Another modeling and architecture question

Question

Hello,
For some reason I still can't get my head around DocDB for more complicated relationships...
An extreme example in my app is a Practice Session. A session contains many attributes and could have multiple tasks, resources, songs, play-lists, and exercises. All of these items are modeled separately and can be added through their own forms.
Therefore lists of these items can be selected to add to a session but they also exist on their own.(to add to other types) I understand in a relational model how these multiple items can be added to a session. Relations through integer foreign keys
etc make sense there. In documents of JSON on the other hand I don't understand how to save these files and then correctly query them.
Lets say I have a practice session form that adds all these multiple items when submitted to a session 
document.
here is a model of a practice session:
public class PracticeSessions : Document
[Key]
[ScaffoldColumn(false)]
[JsonProperty(PropertyName = "id")]
public string objId { get; private set; } // session_ID (Primary key)
[JsonProperty(PropertyName = "name")]
[Required]
[Display(Name = "Name")]
public string Name { get; set; } // session_name
[MaxLength(500)]
[Display(Name = "Content")]
[AllowHtml]
[JsonProperty(PropertyName = "content")]
public string Content { get; set; } // session_content
[JsonProperty(PropertyName = "practiceResources")]
[Display(Name = "Resources")]
public List<PracticeResources> PracticeResources { get; set; }
[JsonProperty(PropertyName = "songLearnList")]
[Display(Name = "Song Learnlist")]
public SongPlaylists SongLearnList { get; set; }
[JsonProperty(PropertyName = "learnSongs")]
[Display(Name = "Learn Songs")]
public List<Songs> LearnSongs { get; set; }
[JsonProperty(PropertyName = "songPlayList")]
[Display(Name = "Song Playlist")]
public SongPlaylists SongPlayList { get; set; }
[JsonProperty(PropertyName = "playSongs")]
[Display(Name = "Play Songs")]
public List<Songs> PlaySongs { get; set; }
[JsonProperty(PropertyName = "studyTasks")]
[Display(Name = "Tasks")]
public List<StudyTasks> StudyTasks { get; set; }
[JsonProperty(PropertyName = "practiceGoals")]
[Display(Name = "Goals")]
public List<PracticeGoals> PracticeGoals { get; set; }
[JsonProperty(PropertyName = "exercise")]
[Display(Name = "Exercises")]
public List<IPM2014.DataAccess.Exercise> Exercise { get; set; }
[JsonProperty(PropertyName = "objectType")]
public string objectType { get { return "practiceSessions"; } }
[JsonProperty(PropertyName = "userId")]
public string UserId { get; set; } // UserID
public PracticeSessions()
PracticeResources = new List<PracticeResources>();
Exercise = new List<Exercise>();
PracticeGoals = new List<PracticeGoals>();
StudyTasks = new List<StudyTasks>();
PlaySongs = new List<Songs>();
LearnSongs = new List<Songs>();
Practice resource:
public class PracticeResources : Document
[Key]
[ScaffoldColumn(false)]
[JsonProperty(PropertyName = "id")]
public string objId { get; private set; } // resource_ID (Primary key)
[JsonProperty(PropertyName = "name")]
[Display(Name = "Name")]
public string Name { get; set; } // resource_name
[JsonProperty(PropertyName = "description")]
[MaxLength(200)]
[Display(Name = "Description")]
[AllowHtml]
public string Description { get; set; } // resource_description
[JsonProperty(PropertyName = "notes")]
[MaxLength(500)]
[Display(Name = "Notes")]
[AllowHtml]
public string Notes { get; set; } // resource_description
[JsonProperty(PropertyName = "type")]
[Display(Name = "Type")]
public string Type { get; set; } // resource_type
[JsonProperty(PropertyName = "link")]
// [DataType(DataType.Url)]
[Display(Name = "Link")]
public string Link { get; set; } // resource_link
[JsonProperty(PropertyName = "image")]
[Display(Name = "Image")]
public byte[] Image { get; set; }
[JsonProperty(PropertyName = "objectType")]
public string objectType { get { return "practiceResources"; } }
[ScaffoldColumn(false)]
[JsonProperty(PropertyName = "userId")]
public string UserId { get; set; } // UserId
If items are selected from say a checklist box (of practice resources) I could capture the "ID" of each resource into an array and send that to the controller. At that point though the type is a string not an object of the list type I am
adding. There is then a mismatch of types. How do I add the resource items to the session document? It won't work to just add the ID strings. Do I need to query back to the practice resource documents to get full objects to enter as a list? Even
if I do this and it may work I end up with the whole practice resource object inside the session document and if anything changes in the original it will be forever out of sync. Does it even make sense to try to do this in a doc database? I
really like the lack of a schema and other features of Doc DB but I don't want to try to go forward with something that isn't the right choice. Should I go back to using SQL Server and EF for 
this? Thats what I was using originally but was worried about schema changes and scale.
Sorry for this long winded question but I need to know if I should change my DB back end before going any further. Please let me know if you need more detail than this.
Thank You

