EF Core linq and conditional include and theninclude problem












2















I am having a problem with getting a result when trying to get objects with multiple levels.
This is what I am trying to do roughly:



_context.Investors.Where(s => s.Id == userId)
.Include(c => c.Coins) //only want this if some kind of flag is given by the user.
.ThenInclude(ct => ct.CoinType)
.Include(c => c.Bricks) //only want this if some kind of flag is given by the user.


Essentially I am getting a lot of flags indicating if I should include parts of the object.
I got it almost to work. Like this:



_context.Investors.Where(s => s.Id == userId)
.Select(i => new
{
i,
Bricks = (details & GapiInvestorFlags.Bricks) != GapiInvestorFlags.Bricks ? null : i.Bricks,
Offers = (details & GapiInvestorFlags.Offers) != GapiInvestorFlags.Offers ? null : i.Offers,
Coins = (details & GapiInvestorFlags.Coins) != GapiInvestorFlags.Coins ? null : i.Coins,
CoinTransactions = (details & GapiInvestorFlags.CoinTransactions) != GapiInvestorFlags.CoinTransactions ? null : i.CoinTransactions,
OfferTransactions = (details & GapiInvestorFlags.OfferTransactions) != GapiInvestorFlags.OfferTransactions ? null : i.OfferTransactions,
BuyTransactions = (details & GapiInvestorFlags.BuyTransactions) != GapiInvestorFlags.BuyTransactions ? null : i.BuyTransactions,
SellTransactions = (details & GapiInvestorFlags.SellTransactions) != GapiInvestorFlags.SellTransactions ? null : i.SellTransactions
}).AsEnumerable()
.Select(e => e.i).FirstOrDefault();


This works except that the Coins section also has a cointype in it so I need to include it too. But when I add my code, the whole section stops working.



This is what I tried:



_context.Investors.Where(s => s.Id == userId)
.Include(c => c.Coins)
.ThenInclude(ct => ct.CoinType)
.Select(i => new
{
i,
Bricks = (details & GapiInvestorFlags.Bricks) != GapiInvestorFlags.Bricks ? null : i.Bricks,
Offers = (details & GapiInvestorFlags.Offers) != GapiInvestorFlags.Offers ? null : i.Offers,
Coins = (details & GapiInvestorFlags.Coins) != GapiInvestorFlags.Coins ? null : i.Coins.Select(c => new { c, c.CoinType }).ToList(),
CoinTransactions = (details & GapiInvestorFlags.CoinTransactions) != GapiInvestorFlags.CoinTransactions ? null : i.CoinTransactions,
OfferTransactions = (details & GapiInvestorFlags.OfferTransactions) != GapiInvestorFlags.OfferTransactions ? null : i.OfferTransactions,
BuyTransactions = (details & GapiInvestorFlags.BuyTransactions) != GapiInvestorFlags.BuyTransactions ? null : i.BuyTransactions,
SellTransactions = (details & GapiInvestorFlags.SellTransactions) != GapiInvestorFlags.SellTransactions ? null : i.SellTransactions
}).AsEnumerable()
.Select(e => e.i).FirstOrDefault();


I really can't tell why it does not work.



Basically when I change:



i.Coins


To



i.Coins.Select(c => new { c, c.CoinType }).ToList()


it stops working.










share|improve this question




















  • 1





    Essentially I am getting a lot of flags indicating if I should include parts of the object - looks like your query doing to much, consider having different queries for the flags

    – Fabio
    Nov 26 '18 at 5:55


















2















I am having a problem with getting a result when trying to get objects with multiple levels.
This is what I am trying to do roughly:



_context.Investors.Where(s => s.Id == userId)
.Include(c => c.Coins) //only want this if some kind of flag is given by the user.
.ThenInclude(ct => ct.CoinType)
.Include(c => c.Bricks) //only want this if some kind of flag is given by the user.


