Alias cycle
This warning category is spelled c{[alias-cycle]} by qmllint.
Alias property is part of an alias cycle
What happened?
A property alias resolves to itself or to another alias resolving to itself.
Usually, a property alias should reference another property either directly, or indirectly by passing through another alias property.
If a property alias directly or indirectly references itself, then it forms an alias cycle. The warning indicates that the current alias property is inside or references an alias cycle, see Example.
Why is this bad?
Instances of components with alias cycles will not be created at runtime: they will be null instead.
Example
import QtQuick Item { id: someId property alias myself: someId.myself // not ok: referring to itself property alias cycle: someId.cycle2 // not ok: indirectly referring to itself property alias cycle2: someId.cycle property alias indirect: someId.cycle // not ok: referring to alias indirectly referring to itself }
To fix this warning, break up the alias cycles:
import QtQuick Item { id: someId Item { id: anotherId property string myself property int cycle } property alias myself: anotherId.myself // ok: referring to a property property alias cycle: someId.cycle2 // ok: does not refer to itself anymore property alias cycle2: anotherId.cycle // ok: not a cycle anymore property alias indirect: someId.cycle // ok: cycle does not form an alias cycle anymore }
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