Answer 1

hello and thanks for your reply, I probably will e-mail you so we can talk a little more about this. I think I am doing part of what you mention "A
common approach would be to store "type" and "id" as separate fields," I just call the type, objectType. I would like to use the composite Id's but I don't know what the best practice is to create them (not to mention other products,
but RavenDB takes care of that for you) This would also make the document names 100% more friendly when browsing them. What is the best way to manage these so they are unique? My biggest question though is still how to model and create these documents correctly.
I have added below example JSON that currently gets created.
[JsonProperty(PropertyName = "objectType")]
public string objectType { get { return "practiceResources"; } }
[JsonProperty(PropertyName = "objectType")]
public string objectType { get { return "practiceSessions"; } }
/* practice resource */
"id": "7d2f2eb4-7c02-4cd0-9ff9-af8d85b692be",
"name": "Guitar Pro 6",
"description": "Program to play and create tabs.",
"notes": null,
"type": "Software",
"link": "no url",
"image": null,
"objectType": "practiceResources",
"userId": "b1185d7f-0fcb-4c5c-96b9-d145409de3ed",
"_rid": "rOcQAL3OQQFMAAAAAAAAAA==",
"_self": "dbs/rOcQAA==/colls/rOcQAL3OQQE=/docs/rOcQAL3OQQFMAAAAAAAAAA==/",
"_ts": 1418690921,
"_etag": "\"00009e00-0000-0000-0000-548f81690000\"",
"_attachments": "attachments/"
/* practice session example */
"id": "a96e2ccd-1eb1-49fc-8d90-48827ae382c1",
"name": "Zep Runthrough",
"content": "Play through songlists for Zep Songs,to remember each.",
"practiceResources": [],
"songLearnList": null,
"learnSongs": [],
"songPlayList": {
"id": null,
"name": "Zeppelin Songs",
"description": "All the songs to know and play",
"songs": [
"id": null,
"name": "In the Light",
"description": null,
"artist": "Zep",
"style": null,
"notes": null,
"bpm": null,
"progress": null,
"songPortion": null,
"complexity": null,
"done": null,
"totalTimeHours": null,
"videoLink": null,
"scoreLink": null,
"instrumentUsed": null,
"guitarTuning": null,
"latestUpdate": null,
"repertoire": null,
"favorite": null,
"transcribe": null,
"priority": null,
"objectType": "songs",
"userId": null,
"_rid": null,
"_self": null,
"_ts": 0,
"_etag": null
"id": null,
"name": "Ten Years Gone",
"description": null,
"artist": "Zep",
"style": null,
"notes": null,
"bpm": null,
"progress": null,
"songPortion": null,
"complexity": null,
"done": null,
"totalTimeHours": null,
"videoLink": null,
"scoreLink": null,
"instrumentUsed": null,
"guitarTuning": null,
"latestUpdate": null,
"repertoire": null,
"favorite": null,
"transcribe": null,
"priority": null,
"objectType": "songs",
"userId": null,
"_rid": null,
"_self": null,
"_ts": 0,
"_etag": null
"objectType": "songPlayLists",
"userId": "b1185d7f-0fcb-4c5c-96b9-d145409de3ed",
"_rid": null,
"_self": null,
"_ts": 0,
"_etag": null
"playSongs": [],
"studyTasks": [],
"practiceGoals": [],
"exercise": [],
"objectType": "practiceSessions",
"userId": "b1185d7f-0fcb-4c5c-96b9-d145409de3ed",
"_rid": "rOcQAL3OQQExAAAAAAAAAA==",
"_self": "dbs/rOcQAA==/colls/rOcQAL3OQQE=/docs/rOcQAL3OQQExAAAAAAAAAA==/",
"_ts": 1418690921,
"_etag": "\"00008300-0000-0000-0000-548f81690000\"",
"_attachments": "attachments/"