Essentially I am getting a lot of flags indicating if I should include parts of the object.
I got it almost to work. Like this:



_context.Investors.Where(s => s.Id == userId)
.Select(i => new
{
i,
Bricks = (details & GapiInvestorFlags.Bricks) != GapiInvestorFlags.Bricks ? null : i.Bricks,
Offers = (details & GapiInvestorFlags.Offers) != GapiInvestorFlags.Offers ? null : i.Offers,
Coins = (details & GapiInvestorFlags.Coins) != GapiInvestorFlags.Coins ? null : i.Coins,
CoinTransactions = (details & GapiInvestorFlags.CoinTransactions) != GapiInvestorFlags.CoinTransactions ? null : i.CoinTransactions,
OfferTransactions = (details & GapiInvestorFlags.OfferTransactions) != GapiInvestorFlags.OfferTransactions ? null : i.OfferTransactions,
BuyTransactions = (details & GapiInvestorFlags.BuyTransactions) != GapiInvestorFlags.BuyTransactions ? null : i.BuyTransactions,
SellTransactions = (details & GapiInvestorFlags.SellTransactions) != GapiInvestorFlags.SellTransactions ? null : i.SellTransactions
}).AsEnumerable()
.Select(e => e.i).FirstOrDefault();


This works except that the Coins section also has a cointype in it so I need to include it too. But when I add my code, the whole section stops working.



This is what I tried:



_context.Investors.Where(s => s.Id == userId)
.Include(c => c.Coins)
.ThenInclude(ct => ct.CoinType)
.Select(i => new
{
i,
Bricks = (details & GapiInvestorFlags.Bricks) != GapiInvestorFlags.Bricks ? null : i.Bricks,
Offers = (details & GapiInvestorFlags.Offers) != GapiInvestorFlags.Offers ? null : i.Offers,
Coins = (details & GapiInvestorFlags.Coins) != GapiInvestorFlags.Coins ? null : i.Coins.Select(c => new { c, c.CoinType }).ToList(),
CoinTransactions = (details & GapiInvestorFlags.CoinTransactions) != GapiInvestorFlags.CoinTransactions ? null : i.CoinTransactions,
OfferTransactions = (details & GapiInvestorFlags.OfferTransactions) != GapiInvestorFlags.OfferTransactions ? null : i.OfferTransactions,
BuyTransactions = (details & GapiInvestorFlags.BuyTransactions) != GapiInvestorFlags.BuyTransactions ? null : i.BuyTransactions,
SellTransactions = (details & GapiInvestorFlags.SellTransactions) != GapiInvestorFlags.SellTransactions ? null : i.SellTransactions
}).AsEnumerable()
.Select(e => e.i).FirstOrDefault();


I really can't tell why it does not work.



Basically when I change:



i.Coins


To



i.Coins.Select(c => new { c, c.CoinType }).ToList()


it stops working.










share|improve this question




















  • 1





    Essentially I am getting a lot of flags indicating if I should include parts of the object - looks like your query doing to much, consider having different queries for the flags

    – Fabio
    Nov 26 '18 at 5:55
















2












2








2


2






I am having a problem with getting a result when trying to get objects with multiple levels.
This is what I am trying to do roughly:



_context.Investors.Where(s => s.Id == userId)
.Include(c => c.Coins) //only want this if some kind of flag is given by the user.
.ThenInclude(ct => ct.CoinType)
.Include(c => c.Bricks) //only want this if some kind of flag is given by the user.


Essentially I am getting a lot of flags indicating if I should include parts of the object.
I got it almost to work. Like this:



_context.Investors.Where(s => s.Id == userId)
.Select(i => new
{
i,
Bricks = (details & GapiInvestorFlags.Bricks) != GapiInvestorFlags.Bricks ? null : i.Bricks,
Offers = (details & GapiInvestorFlags.Offers) != GapiInvestorFlags.Offers ? null : i.Offers,
Coins = (details & GapiInvestorFlags.Coins) != GapiInvestorFlags.Coins ? null : i.Coins,
CoinTransactions = (details & GapiInvestorFlags.CoinTransactions) != GapiInvestorFlags.CoinTransactions ? null : i.CoinTransactions,
OfferTransactions = (details & GapiInvestorFlags.OfferTransactions) != GapiInvestorFlags.OfferTransactions ? null : i.OfferTransactions,
BuyTransactions = (details & GapiInvestorFlags.BuyTransactions) != GapiInvestorFlags.BuyTransactions ? null : i.BuyTransactions,
SellTransactions = (details & GapiInvestorFlags.SellTransactions) != GapiInvestorFlags.SellTransactions ? null : i.SellTransactions
}).AsEnumerable()
.Select(e => e.i).FirstOrDefault();


This works except that the Coins section also has a cointype in it so I need to include it too. But when I add my code, the whole section stops working.



