From c9628a2aefa179c1f95ed66a2ecbea72c1a8f22c Mon Sep 17 00:00:00 2001
From: collinbarrett <collinbarrett@users.noreply.github.com>
Date: Mon, 10 Sep 2018 13:13:46 -0500
Subject: [PATCH] wip

ref #308
---
 .../Seed/Extensions/SeedFilterListsDbContext.cs   | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/FilterLists.Data/Seed/Extensions/SeedFilterListsDbContext.cs b/src/FilterLists.Data/Seed/Extensions/SeedFilterListsDbContext.cs
index 248ae0e74..364ec9fa1 100644
--- a/src/FilterLists.Data/Seed/Extensions/SeedFilterListsDbContext.cs
+++ b/src/FilterLists.Data/Seed/Extensions/SeedFilterListsDbContext.cs
@@ -30,11 +30,13 @@ public static void SeedOrUpdate(this FilterListsDbContext dbContext, string data
             dbContext.SeedOrUpdate<SoftwareSyntax>(dataPath);
         }
 
-        private static void SeedOrUpdate<TEntity>(this DbContext dbContext, string dataPath) where TEntity : IBaseEntity
+        private static void SeedOrUpdate<TEntity>(this DbContext dbContext, string dataPath)
+            where TEntity : class, IBaseEntity
         {
             var entityType = dbContext.Model.FindEntityType(typeof(TEntity));
             var properties = GetPropertiesLessValueGeneratedTimestamps(entityType);
             var seedRows = GetSeedRows<TEntity>(dataPath);
+            Delete(dbContext, seedRows);
             InsertOnDuplicateKeyUpdate(dbContext, properties, entityType, seedRows);
         }
 
@@ -57,6 +59,17 @@ private static List<TEntity> GetSeedRows<TEntity>(string dataPath) where TEntity
             }
         }
 
+        private static void Delete<TEntity>(DbContext dbContext, IEnumerable<TEntity> seedRows)
+            where TEntity : class, IBaseEntity
+        {
+            var idProperties = typeof(TEntity).GetProperties().Where(p => p.Name.Contains("Id"));
+            var toRemove = dbContext.Set<TEntity>()
+                                    .Select(s => idProperties)
+                                    .Except(seedRows.Select(s => idProperties));
+            dbContext.RemoveRange(toRemove);
+            dbContext.SaveChanges();
+        }
+
         private static void InsertOnDuplicateKeyUpdate<TEntity>(DbContext dbContext,
             IReadOnlyCollection<IProperty> properties, IEntityType entityType, IEnumerable<TEntity> seedRows)
             where TEntity : IBaseEntity