Im using Umbraco 12.

Back in v8 i could do the things like this

        [TableName("ExypnosSalesContent")]
        [PrimaryKey("Id", AutoIncrement = true)]
        [ExplicitColumns]
        public class ExypnosSalesContent
        {
            [PrimaryKeyColumn(AutoIncrement = true, IdentitySeed = 1)]
            [Column("id")]
            public int Id { get; set; }
            [Column("productId")]
            public int ProductId { get; set; }
            [Column("variantKey")]
            public Guid VariantKey { get; set; }
            public string? ProductName { 
                get {
                    IPublishedContent product = Umbraco.Content(this.ProductId);

                    return product.Name;
                } 
            }
        }

However in v12 I cant figure out how to do this.

This is what I have

   public class ExypnosSalesContentAddTable : MigrationBase
    {
        private readonly IScopeProvider _scopeProvider;
        private readonly IPublishedContentQuery _publishedContentQuery;

        public ExypnosSalesContentAddTable(IMigrationContext context, 
            IScopeProvider scopeProvider,
            IPublishedContentQuery publishedContentQuery) : base(context)
        {
            _scopeProvider = scopeProvider;
            _publishedContentQuery = publishedContentQuery;
        }

        [TableName("ExypnosSalesContent")]
        [PrimaryKey("Id", AutoIncrement = true)]
        [ExplicitColumns]
        public class ExypnosSalesContent
        {
            [PrimaryKeyColumn(AutoIncrement = true, IdentitySeed = 1)]
            [Column("id")]
            public int Id { get; set; }
            [Column("productId")]
            public int ProductId { get; set; }
            public string? ProductName { 
                get {
                    IPublishedContent product = _publishedContentQuery.Content(this.ProductId);

                    return product.Name;
                } 
            }
        }
    }

_PublisherContentQuery is not null here

error

CS0120 object referance is required for non-static field, methos or property

How do I do this in v12