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Fix for 10508. Create Association Entity automatically by convention. #21484

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merged 1 commit into from
Jul 8, 2020
Merged

Fix for 10508. Create Association Entity automatically by convention. #21484

merged 1 commit into from
Jul 8, 2020

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lajones
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@lajones lajones commented Jul 1, 2020

Fixes #10508

Create Association Entity automatically by convention. Note: this is only the model building part - also need #19003 for the ChangeTracking part.

@lajones lajones changed the title Fix for 10508 Fix for 10508. Create Association Entity automatically by convention. Jul 1, 2020
@lajones lajones requested a review from AndriySvyryd July 1, 2020 17:07
@lajones lajones self-assigned this Jul 1, 2020
@lajones lajones mentioned this pull request Jul 1, 2020
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@smitpatel smitpatel closed this Jul 1, 2020
@smitpatel smitpatel reopened this Jul 1, 2020
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@lajones - It passed CLA check now. Probably intermittent error in the server.

AndriySvyryd
AndriySvyryd reviewed Jul 1, 2020
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src/EFCore/Metadata/Conventions/ManyToManyConvention.cs Outdated
// do not create an automatic many-to-many association entity type
// for a self-referencing skip navigation, or for one that
// is already "in use" (i.e. has its Foreign Key assigned).
return;
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Why not doing it for self-ref?

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If I have 2 collection navigations pointing to an Entity Type from that same Entity Type, my expectation would be two 1:N navigations to self rather than one N:N. I guess I thought that it was ambiguous, and in ambiguous cases we do nothing and let the user decide.

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We should discuss with the team

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Any m2m navigation pair is potentially 2 different 1:N relationships.

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Agree we should discuss with the team.

AndriySvyryd
AndriySvyryd reviewed Jul 2, 2020
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src/EFCore/Metadata/Internal/InternalModelBuilder.cs Outdated
@@ -211,6 +212,191 @@ public InternalModelBuilder([NotNull] Model metadata)
return entityTypeWithDefiningNavigation?.Builder;
}

private const string AssociationEntityTypeNameTemplate = "Join_{0}_{1}";
private const string AssociationPropertyNameTemplate = "{0}_{1}";
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We should discuss both of these with the team

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Sure.

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What was the team decision WRT to FK property naming?

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See #21565 and #21567

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@AndriySvyryd Is there any reason we need special rules for FKs? We decided in the design meeting to just use the current rules.

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No. That would be my preference as well.

@lajones
Create Join Entity automatically by RelationshipDiscoveryConvention a…
61f6cb9 
…t convention-time and through HasMany().WithMany() for fluent API.
@lajones lajones merged commit 5515d7e into master Jul 8, 2020
@lajones lajones deleted the 20200630_Issue10508_15 branch July 8, 2020 02:39
@ajcvickers ajcvickers mentioned this pull request Jul 9, 2020
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@AndriySvyryd AndriySvyryd AndriySvyryd approved these changes

@smitpatel smitpatel smitpatel left review comments

@ajcvickers ajcvickers ajcvickers left review comments

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Implement many-to-many relationships without mapping join table
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@lajones @smitpatel @ajcvickers @AndriySvyryd