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Remove the statement that we can only create constraints on a single property #10

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Remove the statement that we can only create constraints on a single property #10

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5 changes: 3 additions & 2 deletions modeling/guides/02_flight.adoc
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Expand Up @@ -57,8 +57,9 @@ image::{img}/slides.jpg[]

When we refactor the model we want to make sure we only create each flight once.

Neo4j allows us to create unique constraints to ensure uniqueness across a label/property pair, but at the moment we can only create constraints on single properties.
We want to ensure uniqueness across several properties so we'll combine those together into a single dummy property.
Neo4j allows us to create unique constraints to ensure uniqueness across a label/property pair.
As of Neo4j 3.2, node keys are supported- these ensure that all nodes with a particular label have a set of defined properties whose combined value is unique.
However, now we want to ensure uniqueness when merging across several properties so we'll combine those together into a single dummy property.

The combination of airline, flight number, and date makes a flight unique.
As we saw in the previous section, however, some flights can have multiple legs so we'll need to consider departure and arrival airports as well.
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