PatchExample

A way of handling a patch request without any extra dependencies. This method allows one or more properties to be updated in one go (limitation being that they cannot be set to null).

Important Files

Weather.cs

This is the main model for the database, and contains all of the properties of the object.

WeatherUpdate.cs

This is the update object. This should contain any properties of the above file that should be updatable. Any properties must match the above objects properties exactly.

WeatherRepository.cs

Contains the actual implmenetation for updating the existing entity properties with the ones from the update model.

public Weather Update(int id, WeatherUpdate updateObject)
{
    // find existing entity
    var existingEntity = _context.Weather.Find(id);
    
    // handle not found
    if (existingEntity == null)
    {
        throw new EntityNotFoundException(id);
    }

    // iterate through all of the properties of the update object
    // in this example it includes all properties apart from `id`
    foreach (PropertyInfo prop in updateObject.GetType().GetProperties())
    {
        // check if the property has been set in the updateObject
        // if it is null we ignore it. If you want to allow null values to be set, you could add a flag to the update object to allow specific nulls
        if (prop.GetValue(updateObject) != null)
        {
            // if it has been set update the existing entity value
            existingEntity.GetType().GetProperty(prop.Name)?.SetValue(existingEntity, prop.GetValue(updateObject));               
        }
    }
    _context.SaveChanges();
    return existingEntity;
}