Remove nested operations from GraphQL API

[davimacedo]

No description provided.

[codecov]

Codecov Report

Merging #5931 into master will decrease coverage by 0.04%.
The diff coverage is 87.65%.

@@            Coverage Diff             @@
##           master    #5931      +/-   ##
==========================================
- Coverage   93.73%   93.68%   -0.05%     
==========================================
  Files         156      156              
  Lines       10870    10838      -32     
==========================================
- Hits        10189    10154      -35     
- Misses        681      684       +3

Impacted Files	Coverage Δ
src/GraphQL/loaders/schemaDirectives.js	94.44% <ø> (-0.56%)	⬇️
src/GraphQL/ParseGraphQLServer.js	93.02% <0%> (ø)	⬆️
src/GraphQL/loaders/parseClassQueries.js	97.56% <100%> (ø)	⬆️
src/GraphQL/loaders/objectsMutations.js	97.22% <100%> (-0.28%)	⬇️
src/GraphQL/loaders/defaultGraphQLQueries.js	100% <100%> (ø)	⬆️
src/GraphQL/loaders/usersQueries.js	96.29% <100%> (-0.58%)	⬇️
src/GraphQL/ParseGraphQLSchema.js	96.77% <100%> (-0.68%)	⬇️
src/GraphQL/loaders/objectsQueries.js	97.01% <100%> (-0.17%)	⬇️
src/GraphQL/loaders/functionsMutations.js	100% <100%> (ø)	⬆️
src/GraphQL/loaders/parseClassMutations.js	97.7% <100%> (-1.15%)	⬇️
... and 5 more

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[davimacedo]

I think we should also later improve the callCloudCode to receive from a FunctionEnum, instead of a String. I will add the task in the project.

[Moumouls]

@davimacedo I think above all that we will have to think in the long term about how to integrate cloud function more cleanly (enum is a first step) into the graphql server, or even recommend using custom resolvers instead.

[davimacedo]

In my opinion, I think that the custom resolvers solve the problem of cloud code functions integration to the GraphQL API. The callCloudCode is a convenient method to test something you are still developing though and I wouldn't remove it (as we did with the class generic operations). But I am open to new ideas.