A very common use case is being able to filter using a property. For example:

{
  "query":"{ City_GET(limit:10) {  label(value: "paris") _id  } }"
}

Does hypergraphql provide a mechanism to configure something like this?

Would it be an idea to have another directive that adds this field automatically, like so:

type City @service(id:"dbpedia-sparql") {
    name: String @service(id:"dbpedia-sparql") 
    label: [String] @service(id:"dbpedia-sparql") @filter
}

From @jacobpdq on June 19, 2018 14:45

Hey guys,

This is a great library and I plan to use it with the SOLID framework. Do you have any experience using it with Apollo?

Copied from original issue: semantic-integration/hypergraphql#36

Hi,

Custom scalar types don’t appear to be supported.
Attempting to define ‘scalar anyURI’ results in a null pointer exception in HGQLSchema.getGraphQLOutputType line 305

Not a show stopper as can just use the built-in String, but certainly a nice-to-have

Thanks

From @SkypLabs on May 31, 2018 15:50

Hi,

This issue follows up with #29.

I suggest to add a way to test automatically the building process and, if any, to execute all the unit tests in order to track issues in terms of misconfiguration, dependency problem or regression (see #19).

The pull request #29 suggests using Travis CI to carry out this task. Travis CI is a free, open-source and easy-to-use hosted continuous integration and deployment system. It perfectly fits the needs of an open-source project such as HyperGraphQL.

If you have any questions about Travis CI or the continuous integration and deployment systems in general, I would be happy to answer you.

Thanks.

Copied from original issue: semantic-integration/hypergraphql#32

From @kbrandwijk on January 28, 2018 15:8

I love the idea of this project, but I don't like the fact that it returns a non-standard response (with the @context key). The graphql spec offers a standard way to implement this, using the extensions key.

Copied from original issue: semantic-integration/hypergraphql#23

Pick up system properties for HTTP proxies

I was wondering why the queries (in case of Person type) are called Person_GET & Person_GET_BY_ID and not something like

{
  person(_id: 1) {
    name
  }
}

Hi, Thanks for the awesome repo.

Can you point me to any docs around how to do mutations with this package?

Hi, I'd like to ask the following:

I have this database

 @prefix o: <http://ontology.com/> .
 
 o:Game o:hasName o:Name .
 o:Name o:hasValue "Yu-Gi-Oh!" .

I want to query

{
  Game {
    name
  }
}

to get

...
"data": {
  "Game_GET": [
    {
      "name": "Yu-Gi-Oh!"
    }
  ]
}
...

But now, the schema I have is:

type __Context {
  Game:     _@href(iri: "http://ontology.com/Game")
  Name:     _@href(iri: "http://ontology.com/Name")
  hasName:  _@href(iri: "http://ontology.com/hasName")
  hasValue: _@href(iri: "http://ontology.com/hasValue")
}

type Game @service(id: "ontology") {
  hasName: Name @service(id: "ontology")
}

type Name @service(id: "ontology") {
  hasValue: String @service(id: "ontology")
}

I would have to query

{
  Game {
    hasName {
      hasValue
    }
  }
}

to get

...
"data": {
  "Game_GET": [
    {
      "hasName": {
        "hasValue": "Yu-Gi-Oh!"
      }
    }
  ]
}
...

My question is, how to define the schema.graphql so that it make the first GraphQL query possible? Meaning how to chain "hasName"and "hasValue" so it would be reduced to only "name".

I tried

type __Context {
  Game:     _@href(iri: "http://ontology.com/Game")
  name:     _@href(iri: "http://ontology.com/hasName" / "http://ontology.com/hasValue")
}
type Game @service(id: "ontology") {
  name: String @service(id: "ontology")
}

but no luck.

Thanks for your help

From @yoooooooooooooooooooooooo on October 6, 2018 10:0

Hi, just a general questions about the software. In order to use hypergraphql with a sparql backend, do I have to define my own graphql types/classes? Or can I simply link hypergraphql with the endpoint and it will pick up rdf types/classes automatically?

For example if I have a node of class http://schema.org/Book does hypergraphql recognize this automatically if I query for, say, schema:Book or do I have to create a GraphQL types?

Copied from original issue: semantic-integration/hypergraphql#39

I'm trying to use nested fragments in a query to map onto a SKOS-XL schema, but get a 500 error because a FragmentDefinition cannot be cast onto an OperationDefinition. The query works fine without the fragments.