This is what I tried:



_context.Investors.Where(s => s.Id == userId)
.Include(c => c.Coins)
.ThenInclude(ct => ct.CoinType)
.Select(i => new
{
i,
Bricks = (details & GapiInvestorFlags.Bricks) != GapiInvestorFlags.Bricks ? null : i.Bricks,
Offers = (details & GapiInvestorFlags.Offers) != GapiInvestorFlags.Offers ? null : i.Offers,
Coins = (details & GapiInvestorFlags.Coins) != GapiInvestorFlags.Coins ? null : i.Coins.Select(c => new { c, c.CoinType }).ToList(),
CoinTransactions = (details & GapiInvestorFlags.CoinTransactions) != GapiInvestorFlags.CoinTransactions ? null : i.CoinTransactions,
OfferTransactions = (details & GapiInvestorFlags.OfferTransactions) != GapiInvestorFlags.OfferTransactions ? null : i.OfferTransactions,
BuyTransactions = (details & GapiInvestorFlags.BuyTransactions) != GapiInvestorFlags.BuyTransactions ? null : i.BuyTransactions,
SellTransactions = (details & GapiInvestorFlags.SellTransactions) != GapiInvestorFlags.SellTransactions ? null : i.SellTransactions
}).AsEnumerable()
.Select(e => e.i).FirstOrDefault();


I really can't tell why it does not work.



Basically when I change:



i.Coins


To



i.Coins.Select(c => new { c, c.CoinType }).ToList()


it stops working.










share|improve this question
















I am having a problem with getting a result when trying to get objects with multiple levels.
This is what I am trying to do roughly:



_context.Investors.Where(s => s.Id == userId)
.Include(c => c.Coins) //only want this if some kind of flag is given by the user.
.ThenInclude(ct => ct.CoinType)
.Include(c => c.Bricks) //only want this if some kind of flag is given by the user.


Essentially I am getting a lot of flags indicating if I should include parts of the object.
I got it almost to work. Like this:



_context.Investors.Where(s => s.Id == userId)
.Select(i => new
{
i,
Bricks = (details & GapiInvestorFlags.Bricks) != GapiInvestorFlags.Bricks ? null : i.Bricks,
Offers = (details & GapiInvestorFlags.Offers) != GapiInvestorFlags.Offers ? null : i.Offers,
Coins = (details & GapiInvestorFlags.Coins) != GapiInvestorFlags.Coins ? null : i.Coins,
CoinTransactions = (details & GapiInvestorFlags.CoinTransactions) != GapiInvestorFlags.CoinTransactions ? null : i.CoinTransactions,
OfferTransactions = (details & GapiInvestorFlags.OfferTransactions) != GapiInvestorFlags.OfferTransactions ? null : i.OfferTransactions,
BuyTransactions = (details & GapiInvestorFlags.BuyTransactions) != GapiInvestorFlags.BuyTransactions ? null : i.BuyTransactions,
SellTransactions = (details & GapiInvestorFlags.SellTransactions) != GapiInvestorFlags.SellTransactions ? null : i.SellTransactions
}).AsEnumerable()
.Select(e => e.i).FirstOrDefault();


This works except that the Coins section also has a cointype in it so I need to include it too. But when I add my code, the whole section stops working.



This is what I tried:



_context.Investors.Where(s => s.Id == userId)
.Include(c => c.Coins)
.ThenInclude(ct => ct.CoinType)
.Select(i => new
{
i,
Bricks = (details & GapiInvestorFlags.Bricks) != GapiInvestorFlags.Bricks ? null : i.Bricks,
Offers = (details & GapiInvestorFlags.Offers) != GapiInvestorFlags.Offers ? null : i.Offers,
Coins = (details & GapiInvestorFlags.Coins) != GapiInvestorFlags.Coins ? null : i.Coins.Select(c => new { c, c.CoinType }).ToList(),
CoinTransactions = (details & GapiInvestorFlags.CoinTransactions) != GapiInvestorFlags.CoinTransactions ? null : i.CoinTransactions,
OfferTransactions = (details & GapiInvestorFlags.OfferTransactions) != GapiInvestorFlags.OfferTransactions ? null : i.OfferTransactions,
BuyTransactions = (details & GapiInvestorFlags.BuyTransactions) != GapiInvestorFlags.BuyTransactions ? null : i.BuyTransactions,
SellTransactions = (details & GapiInvestorFlags.SellTransactions) != GapiInvestorFlags.SellTransactions ? null : i.SellTransactions
}).AsEnumerable()
.Select(e => e.i).FirstOrDefault();


I really can't tell why it does not work.



