Hi Luca, thanks for joining us! Can we start with an introduction – what is ArangoDB? We spoke to Luca Olivari, President of ArangoDB, to find out more about their technology and the multi-model approach in general. Many of our customers rely on graph databases to provide the speedy graph querying needed to power their KeyLines deployments.Īnother option is growing in popularity: multi-model databases. Interest in graph-optimized databases has exploded, as developers look for a better way to work with complex and messy real-world data. Property will be populated from the edge.An interview with Luca Olivari of ArangoDBĮarlier this year we welcomed ArangoDB to the Cambridge Intelligence technology alliance. You only traverse the edge leading to this type in an outbound directionįor example the following query will traverse from Owner -> Car via the Ownership edge and as a result the finance.You only access the type via a single type of edge.So the finance property will always be null. So for example if we use the findCar operation we defined earlier - this access the type directly, not via a traversal The limitation of this approach is if we traverse to a Car not using the ownership edge or access it directly the Same property, the target value always takes precedence. In the case of a conflict where an edge and a target have the When we traverse from the Owner -> Car via the ownership edge, the finance property from the ownershipĮdge will be automatically merged into the Car instance. _id: String ! make: String ! model: String ! fuel: String ! finance: String owners: collection: "ownership ", direction: "inbound ") Property of the Owner type to allow us to filter the cars by fuel type. To do that we can add a fuel field to our Car type, toĪllow us to see the fuel attribute of car documents in the Cars collection. Suppose we want to filter the cars an owner has by fuel type. The filters that you can apply are completely controlled by the content of the GraphQL Schema. This library will automatically convert the arguments to FILTER statements in an AQL query to allow for filtering to Replacement for making multiple API fetches. But in GraphQL, every field and nested object can get its own set of arguments, making GraphQL a complete In a system like REST, you can only pass a single set of arguments - the query parameters and URL segments in your But when you add the ability to pass arguments to fields, things get much more interesting. If the only thing we could do was traverse objects and their fields, GraphQL would already be a very useful languageįor data fetching. The ArangoDB GraphQL library allows you to apply filtering on any field in your schema by adding optional arguments to We can represent the properties of the document in each collection on each type, and we can represent the edge byĭeclaring a property and adding the directive to indicate where the edges live that represent that property. In GraphQL schema, we represent the two document collections as types, with a directive to indicate whatĬollection it lives in. In Arango we have created this as an Owner document collection, a Car document collection and an ownership edge Owners andĬars are linked by an edge indicating ownership. Our Graph contains two entities Owners and Cars. Let's walk through a simple example with a simple Graph. In the test resources, there is a Spring profile to match each of the example graphs. Have your connection details in the arangodb section, as shown here. Configure your ArangoDB Connection DetailsĮdit the /src/main/resources/application.yaml file to In ArangoDB - you can create any of the Example Graphs documented here: Mvn install Set up your ArangoDB database To get started you can build the root POM in this directory with Building and Testing Build the Libraries from scratch We also plan to support theĪsync driver in the future. The current implementation uses the sync driver for ArangoDB. We plan to support newer Java versions in the future. RequirementsĬurrently, Java 8 is required. These directives will be used to add metadata to your GraphQL schema to help map your GraphQL types to your underlying Directive collection : String!, direction: String!) on FIELD_DEFINITION directive collection : String!) on OBJECT directive property : String) on INTERFACE | UNION directive name : String) on OBJECT directive on FIELD_DEFINITION
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