Entity Framework Core - REST json merge patch (Partial Update)

c# entity-framework entity-framework-core rest

Question

EF Core supports Json Patch - RFC6902

https://github.com/aspnet/JsonPatch

I wanted to add support for Json Merge Patch in my app - RFC7396

I am new to entity framework.

I tried following, it works fine, but wanted to know if the implementation is alright (model validation being handled in a filter, so please ignore that part):

[HttpPatch("{id}")]
public async Task<IActionResult> Update(int id, [FromBody] TEntity updatedEntity)
{
    TEntity entity = repository.GetById<TEntity>(id);
    if (entity == null)
    {
         return NotFound(new { message = $"{EntityName} does not exist!" });
    }
    repository.Update(entity, updatedEntity);
    await repository.SaveAsync();
    return NoContent();
}

And in the repository:

public void Update<TEntity>(TEntity entity, TEntity updatedEntity) where TEntity : class, IEntity
{
    updatedEntity.Id = entity.Id;
    PropertyInfo[] properties = entity.GetType().GetProperties();
    foreach (PropertyInfo propertyInfo in properties)
    {
        if (propertyInfo.GetValue(updatedEntity, null) != null)
        {
            propertyInfo.SetValue(entity, propertyInfo.GetValue(updatedEntity, null), null);
        }
    }
    entity.ModifiedDate = DateTime.UtcNow;
    context.Entry(entity).Property(e => e.CreatedDate).IsModified = false;
}
1
4
1/5/2017 12:30:49 PM

Popular Answer

Its a bad pattern to use entity types, which reflect an internal schema (your database) in external interfaces (your api).

but for a partial update you can use dynamic like this:

dynamic changedData = new { /* props you wanna change */ };
DataContext.Entry(yourEntity).CurrentValues.SetValues(changedData);
2
3/17/2017 6:58:58 AM


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