Basically when I change:



i.Coins


To



i.Coins.Select(c => new { c, c.CoinType }).ToList()


it stops working.







.net entity-framework .net-core entity-framework-core






share|improve this question















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share|improve this question




share|improve this question








edited Nov 26 '18 at 8:03









Ivan Stoev

103k774126




103k774126










asked Nov 26 '18 at 3:29









zawiszazawisza

542517




542517








  • 1





    Essentially I am getting a lot of flags indicating if I should include parts of the object - looks like your query doing to much, consider having different queries for the flags

    – Fabio
    Nov 26 '18 at 5:55
















  • 1





    Essentially I am getting a lot of flags indicating if I should include parts of the object - looks like your query doing to much, consider having different queries for the flags

    – Fabio
    Nov 26 '18 at 5:55










1




1





Essentially I am getting a lot of flags indicating if I should include parts of the object - looks like your query doing to much, consider having different queries for the flags

– Fabio
Nov 26 '18 at 5:55







Essentially I am getting a lot of flags indicating if I should include parts of the object - looks like your query doing to much, consider having different queries for the flags

– Fabio
Nov 26 '18 at 5:55














1 Answer
1






active

oldest

votes


















3














The technique you are using is not really explicit loading (Include / ThenInclude), but trick based on projection and EF Core navigation property fix-up, so I can't say why it stops working. EF Core still processes projections and includes differently, so it might be a defect in the current processing.



Implementing conditional include at the root query level is relatively easy. Note that the Include method starts from (is defined for) IQueryable<TEntity> and the returned IIncludableQueryable<TEntity, TPreviousProperty>> is also IQueryable<TEntity>. Which means you can keep IQueryable<T> query variable and apply conditional transformations similar to chained Where operators.



To make that easier, you could create a custom helper extension method like this:



public static IQueryable<T> If<T>(
this IQueryable<T> source,
bool condition,
Func<IQueryable<T>, IQueryable<T>> transform
)
{
return condition? transform(source) : source;
}


and use it like this:



_context.Investors.Where(s => s.Id == userId)
.If(flagCoins, q => q.Include(e => e.Coins)
.ThenInclude(e => e.CoinType))
.If(flagBricks, q => q.Include(e => e.Bricks))


If you need something similar for the nested levels (ThenInclude), then add the following 2 extension methods:



public static IQueryable<T> If<T, P>(
this IIncludableQueryable<T, P> source,
bool condition,
Func<IIncludableQueryable<T, P>, IQueryable<T>> transform
)
where T : class
{
return condition ? transform(source) : source;
}

public static IQueryable<T> If<T, P>(
this IIncludableQueryable<T, IEnumerable<P>> source,
bool condition,
Func<IIncludableQueryable<T, IEnumerable<P>>, IQueryable<T>> transform
)
where T : class
{
return condition ? transform(source) : source;
}


which will allow you to use something like this:



_context.Investors.Where(s => s.Id == userId)
.If(flagCoins, q => q.Include(e => e.Coins)
.If(flagCoinType, q2 => q2.ThenInclude(e => e.CoinType)))
.If(flagBricks, q => q.Include(e => e.Bricks))





share|improve this answer





















  • 1





    Thank you very much. this is so much better than what I was doing.

    – zawisza
    Nov 26 '18 at 9:14











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1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









3














The technique you are using is not really explicit loading (Include / ThenInclude), but trick based on projection and EF Core navigation property fix-up, so I can't say why it stops working. EF Core still processes projections and includes differently, so it might be a defect in the current processing.



