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implement https://stackoverflow.com/a/52264468/2343739

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ref #308
This commit is contained in:
Collin M. Barrett 2018-09-10 15:34:16 -05:00
parent 4bf0ecbd75
commit ed1ae929bd
1 changed files with 23 additions and 5 deletions
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28
src/FilterLists.Data/Seed/Extensions/SeedFilterListsDbContext.cs
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@ -2,6 +2,7 @@
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using FilterLists.Data.Entities;
using FilterLists.Data.Entities.Junctions;
using Microsoft.EntityFrameworkCore;
@ -59,14 +60,31 @@ private static List<TEntity> GetSeedRows<TEntity>(string dataPath) where TEntity
}
}
//https://stackoverflow.com/a/52264468/2343739
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);
var entityType = dbContext.Model.FindEntityType(typeof(TEntity));
var entityPrimaryKey = entityType.FindPrimaryKey();
var dbEntity = Expression.Parameter(entityType.ClrType, "e");
var matchAny = seedRows.Select(entity => entityPrimaryKey.Properties
.Select(p => Expression.Equal(
Expression.Property(dbEntity, p.PropertyInfo),
Expression.Property(Expression.Constant(entity), p.PropertyInfo)))
.Aggregate(Expression.AndAlso))
.Aggregate<BinaryExpression, Expression>(null,
(current, match) => current != null ? Expression.OrElse(current, match) : match);
var dbQuery = dbContext.Set<TEntity>().AsQueryable();
if (matchAny != null)
{
var predicate = Expression.Lambda<Func<TEntity, bool>>(Expression.Not(matchAny), dbEntity);
dbQuery = dbQuery.Where(predicate);
}
var dbEntities = dbQuery.ToList();
if (dbEntities.Count == 0)
return;
dbContext.RemoveRange(dbEntities);
dbContext.SaveChanges();
}