The query is:

fragment ConceptAttrs on Concept {
  preflabel {
    literalform
  }
  altlabel{
    literalform
  }
}

fragment ConceptRecursive on Concept {
	...ConceptAttrs
  broader {
    ...ConceptAttrs
    broader{
      ...ConceptAttrs
      broader {
        ...ConceptAttrs
        broader {
          ...ConceptAttrs
        }
      }
    }
  }
  narrower {
    ...ConceptAttrs
  }
}

{
  Concept_GET(limit: 1) { 
    _id
    ...ConceptRecursive
  }
}

The error trace is:

2018-11-05 09:11:17 ERROR GeneralError:54 -
java.lang.ClassCastException: graphql.language.FragmentDefinition cannot be cast to graphql.language.OperationDefinition
	at org.hypergraphql.datafetching.ExecutionForestFactory.getExecutionForest(ExecutionForestFactory.java:15)
	at org.hypergraphql.services.HGQLQueryService.results(HGQLQueryService.java:66)
	at org.hypergraphql.Controller.lambda$start$3(Controller.java:117)
	at spark.RouteImpl$1.handle(RouteImpl.java:61)
	at spark.http.matching.Routes.execute(Routes.java:61)
	at spark.http.matching.MatcherFilter.doFilter(MatcherFilter.java:130)
	at spark.embeddedserver.jetty.JettyHandler.doHandle(JettyHandler.java:50)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1568)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
	at org.eclipse.jetty.server.Server.handle(Server.java:561)
	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:334)
	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:104)
	at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:247)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.produce(EatWhatYouKill.java:140)
	at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:131)
	at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:243)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:679)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:597)
	at java.lang.Thread.run(Thread.java:748)

The schema:

type __Context {
    Concept:      _@href(iri: "http://www.w3.org/2004/02/skos/core#Concept")
    Label:        _@href(iri: "http://www.w3.org/2008/05/skos-xl#Label")
    Scheme:       _@href(iri: "http://www.w3.org/2004/02/skos/core#Scheme")
    Collection:   _@href(iri: "http://www.w3.org/2004/02/skos/core#Collection")
    preflabel:    _@href(iri: "http://www.w3.org/2008/05/skos-xl#prefLabel")
    altlabel:     _@href(iri: "http://www.w3.org/2008/05/skos-xl#altLabel")
    literalform:     _@href(iri: "http://www.w3.org/2008/05/skos-xl#literalForm")
    broader:      _@href(iri: "http://www.w3.org/2004/02/skos/core#broader")
    narrower:     _@href(iri: "http://www.w3.org/2004/02/skos/core#narrower")
    inscheme:     _@href(iri: "http://www.w3.org/2004/02/skos/core#inScheme")
    label:        _@href(iri: "http://www.w3.org/2000/01/rdf-schema#")
}

type Concept @service(id:"dkp-sparql") {
    preflabel: [Label!] @service(id:"dkp-sparql")
    altlabel: [Label] @service(id:"dkp-sparql")
    broader: [Concept] @service(id:"dkp-sparql")
    narrower: [Concept] @service(id:"dkp-sparql")
    inscheme: Scheme! @service(id:"dkp-sparql")
}

type Label @service(id:"dkp-sparql") {
    literalform: String! @service(id:"dkp-sparql")
}

type Scheme @service(id:"dkp-sparql") {
    label: String @service(id:"dkp-sparql")
}

type Collection @service(id:"dkp-sparql") {
    label: String @service(id:"dkp-sparql")
}

Hi @pc3356 and others,

I'm interested in incorporating this work into my organization and contributing, but as an outsider, it's hard to tell where hypergraphql is going and whether it's a safe bet. Contributing is difficult because it's unclear what the original developers have in mind.

Some questions to take this forward:

• are there new features planned? What do they look like? What will they do?
• when is the development (by the hypergraphql people or by contributers) planned?
• how can you contribute?
• is there a versioning strategy and release cycle? (website mentions 1.0.3, github is at 1.0.1)

Hello! HyperGraphQL seems to handle URIs as nulls when the field is typed as String or [String]?

A case where you might needs this, is when you have URIs that are only present as object, but never as subject.
Someone's homepage is a concrete example:

ex:Me a schema:Person;
      foaf:homepage <http://me.org> .

