SQLite.Net Extensions with multiple foreign keys - sqlite-net-extensions

Question

I am getting the following error when attempting to create a one-to-many relationship that has a multi value foreign key...
**
SQLite.Net.SQLiteException : foreign key mismatch - "Activity" referencing "Node"
**
This is the table SQL (simplified for clarity)...
CREATE TABLE [Activity] (
[ID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
[InstId_FK] numeric(18,0) NOT NULL,
[NodeSeq_FK] numeric(3,0) NOT NULL,
[ActivityType] int NOT NULL,
CONSTRAINT [Node_FK] FOREIGN KEY([InstId_FK], [NodeSeq_FK]) REFERENCES [Node]([ID], [NodeSeq])ON DELETE CASCADE);
CREATE TABLE [Node] (
[ID] NUMERIC(18) NOT NULL CONSTRAINT [ID] REFERENCES [Trip]([ID]) ON DELETE CASCADE,
[NodeSeq] numeric(3,0) NOT NULL,
[Status] int,
[Name] nvarchar(30) NOT NULL,
CONSTRAINT [sqlite_autoindex_TripNode_1] PRIMARY KEY ([ID], [NodeSeq]));
And my C# Models (again simplified for clarity)...
public class TripNodeActivity : LocationAware
{
[PrimaryKey, AutoIncrement, ForeignKey(typeof(Node),Order = 1)]
public int Id { get; set; }
[Column("InstId_FK")]
public int InstIdFk { get; set; }
[Column("NodeSeq_FK"), ForeignKey(typeof(Node),Order = 2)]
public int NodeSeqFk { get; set; }
public int ActivityType { get; set; }
}
public class Node
{
public Node(){Activity = new List<Activity>();}
[OneToMany(CascadeOperations = CascadeOperation.All)]
public List<Activity> Activity{get;set;}
[PrimaryKey, ForeignKey(typeof(Trip))]
public int Id { get; set; }
[PrimaryKey]
public int NodeSeq { get; set; }
public int Status { get; set; }
public String Name { get; set; }
}
This error happens when trying to save the model using:
SQLiteConnection.InsertOrReplaceWithChildren(NodeFromAbove,true)

Answer 1

Few things there.
First, you have two PrimaryKey attributes in Node class. That is not supported in SQLite-Net.
Second, you are specifying that the PrimaryKey is also a ForeignKey for another table in both classes. That's not what you want to do.
Probably this is more likely what you were trying:
public class TripNodeActivity : LocationAware
{
[PrimaryKey, AutoIncrement]
public int Id { get; set; }
[Column("InstId_FK")]
public int InstIdFk { get; set; }
[Column("NodeSeq_FK"), ForeignKey(typeof(Node)]
public int NodeSeqFk { get; set; }
public int ActivityType { get; set; }
}
public class Node
{
public Node(){Activity = new List<Activity>();}
[OneToMany(CascadeOperations = CascadeOperation.All)]
public List<Activity> Activity{get;set;}
[PrimaryKey]
public int Id { get; set; }
public int NodeSeq { get; set; }
public int Status { get; set; }
public String Name { get; set; }
}
Hope it helps.