Constructor dependency injection

_{Beginner → Intermediate. Annotations, explicit targets, collections.}

Annotate a constructor parameter. Melder builds the graph.

class ReportService:
    def __init__(self, database: Database) -> None:   # ← injected
        self.database = database

book.bind(spell=Database, existence="unique")
book.bind(spell=ReportService, existence="unique")
conduit = book.conjure()

report = conduit.meld("ReportService")

Runnable examples

Constructor di by annotation — Intermediate 15
Typed melding — Beginner 16

All beginner examples · Level contents · Full contents

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