replace your $set operator with the $push operator:
val createCertificate = Json.obj(
"$push" -> Json.obj(
"education.certificates" -> certificate
)
)
2) Likewise, for removing an element you can use the $pull operator:
def removeCertificate(email: String, certificateId: String) = {
val removeCert = Json.obj(
"$pull" -> Json.obj(
"education.certificates" -> Json.obj("id" -> certificateId)
)
)
collection.update(
Json.obj("email" -> email),
removeCert
)
}