Cannot persist a list of custom property types in Mongo about grails-data-mapping

[rainerfrey]

Presumably, the evaluation of a List as a Simple or Basic type supersedes the custom marshallers.

I'm having the same problem with a map. Your presumption seems to be right (as far as I understand the code while debugging). My workaround: my map doesn't actually implement java.util.Map (Collection in your case), but delegates to a map internally, and provides a necessary subset of Map's interface.

[keeth]

I ran into a similar issue. marking the field as embedded fixed it.

class RegularPerson {
    static embedded = ['birthday'] 

    String name
    Birthday birthday
}

[nikomakela]

Did it also fix the list type, because I'm still having this in mongo-plugin version 3.0.3?

I've now tried with

class FormSubField extends HashMap<String, FormFieldList> implements Serializable {
}

and

class FormFieldList extends ArrayList<FormField> implements Serializable {
}

and with marshaller for custom list type

class FormFieldListType extends AbstractMappingAwareCustomTypeMarshaller<FormFieldList, DBObject, DBObject> {
    FormFieldListType() {
        super(FormFieldList)
        println "super(FormFieldList)"
    }

//...
}

Constructor is called, so it is registered properly, but writeInternal nor readInternal are never called!

[nikomakela]

It seems like that embedded properties cannot have a custom type marshaller. WriteInternal is never called for embedded properties, but them are for basic types. I also made a test domain and tried to persist different kind of proeprties. It seems like only basic types are persisted in database.

class SubFieldTest {

    static mapWith = "mongo"
    static embedded = ['subFieldsMapEmbedded','subFieldMap', 'stringMap','mapsMapEmbedded','objectsMapEmbedded','mapsMapEmbeddedWithSetter']

    Map<String, List<AbstractFormField>> subFieldsMapEmbedded
    Map<String, List<Object>> objectsMapEmbedded
    Map<String, List<Map>> mapsMapEmbedded
    Map<String, List<AbstractFormField>> subFieldsMapNotEmbedded
    Map<String, List<String>> stringMapEmbedded // Works
    Map<String, AbstractFormField> subFieldMapEmbedded
    Map<String, List<Map>> mapsMapEmbeddedWithSetter // Writing works, not reading from db

    void setMapsMapEmbeddedWithSetter(Map<String, List<AbstractFormField>> valueMap){

        def subFieldsValue = [:]

        valueMap.each{ trigger, subFieldList ->

            subFieldsValue[trigger] = subFieldList.collect{ instance ->
                def map = [:]
                println "instance.domainClass.persistentProperties: ${instance.domainClass.persistentProperties}"
                instance.domainClass.persistentProperties.each{ persistentProperty ->

                    def value = instance.properties[persistentProperty.name]
                    if(value != null){

                        map[persistentProperty.name] = value
                    }
                }
                return map
            }
        }

        this.mapsMapEmbeddedWithSetter = subFieldsValue
    }
}

Some related links:

• http://stackoverflow.com/questions/11921985/how-to-support-embedded-maps-with-custom-value-types-in-mongodb-gorm
• https://github.com/grails/grails-data-mapping/blob/3.x/grails-datastore-core/src/main/groovy/org/grails/datastore/mapping/model/MappingFactory.java#L131
• http://stackoverflow.com/questions/14712428/grailsmongodb-cant-serialize-mapstring-enum
• http://springsource.github.io/grails-data-mapping/mongo/manual/guide/3.%20Mapping%20Domain%20Classes%20to%20Mongo%20Collections.html#3.6%20Custom%20User%20Types

[nikomakela]

@divideby0 Have you found a solution to persist list of custom types? I would like to persist a map that contains a list of custom types as a value.

@graemerocher I don't think this is really fixed, because it seems like custom types are checked after simple types.

[graemerocher]

@nikomakela create a new issue and upload an example to github that reproduces the issue