In the schema, I could have (although this might also fail):

type __Context {
    Person:                 _@href(iri: "https://schema.org/Person")
    homepage:               _@href(iri: "http://xmlns.com/foaf/0.1/homepage")
}

type Person @service(id:"endpoint") {
    homepage: Homepage @service(id:"endpoint")
}

type Homepage @service(id:"endpoint") {
}

In order to use:

{
  Person {
   homepage {
      _id
    }
  }
}

Or I could have

type Person @service(id:"endpoint") {
    homepage: String @service(id:"endpoint")
}

In order to use:

{
  Person {
    homepage
  }
}

Although option 1 might be more 'correct', I think at least allowing a string representation of the URI is desired behaviour. HypergraphQL seems to return null in case of option 2, which is unexpected and distorts search results.

I am unable to get the federation working, i have posted my issue in stack-overflow here

can someone help me understand if its possible to construct the shape by linking to entities outside in another SPARQL endpoint. and why do I get the following error:

java.util.concurrent.ExecutionException: HttpException: 400 HTTP 400 error making the query:
 Parse error:  SELECT  * WHERE   { VALUES ?x_2 { <http://localhost:7002/resource/CUSTOMERS/11> }     OPTIONAL       { ?x_2    <http://localhost:7002/resource/vocab/CUSTOMERS_SUPPORTREPID>  ?x_2_1 .         ?x_2_1  a                     <http://localhost:7003/resource/vocab/EMPLOYEES>         OPTIONAL           { ?x_2_1  <http://localhost:7003/resource/vocab/EMPLOYEES_FIRSTNAME>  ?x_2_1_1 }       }   }   
Lexical error at line 3, column 11.  Encountered: " " (32), after : "VALUES"
            at java.util.concurrent.FutureTask.report(Unknown Source)
            at java.util.concurrent.FutureTask.get(Unknown Source)
            at org.hypergraphql.datafetching.services.SPARQLEndpointService.iterateFutureResults(SPARQLEndpointService.java:86)
            at org.hypergraphql.datafetching.services.SPARQLEndpointService.executeQuery(SPARQLEndpointService.java:69)
            at org.hypergraphql.datafetching.ExecutionTreeNode.generateTreeModel(ExecutionTreeNode.java:357)
            at org.hypergraphql.datafetching.FetchingExecution.call(FetchingExecution.java:21)
            at org.hypergraphql.datafetching.FetchingExecution.call(FetchingExecution.java:8)]

Hi. I am trying to get a basic example. I am trying to run your example with dbpedia with Country and City. When I query a city using the GraphiQL, I get the city Id but if I try to get the city and country, I get the following error:
Exception while fetching data (/City_GET[0]/country/_id) : class java.util.ArrayList cannot be cast to class org.apache.jena.rdf.model.RDFNode (java.util.ArrayList is in module java.base of loader 'bootstrap'; org.apache.jena.rdf.model.RDFNode is in unnamed module of loader 'app')

I am using the pre-built jar located at: https://www.hypergraphql.org/resources/hypergraphql-3.0.1-exe.jar
My query is:
{ City_GET(limit: 5) { _id _type country { _id _type } } }
Config: https://github.com/hypergraphql/hypergraphql/blob/master/src/test/resources/test_configurations/config1.json
Schema: https://github.com/hypergraphql/hypergraphql/blob/master/src/test/resources/test_configurations/schema1.graphql

Let me know what I am missing.

Can you enable logging of sparql queries that are being send to the endpoints?

Would it be possible to add an option to replace the type __Context {} with an actual context.json that you supply at startup time? Or are there some technical limitations to such approach?

From @yoooooooooooooooooooooooo on October 6, 2018 10:0

Hi, just a general questions about the software. In order to use hypergraphql with a sparql backend, do I have to define my own graphql types/classes? Or can I simply link hypergraphql with the endpoint and it will pick up rdf types/classes automatically?

For example if I have a node of class http://schema.org/Book does hypergraphql recognize this automatically if I query for, say, schema:Book or do I have to create a GraphQL types?

Copied from original issue: semantic-integration/hypergraphql#39

From @yoooooooooooooooooooooooo on October 6, 2018 10:0

Hi, just a general questions about the software. In order to use hypergraphql with a sparql backend, do I have to define my own graphql types/classes? Or can I simply link hypergraphql with the endpoint and it will pick up rdf types/classes automatically?

For example if I have a node of class http://schema.org/Book does hypergraphql recognize this automatically if I query for, say, schema:Book or do I have to create a GraphQL types?