Implementing conditional include at the root query level is relatively easy. Note that the Include method starts from (is defined for) IQueryable<TEntity> and the returned IIncludableQueryable<TEntity, TPreviousProperty>> is also IQueryable<TEntity>. Which means you can keep IQueryable<T> query variable and apply conditional transformations similar to chained Where operators.



To make that easier, you could create a custom helper extension method like this:



public static IQueryable<T> If<T>(
this IQueryable<T> source,
bool condition,
Func<IQueryable<T>, IQueryable<T>> transform
)
{
return condition? transform(source) : source;
}


and use it like this:



_context.Investors.Where(s => s.Id == userId)
.If(flagCoins, q => q.Include(e => e.Coins)
.ThenInclude(e => e.CoinType))
.If(flagBricks, q => q.Include(e => e.Bricks))


If you need something similar for the nested levels (ThenInclude), then add the following 2 extension methods:



public static IQueryable<T> If<T, P>(
this IIncludableQueryable<T, P> source,
bool condition,
Func<IIncludableQueryable<T, P>, IQueryable<T>> transform
)
where T : class
{
return condition ? transform(source) : source;
}

public static IQueryable<T> If<T, P>(
this IIncludableQueryable<T, IEnumerable<P>> source,
bool condition,
Func<IIncludableQueryable<T, IEnumerable<P>>, IQueryable<T>> transform
)
where T : class
{
return condition ? transform(source) : source;
}


which will allow you to use something like this:



_context.Investors.Where(s => s.Id == userId)
.If(flagCoins, q => q.Include(e => e.Coins)
.If(flagCoinType, q2 => q2.ThenInclude(e => e.CoinType)))
.If(flagBricks, q => q.Include(e => e.Bricks))





share|improve this answer





















  • 1





    Thank you very much. this is so much better than what I was doing.

    – zawisza
    Nov 26 '18 at 9:14
















3














The technique you are using is not really explicit loading (Include / ThenInclude), but trick based on projection and EF Core navigation property fix-up, so I can't say why it stops working. EF Core still processes projections and includes differently, so it might be a defect in the current processing.



Implementing conditional include at the root query level is relatively easy. Note that the Include method starts from (is defined for) IQueryable<TEntity> and the returned IIncludableQueryable<TEntity, TPreviousProperty>> is also IQueryable<TEntity>. Which means you can keep IQueryable<T> query variable and apply conditional transformations similar to chained Where operators.



To make that easier, you could create a custom helper extension method like this:



public static IQueryable<T> If<T>(
this IQueryable<T> source,
bool condition,
Func<IQueryable<T>, IQueryable<T>> transform
)
{
return condition? transform(source) : source;
}


and use it like this:



_context.Investors.Where(s => s.Id == userId)
.If(flagCoins, q => q.Include(e => e.Coins)
.ThenInclude(e => e.CoinType))
.If(flagBricks, q => q.Include(e => e.Bricks))


If you need something similar for the nested levels (ThenInclude), then add the following 2 extension methods:



public static IQueryable<T> If<T, P>(
this IIncludableQueryable<T, P> source,
bool condition,
Func<IIncludableQueryable<T, P>, IQueryable<T>> transform
)
where T : class
{
return condition ? transform(source) : source;
}

public static IQueryable<T> If<T, P>(
this IIncludableQueryable<T, IEnumerable<P>> source,
bool condition,
Func<IIncludableQueryable<T, IEnumerable<P>>, IQueryable<T>> transform
)
where T : class
{
return condition ? transform(source) : source;
}


which will allow you to use something like this:



_context.Investors.Where(s => s.Id == userId)
.If(flagCoins, q => q.Include(e => e.Coins)
.If(flagCoinType, q2 => q2.ThenInclude(e => e.CoinType)))
.If(flagBricks, q => q.Include(e => e.Bricks))





share|improve this answer





















  • 1





    Thank you very much. this is so much better than what I was doing.

    – zawisza
    Nov 26 '18 at 9:14














3












3








3







The technique you are using is not really explicit loading (Include / ThenInclude), but trick based on projection and EF Core navigation property fix-up, so I can't say why it stops working. EF Core still processes projections and includes differently, so it might be a defect in the current processing.



