如何在ArrangoDB中创建组合键

Question

I used ArangoDB.Client in C#. I am creating a resource class and making ResourceId and Locale as composite key.

public class Resource
{
    [Key, Column(Order = 1)]
    public Guid ResourceId {get; set;}
    [Key, Column(Order = 2)]
    [MaxLength(5)]
    public string Locale {get; set;}
    public string ResourceName {get; set;}
}

Above class doesn't work. I have to use as below and require to combine ResourceId and Locale to save as key.

public class Resource
{
    [DocumentProperty(Identifier = IdentifierType.Key)]
    public string Key { get; set; }
    public Guid ResourceId {get; set;}
    [MaxLength(5)]
    public string Locale {get; set;}
    public string ResourceName {get; set;}
}

Please advice any other idea!

Answer 1

ArangoDB key can only be set on one attribute named _key . with c# client you can only specify which one of class members should be translate to _key attribute.

I didn't do this myself but you can concat ResourceId and Locale and set it to Key (just be aware keys should be at most 254 bytes long)

public string Key => $"{ResourceId.ToString("N")}_{Locale}";

Or if you want these fields to be unique for each document, you can create a unique hash index on ResourceId and Locale and behave them as normal attributes.