Schema Map not properly validating/casting value type

[franktzheng]

What is the current behavior?

If I create a schema containing a Map of another schema, the type casting and validation does not seem to be working correctly.

If the current behavior is a bug, please provide the steps to reproduce.

const userSchema = new mongoose.Schema({
  modules: {
    type: Map,
    of: {
      isRequired: {
        type: String,
        required: true
      },
      hasDefault: {
        type: String,
        default: "test"
      }
    }
  }
})

const User = model('User', userSchema)

// Successfully creates user
User.create({ modules: { example: { /* missing isRequired and hasDefault property */ } } })

What is the expected behavior?

Throw an error as a result of missing isRequired and fill in hasDefault to be "test".

What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.

Node: 12.3.1
Mongoose: 5.5.12
MongoDB: Atlas

[franktzheng]

The solution is to nest schemas:

const userSchema = new mongoose.Schema({
  modules: {
    type: Map,
    of: {
      new mongoose.Schema({
        isRequired: {
          type: String,
          required: true
        },
        hasDefault: {
          type: String,
          default: "test"
        }
      })
    }
  }
})

[Fonger]

@vkarpov15 In Mongoose Map schema, of should be one of the valid value of type.

Like in normal schema, type: { xxx: x } is actually interpreted as Mixed type so it makes sense that of: { xxx: x } is interpreted as Mixed type too.

If we really want to support this, I think #7181 will cover this issue and need to be discussed.