如何将Relational()重构为NetCore3.0

Question

我不知道如何选择修改后的属性。

private void ApplySnakeCaseNames(ModelBuilder modelBuilder)
{
var mapper = new NpgsqlSnakeCaseNameTranslator();

        foreach (var entity in modelBuilder.Model.GetEntityTypes())
        {
            // modify column names
            foreach (var property in entity.GetProperties())
            {
                property.Relational().ColumnName = mapper.TranslateMemberName(property.Relational().ColumnName);
            }

            // modify table name
            entity.Relational().TableName = mapper.TranslateMemberName(entity.Relational().TableName);

            // move asp_net tables into schema 'identity'
            if (entity.Relational().TableName.StartsWith("asp_net_"))
            {
                entity.Relational().TableName = entity.Relational().TableName.Replace("asp_net_", string.Empty);
                entity.Relational().Schema = "identity";
            }
        }
    }

我期望保留原件的输出。

Answer 1

对于IMutableEntityType和IMutableProperty，它们公开方法而不是属性来更改名称。

尝试如下所示：

        foreach (var entity in modelBuilder.Model.GetEntityTypes())
        {
            // modify column names
            foreach (var property in entity.GetProperties())
            {
                property.SetColumnName(mapper.TranslateMemberName(property.GetColumnName()));
            }

            // modify table name
            entity.SetTableName(mapper.TranslateMemberName(entity.GetTableName()));

            // move asp_net tables into schema 'identity'
            if (entity.GetTableName().StartsWith("asp_net_"))
            {
                entity.SetTableName(entity.GetTableName().Replace("asp_net_", string.Empty));
                entity.SetSchema("identity");
            }
        }

Answer 2

这是Entity Framework Core 3中的重大变化

IProperty.Relational().ColumnName -> IProperty.GetColumnName()

参考：https://docs.microsoft.com/en-us/ef/core/what-is-new/ef-core-3.0/breaking-changes#id=%22provider-specific-metadata-api-changes%22