/C#/Entity framework update child records

Entity framework update child records

public void Update(UpdateParentModel model)
{
    var existingParent = _dbContext.Parents
        .Where(p => p.Id == model.Id)
        .Include(p => p.Children)
        .SingleOrDefault();

    if (existingParent != null)
    {
        // Update parent
        _dbContext.Entry(existingParent).CurrentValues.SetValues(model);

        // Delete children
        foreach (var existingChild in existingParent.Children.ToList())
        {
            if (!model.Children.Any(c => c.Id == existingChild.Id))
                _dbContext.Children.Remove(existingChild);
        }

        // Update and Insert children
        foreach (var childModel in model.Children)
        {
            var existingChild = existingParent.Children
                .Where(c => c.Id == childModel.Id)
                .SingleOrDefault();

            if (existingChild != null)
                // Update child
                _dbContext.Entry(existingChild).CurrentValues.SetValues(childModel);
            else
            {
                // Insert child
                var newChild = new Child
                {
                    Data = childModel.Data,
                    //...
                };
                existingParent.Children.Add(newChild);
            }
        }

        _dbContext.SaveChanges();
    }
}

Source: stackoverflow.com

Similar codes

2 votes306 views1 answer
New Color from hex in unity
C#Unity
2 votes265 views1 answer
To create Blazor project using CLI
C#
44 votes268 views5 answers
C# error messagebox
C#
0 vote265 views1 answer
Arabic lorem ipsum
C#
7 votes237 views2 answers
Unity copy to clipboard
C#Unity
43 votes204 views2 answers
How to change the scale of an object in unity
C#
0 vote229 views1 answer
True false when key pressed in c sharp unity
C#
32 votes299 views4 answers
C# list add to list
C#
0 vote272 views1 answer
Query into complex object using dapper
C#
0 vote268 views1 answer
Asp net c# browser cursor wait
C#