Modify query expression

[ghost]

Hi,

how to modify the expression before executing ?

Regards.

[rowanmiller]

@mfernandezruiz do you want to modify the raw SQL or the query tree?

[ghost]

The query tree

[rowanmiller]

cc @maumar @anpete - any pointers you can give?

[ghost]

I am implementing a soft delete feature, and need to modify the query tree
before IQueryProvider.Execute is invoked so I can then add conditions to
the query tree as needed. The purpose is to obtain an outcome of the query
where those entities with the flag IsDeleted set to true, are removed.

Merry xmas !

2015-12-23 22:51 GMT+01:00 Rowan Miller notifications@github.com:

cc @maumar https://github.com/maumar @anpete https://github.com/anpete

• any pointers you can give?

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Reply to this email directly or view it on GitHub
#4048 (comment)
.

[rowanmiller]

@anpete to provide some pointers

[santiag0sc]

Hello all !

I am pretty interested on the subject. As a gent reminder, do we have any news around this topic ?

VBRegards.
Santiago.

[anpete]

@mfernandezruiz @santiag0sc The easiest place right now to intercept the LINQ expression tree is probably IQueryCompiler.

The general approach would be to register a custom impl. of IQueryCompiler (likely a subclass or decorator of our concrete QueryCompiler class), and perform the interception around the various Execute methods.

[anpete]

Here are the docs for custom service registration: https://docs.efproject.net/en/latest/miscellaneous/internals/services.html