Database first approach with automatic CRUD logging - entity-framework-6

Question

I have setup EF+ Audit as follows:
public partial class FocusConnection : DbContext
{
static FocusConnection()
{
AuditManager.DefaultConfiguration.AutoSavePreAction = (context, audit) =>
// ADD "Where(x => x.AuditEntryID == 0)" to allow multiple SaveChanges with same Audit
(context as FocusConnection).AuditEntries.AddRange(audit.Entries);
}
public override int SaveChanges()
{
var audit = new Audit();
audit.PreSaveChanges(this);
var rowAffecteds = base.SaveChanges();
audit.PostSaveChanges();
if (audit.Configuration.AutoSavePreAction != null)
{
audit.Configuration.AutoSavePreAction(this, audit);
base.SaveChanges();
}
return rowAffecteds;
}
public override Task<int> SaveChangesAsync()
{
return SaveChangesAsync(CancellationToken.None);
}
public override async Task<int> SaveChangesAsync(CancellationToken cancellationToken)
{
var audit = new Audit();
audit.PreSaveChanges(this);
var rowAffecteds = await base.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
audit.PostSaveChanges();
if (audit.Configuration.AutoSavePreAction != null)
{
audit.Configuration.AutoSavePreAction(this, audit);
await base.SaveChangesAsync(cancellationToken).ConfigureAwait(false);
}
return rowAffecteds;
}
}
I used a partial class to stay out to the text-templated original context generated by EF6. I used the following SQL script to generate the two table as-is:
CREATE TABLE [dbo].[AuditEntries] (
[AuditEntryID] [int] NOT NULL IDENTITY,
[EntitySetName] [nvarchar](255),
[EntityTypeName] [nvarchar](255),
[State] [int] NOT NULL,
[StateName] [nvarchar](255),
[CreatedBy] [nvarchar](255),
[CreatedDate] [datetime] NOT NULL,
CONSTRAINT [PK_dbo.AuditEntries] PRIMARY KEY ([AuditEntryID])
)
GO
CREATE TABLE [dbo].[AuditEntryProperties] (
[AuditEntryPropertyID] [int] NOT NULL IDENTITY,
[AuditEntryID] [int] NOT NULL,
[RelationName] [nvarchar](255),
[PropertyName] [nvarchar](255),
[OldValue] [nvarchar](max),
[NewValue] [nvarchar](max),
CONSTRAINT [PK_dbo.AuditEntryProperties] PRIMARY KEY ([AuditEntryPropertyID])
)
GO
CREATE INDEX [IX_AuditEntryID] ON [dbo].[AuditEntryProperties]([AuditEntryID])
GO
ALTER TABLE [dbo].[AuditEntryProperties]
ADD CONSTRAINT [FK_dbo.AuditEntryProperties_dbo.AuditEntries_AuditEntryID]
FOREIGN KEY ([AuditEntryID])
REFERENCES [dbo].[AuditEntries] ([AuditEntryID])
ON DELETE CASCADE
GO
I'm getting an error in the static constructor:
static FocusConnection()
{
AuditManager.DefaultConfiguration.AutoSavePreAction = (context, audit) =>
// ADD "Where(x => x.AuditEntryID == 0)" to allow multiple SaveChanges with same Audit
(context as FocusConnection).AuditEntries.AddRange(audit.Entries);
}
Error on AuditEntries.AddRange(audit.Entries):
CS1503 Argument 1: cannot convert from System.Collections.Generic.List<Z.EntityFramework.Plus.AuditEntry> to System.Collections.Generic.IEnumerable<DA.Systems.Focus.Data.EntityFramework.FocusOrm.AuditEntry>
Am I missing something?

Answer 1

You use Database First.
The AuditEntry class from EF+ is not the same as the one generated by your context.
You need to Import value.
AuditManager.DefaultConfiguration.AutoSavePreAction = (context, audit) =>
{
// ADD "Where(x => x.AuditEntryID == 0)" to allow multiple SaveChanges with same Audit
var customAuditEntries = audit.Entries.Select(x => Import(x));
(context as Entities).AuditEntries.AddRange(customAuditEntries);
};
using (var ctx = new Entities())
{
Audit audit = new Audit();
audit.CreatedBy = "ZZZ Projects"; // Optional
ctx.Entity_Basic.Add(new Entity_Basic() {ColumnInt = 2});
ctx.SaveChanges(audit);
}
public AuditEntry Import(Z.EntityFramework.Plus.AuditEntry entry)
{
var customAuditEntry = new AuditEntry
{
EntitySetName = entry.EntitySetName,
EntityTypeName = entry.EntityTypeName,
State = (int)entry.State,
StateName = entry.StateName,
CreatedBy = entry.CreatedBy,
CreatedDate = entry.CreatedDate
};
customAuditEntry.AuditEntryProperties = entry.Properties.Select(x => Import(x)).ToList();
return customAuditEntry;
}
public AuditEntryProperty Import(Z.EntityFramework.Plus.AuditEntryProperty property)
{
var customAuditEntry = new AuditEntryProperty
{
RelationName = property.RelationName,
PropertyName = property.PropertyName,
OldValue = property.OldValueFormatted,
NewValue = property.NewValueFormatted
};
return customAuditEntry;
}