fix(graphql)

[bgdnp]

Fixed auto generated schema on serverless

PR Checklist

Please check if your PR fulfills the following requirements:

• [*] The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[*] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?

Currently nest doesn't work with 'code first' graphql approach on serverless platform. It fails with this output

[Nest] 4650   - 08/02/2019, 11:27 PM   [NestFactory] Starting Nest application... +610988ms
[Nest] 4650   - 08/02/2019, 11:27 PM   [InstanceLoader] AppModule dependencies initialized +7ms
[Nest] 4650   - 08/02/2019, 11:27 PM   [InstanceLoader] ConfigModule dependencies initialized +0ms
[Nest] 4650   - 08/02/2019, 11:27 PM   [InstanceLoader] ResolversModule dependencies initialized +1ms
[Nest] 4650   - 08/02/2019, 11:27 PM   [InstanceLoader] UserModule dependencies initialized +0ms
[Nest] 4650   - 08/02/2019, 11:27 PM   [InstanceLoader] GraphQLModule dependencies initialized +1ms
Serverless: Failure: Schema must contain uniquely named types but contains multiple types named "User".

Issue is described here

Issue Number: N/A

What is the new behavior?

Assigning autoGeneratedSchema to a class property instead of variable seems to fix the problem on serverless. Behavior without serverless is unchanged.

Does this PR introduce a breaking change?

[ ] Yes
[*] No

Other information

[lock]

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