Copied from original issue: semantic-integration/hypergraphql#39

I was looking for the documentation page and noticed that the link in the about section http://hypergraphql.org on the right side, under the About section returns

400 Bad Request
nginx

www.hypergraphql.org works :)

The README.md contains a note about Release v1.1.4, but there are only Release versions 0.1 and 0.2 available. This is confusing.

Hi!

This product looks wonderful! However I wonder if there is a possiblity, already implemented or as an added feature to add property path features of sparql in some way:
https://www.w3.org/TR/sparql11-property-paths/

What I'd really need is inverse properties but I thought that maybe the tool would benefit from all of these.

From what I understand it would mean extending the GraphQL language in some way.

From @jeffreycwitt on January 20, 2018 17:33

Beyond, non null values, can we support queries where fields must have specific values?

I write SPARQL queries like this all time.

SELECT ?x_1 ?title WHERE { 
?x_1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://scta.info/resource/expression> .  
?x_1 <http://scta.info/property/structureType> <http://scta.info/resource/structureItem> .  
?x_1 <http://purl.org/dc/elements/1.1/title> ?title
} 
LIMIT 100 

I expect that I'd like to write my graphQL query where the structureType property has an additional argument

{
  Expression_GET(limit:100)
  {
    structureType(predicate: structureItem) 
    title
    _id
  }
}

Copied from original issue: semantic-integration/hypergraphql#22

When the config or schema needs updating, you have to restart the entire application. Is there a way to make updates while running possible?

Hello
Bravo for that project. I will be very interested for some support of filters.
But for now, I have a problem. I've deployed an hypergraphql server linked to a fuseki rdf dataset.
On http://localhost:8080/graphiql, the query

{
  Takeoff_GET(limit:10) {
    label
    latitude
    longitude
  
     }
}

```give me what I expect.
But using the same query from an ApolloClient, I get the following error in hypergraphql

2021-09-12 16:26:01 WARN SimpleDataFetcherExceptionHandler:26 - Exception while fetching data (/Takeoff_GET) : class graphql.GraphQLContext cannot be cast to class org.hypergraphql.datamodel.ModelContainer (graphql.GraphQLContext and org.hypergraphql.datamodel.ModelContainer are in unnamed module of loader 'app')
java.lang.ClassCastException: class graphql.GraphQLContext cannot be cast to class org.hypergraphql.datamodel.ModelContainer (graphql.GraphQLContext and org.hypergraphql.datamodel.ModelContainer are in unnamed module of loader 'app')
at org.hypergraphql.datamodel.FetcherFactory.lambda$instancesOfTypeFetcher$2(FetcherFactory.java:44)
at graphql.execution.ExecutionStrategy.fetchField(ExecutionStrategy.java:277)
at graphql.execution.ExecutionStrategy.resolveFieldWithInfo(ExecutionStrategy.java:202)
at graphql.execution.AsyncExecutionStrategy.execute(AsyncExecutionStrategy.java:74)
at graphql.execution.Execution.executeOperation(Execution.java:167)
at graphql.execution.Execution.execute(Execution.java:108)
at graphql.GraphQL.execute(GraphQL.java:598)
at graphql.GraphQL.parseValidateAndExecute(GraphQL.java:529)
at graphql.GraphQL.executeAsync(GraphQL.java:493)
at graphql.GraphQL.execute(GraphQL.java:426)
at graphql.GraphQL.execute(GraphQL.java:308)
at org.hypergraphql.services.HGQLQueryService.results(HGQLQueryService.java:58)
at org.hypergraphql.Controller.lambda$start$3(Controller.java:139)
at spark.RouteImpl$1.handle(RouteImpl.java:72)
at spark.http.matching.Routes.execute(Routes.java:61)
at spark.http.matching.MatcherFilter.doFilter(MatcherFilter.java:134)
at spark.embeddedserver.jetty.JettyHandler.doHandle(JettyHandler.java:50)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1584)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127)
at org.eclipse.jetty.server.Server.handle(Server.java:501)
at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383)
at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:556)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375)
at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:272)
at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103)
at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171)
at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129)
at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375)
at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806)
at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938)
at java.base/java.lang.Thread.run(Thread.java:831)

Inspecting the request, I can see the payload

query: "{\n Takeoff_GET(limit: 10) {\n label\n latitude\n longitude\n __typename\n }\n}\n"
variables: {}

ApolloClient seems to add the __typename field, which is not in my submited query. If I try my query with the __typename, I get the same error from graphqli.  For now, I doesn't find how to inhibit ApolloClent from adding __typename or to enable Hypergraphql to manage __typename. 

Any help will be welcome.