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ExtJS6系、7系でExtJS3系のReader定義を使う

Last updated at Posted at 2020-03-18

ExtJS 3.4 で使っていた Ext.data.Record の定義を ExtJS 6, 7 でそのまま使いたいとき。
もしくは横着したい人向け。

Ext.override(Ext.data.XmlReader, {
	constructor: function(config) {
		if(!config.model && config.fields) {
			config.model = 'Model-' + Ext.id();
			Ext.define(config.model, {
				extend: 'Ext.data.Model',
				fields: config.fields
			});
		}

		Ext.data.XmlReader.superclass.constructor.apply(this, arguments);
	}
});

Overrideした後は、XmlReader 使うときにこんな感じで定義する。

new Ext.data.XmlReader({
	record: 'data',
	rootProperty: 'data',
	fields: [
		{ name: 'RESULT' },
		{ name: 'ID' }
	]
});

モデル定義が無意味になるという点においては、負荷軽減とかコーディングコストとかその辺りからみると全く無意味なので、その辺も要注意。

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