Implementing conditional include at the root query level is relatively easy. Note that the Include method starts from (is defined for) IQueryable<TEntity> and the returned IIncludableQueryable<TEntity, TPreviousProperty>> is also IQueryable<TEntity>. Which means you can keep IQueryable<T> query variable and apply conditional transformations similar to chained Where operators.



To make that easier, you could create a custom helper extension method like this:



public static IQueryable<T> If<T>(
this IQueryable<T> source,
bool condition,
Func<IQueryable<T>, IQueryable<T>> transform
)
{
return condition? transform(source) : source;
}


and use it like this:



_context.Investors.Where(s => s.Id == userId)
.If(flagCoins, q => q.Include(e => e.Coins)
.ThenInclude(e => e.CoinType))
.If(flagBricks, q => q.Include(e => e.Bricks))


If you need something similar for the nested levels (ThenInclude), then add the following 2 extension methods:



public static IQueryable<T> If<T, P>(
this IIncludableQueryable<T, P> source,
bool condition,
Func<IIncludableQueryable<T, P>, IQueryable<T>> transform
)
where T : class
{
return condition ? transform(source) : source;
}

public static IQueryable<T> If<T, P>(
this IIncludableQueryable<T, IEnumerable<P>> source,
bool condition,
Func<IIncludableQueryable<T, IEnumerable<P>>, IQueryable<T>> transform
)
where T : class
{
return condition ? transform(source) : source;
}


which will allow you to use something like this:



_context.Investors.Where(s => s.Id == userId)
.If(flagCoins, q => q.Include(e => e.Coins)
.If(flagCoinType, q2 => q2.ThenInclude(e => e.CoinType)))
.If(flagBricks, q => q.Include(e => e.Bricks))





share|improve this answer















The technique you are using is not really explicit loading (Include / ThenInclude), but trick based on projection and EF Core navigation property fix-up, so I can't say why it stops working. EF Core still processes projections and includes differently, so it might be a defect in the current processing.



Implementing conditional include at the root query level is relatively easy. Note that the Include method starts from (is defined for) IQueryable<TEntity> and the returned IIncludableQueryable<TEntity, TPreviousProperty>> is also IQueryable<TEntity>. Which means you can keep IQueryable<T> query variable and apply conditional transformations similar to chained Where operators.



To make that easier, you could create a custom helper extension method like this:



public static IQueryable<T> If<T>(
this IQueryable<T> source,
bool condition,
Func<IQueryable<T>, IQueryable<T>> transform
)
{
return condition? transform(source) : source;
}


and use it like this:



_context.Investors.Where(s => s.Id == userId)
.If(flagCoins, q => q.Include(e => e.Coins)
.ThenInclude(e => e.CoinType))
.If(flagBricks, q => q.Include(e => e.Bricks))


If you need something similar for the nested levels (ThenInclude), then add the following 2 extension methods:



public static IQueryable<T> If<T, P>(
this IIncludableQueryable<T, P> source,
bool condition,
Func<IIncludableQueryable<T, P>, IQueryable<T>> transform
)
where T : class
{
return condition ? transform(source) : source;
}

public static IQueryable<T> If<T, P>(
this IIncludableQueryable<T, IEnumerable<P>> source,
bool condition,
Func<IIncludableQueryable<T, IEnumerable<P>>, IQueryable<T>> transform
)
where T : class
{
return condition ? transform(source) : source;
}


which will allow you to use something like this:



_context.Investors.Where(s => s.Id == userId)
.If(flagCoins, q => q.Include(e => e.Coins)
.If(flagCoinType, q2 => q2.ThenInclude(e => e.CoinType)))
.If(flagBricks, q => q.Include(e => e.Bricks))






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edited Nov 27 '18 at 7:13

























answered Nov 26 '18 at 8:00









Ivan StoevIvan Stoev

103k774126




103k774126








  • 1





    Thank you very much. this is so much better than what I was doing.

    – zawisza
    Nov 26 '18 at 9:14














  • 1





    Thank you very much. this is so much better than what I was doing.

    – zawisza
    Nov 26 '18 at 9:14








1




1





Thank you very much. this is so much better than what I was doing.

– zawisza
Nov 26 '18 at 9:14





Thank you very much. this is so much better than what I was doing.

– zawisza
Nov 26 '18 at 9:14


















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