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Restore saved values of an Observe's properties.
map.restore( [deep] )
restore sets the properties of an Observe back to what they were the last time
[can-define-backup.prototype.backup backup] was called. If deep is true,
restore will also restore the properties of nested Observes.
restore will not remove properties that were added since the last backup, but it
will re-add properties that have been removed.
Parameters
- deep
{bool}:whether to restore properties in nested Observes
import DefineMap from "can-define/map/map";
import defineBackup from "can-define-backup";
const recipe = new DefineMap( "Recipe", {
title: "Pancake Mix",
yields: "3 batches",
ingredients: [ {
ingredient: "flour",
quantity: "6 cups"
}, {
ingredient: "baking soda",
quantity: "1 1/2 teaspoons"
}, {
ingredient: "baking powder",
quantity: "3 teaspoons"
}, {
ingredient: "salt",
quantity: "1 tablespoon"
}, {
ingredient: "sugar",
quantity: "2 tablespoons"
} ]
} );
defineBackup(recipe);
recipe.backup();
recipe.title = "Flapjack Mix";
recipe.restore();
recipe.title; // "Pancake Mix"
recipe.ingredients[ 0 ].quantity = "7 cups";
recipe.restore();
recipe.ingredients[ 0 ].quantity; // "7 cups"
recipe.restore( true );
recipe.ingredients[ 0 ].quantity; // "6 cups"