Mapped values can be saved with mapped attributes in Molecule. It’s a special Molecule construct that makes it easy to save for instance multi-lingual data without having to create language-variations of each attribute. But they can also be used for any other key-value indexed data.
Say you want to save famous Persons names in multiple languages. Then you could use a mapString:
// In definition file
val name = mapString
// Insert mapped data
Person.id.name.insert(
1,
Map(
"en" -> "Dmitri Shostakovich",
"de" -> "Dmitri Schostakowitsch",
"fr" -> "Dmitri Chostakovitch",
"es" -> "Dmitri Shostakóvich"
)
)
// Retrieve mapped data
Person.id.name.get.head === (1,
Map(
"en" -> "Dmitri Shostakovich",
"de" -> "Dmitri Schostakowitsch",
"fr" -> "Dmitri Chostakovitch",
"es" -> "Dmitri Shostakóvich"
)
)
Molecule concatenates the key and value of each pair to one of several values of an underlying cardinality-many attribute. When data is then retrieved Molecule splits the concatenated string into a typed pair. This all happens automatically and let’s us focus on their use in our code.
All getters have an asynchronous equivalent. Synchronous getters shown for brevity.
There’s a broad range of ways we can query mapped attributes and you can see a lot of examples of their use in
the attrMap test cases.