Support MappedSuperclass for JPA entity attributes

[miklemv]

Fix mapping for entity class attributes declared in @MappedSuperclass base entity

[codecov]

Codecov Report

Merging #113 into master will decrease coverage by 0.52%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #113      +/-   ##
============================================
- Coverage     66.35%   65.82%   -0.53%     
+ Complexity      379      370       -9     
============================================
  Files            34       37       +3     
  Lines          2030     2025       -5     
  Branches        302      299       -3     
============================================
- Hits           1347     1333      -14     
- Misses          552      562      +10     
+ Partials        131      130       -1

Impacted Files	Coverage Δ	Complexity Δ
...jpa/query/schema/impl/GraphQLJpaSchemaBuilder.java	86.66% <100%> (-0.61%)	105 <2> (-8)
...ventures/graphql/jpa/query/schema/JavaScalars.java	32.9% <0%> (-3.42%)	3% <0%> (-1%)
...a/query/schema/impl/QraphQLJpaBaseDataFetcher.java	71.91% <0%> (-0.86%)	113% <0%> (-2%)
...hql/jpa/query/schema/impl/JpaPredicateBuilder.java	46.11% <0%> (-0.52%)	41% <0%> (-1%)
...graphql/jpa/query/schema/impl/PredicateFilter.java	96.87% <0%> (-0.1%)	4% <0%> (ø)
.../example/starwars/StarwarsSchemaConfiguration.java	100% <0%> (ø)	4% <0%> (ø)	⬇️
.../query/example/books/BooksSchemaConfiguration.java	100% <0%> (ø)	4% <0%> (ø)	⬇️
...jpa/query/schema/model/starwars/DroidFunction.java
...ures/graphql/jpa/query/schema/model/book/Book.java
... and 24 more

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[igdianov]

@miklemv Can you please provide the explanation in the PR description what problem your PR solves?

The @MappedSuperClass is already supported here:

graphql-jpa-query/graphql-jpa-query-schema/src/test/java/com/introproventures/graphql/jpa/query/schema/model/embedded/Vehicle.java

Line 8 in 1955ab6

@MappedSuperclass

[miklemv]

Ок. Don't work
@manytoone(fetch= FetchType.LAZY)
SuperAuthor author;
in base class.
An exception was made when building a schema.

i fix build scheme.
https://codecov.io/gh/introproventures/graphql-jpa-query/pull/113/diff?src=pr&el=tree#D7-583

Test entity
https://github.com/miklemv/graphql-jpa-query/blob/superclass/graphql-jpa-query-schema/src/test/java/com/introproventures/graphql/jpa/query/schema/model/book_superclass/BaseBook.java

[igdianov]

Merged via #120