lib/loader.js
function (Schema, fieldName, parent) {
		var schema = new Schema();
		var name = fieldName.replace(this.KEY_FIELD_REG_EXP, this._patchFormat(schema));

		return parent.field(name).like(schema);
	}
function (Schema, fieldName, parent) {
		var schema = new Schema();
		var name = fieldName.replace(this.KEY_FIELD_REG_EXP, this._patchFormat(schema));

		return parent.field(name).like(schema);
	}
function ( Schema , fieldName , parent ) { var schema = new Schema ( ) ; var name = fieldName . replace ( this . KEY_FIELD_REG_EXP , this . _patchFormat ( schema ) ) ; return parent . field ( name ) . like ( schema ) ; }
parse fieldKey to field schema.
add field schema to parent schema

@method
@private
@param {String#constructor} Schema
@param {String} fieldName
@param {Schema} parent
@returns {Schema} child field schema
parse fieldKey to field schema . add field schema to parent schema