It is possible to get a IQueryable<B> ProjectToB(IQueryable<A> query) which can be used as
context.ASet.ProjectToB().ToListAsync();
Is your feature request related to a problem? Please describe.
We have a generic class like follows:
class BaseRepository<TEntity, TModel>
{
public BaseRepository(DbSet<TEntity> dbSet, Func<IQueryable<TEntity>, IQueryable<TModel>> projectToModel) { ... }
public async Task<List<TModel>> GetAll()
{
return await _projectToModel(
_dbSet.Where(x => x.SomeCondition)
)
.Where(x => x.IsSomething)
.ToListAsync();
}
}
class UserRepository : BaseRepository<UserEntity, UserModel>
{
public UserRepository(DbContext c) : base(c.Users, UserMapper.ProjectToModel) {}
}
static partial class UserMapper
{
public static partial IQueryable<UserModel> ProjectToModel(this IQueryable<UserEntity> q);
}Describe the solution you'd like
I would prefer being able to create an Expression<Func<A, B>> and give it to my base repository.
class BaseRepository<TEntity, TModel>
{
public BaseRepository(DbSet<TEntity> dbSet, Expression<Func<TEntity, TModel>> projectToModel) { ... }
public async Task<List<TModel>> GetAll()
{
return await _dbSet
.Where(x => x.SomeCondition)
.Select(_projectToModel)
.Where(x => x.IsSomething)
.ToListAsync();
}
}
class UserRepository : BaseRepository<UserEntity, UserModel>
{
public UserRepository(DbContext c) : base(c.Users, UserMapper.CreateToModelProjection()) {}
}
static partial class UserMapper
{
public static partial Expression<Func<UserModel, UserEntity>> CreateToModelProjection()
}This will make the query cleaner and easier to read.
Describe alternatives you've considered
The aforementioned code works, but I'd prefer the new variant.
Additional context
I'm happy to hear your opinions on this matter.
It is possible to get a
IQueryable<B> ProjectToB(IQueryable<A> query)which can be used asIs your feature request related to a problem? Please describe.
We have a generic class like follows:
Describe the solution you'd like
I would prefer being able to create an
Expression<Func<A, B>>and give it to my base repository.This will make the query cleaner and easier to read.
Describe alternatives you've considered
The aforementioned code works, but I'd prefer the new variant.
Additional context
I'm happy to hear your opinions on this matter.