On 2/07/2020 17:15, Rob Atkinson wrote:
After some fiddling I can return data from a content tag set
with a query like this
{
clauseSections(where: {rdfs_label: {pattern: "def"}
} ) {
rdfs_label
topic {
label
}
uri
}
}
This successfully returns details from the linked topic.
But I cant get a query to work the restricts the subjects by
properties of the topics. I cant find examples of syntax for:
The fallback for any type of filter is SPARQL:
https://www.topquadrant.com/graphql/graphql-queries.html#sparql
Did you try that?
1) filtering main object on properties of nested objects
Similar to this?
https://www.topquadrant.com/graphql/graphql-queries.html#where
2) filtering if a value is present ( _is_null)
To check for non-existence of a property, you can probably use maxCount 0
{
concepts(where: {
hidden: {
maxCount: 0
}}) {
uri
}
}
3) combining (AND and OR) filters
Use SPARQL for that. GraphQL isn't meant as a complete replacement
without "help" - its benefit is simplicity for the average web developer.
Also, I created property shapes for the subject root class and tagging
property in order to make this work to retrieve details of , but
perhaps there is some way of making this happen (I created and ran
SHACL rules to enforce this.. so its repeatable - but have I
duplicated something?)
Sounds good. The GraphQL engine is based on the presence of SHACL
definitions, so if no such property shapes exist, the engine will not
offer GraphQL fields.
Holger
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