feat(array): support max and min in array check (#22)

Author: Tomo Wang

README.md

@@ -157,10 +157,12 @@ If type is `object`, there has one addition rule:
 
 #### array
 
-If type is `array`, there has tow addition rule:
+If type is `array`, there has four addition rule:
 
 - `itemType` - The type of every item in this array.
 - `rule` - An object that validate the items of the array. Only work with `itemType`.
+- `max` - The maximun length of the array.
+- `min` - The minimun lenght of the array.
 
 #### abbr
 

index.js

@@ -461,6 +461,13 @@ function checkArray(rule, value) {
     return this.t('should be an array');
   }
 
+  if (rule.hasOwnProperty('max') && value.length > rule.max) {
+    return this.t('length should smaller than %s', rule.max);
+  }
+  if (rule.hasOwnProperty('min') && value.length < rule.min) {
+    return this.t('length should bigger than %s', rule.min);
+  }
+
   if (!rule.itemType) {
     return;
   }

test/index.test.js

@@ -543,6 +543,18 @@ describe('parameter', function () {
        }).should.throw('rule type must be one of number, int, integer, string, id, date, dateTime, datetime, boolean, bool, array, object, enum, email, password, url, but the following type was passed: invalid');
     });
 
+    it('should check max error', function () {
+      var value = {array: [0, 1, 2, 3, 4]};
+      var rule = {array: {type: 'array', itemType: 'int', max: 4, min: 1}};
+      parameter.validate(rule, value)[0].message.should.equal('length should smaller than 4');
+    });
+
+    it('should check min error', function () {
+      var value = {array: [0, 1, 2, 3, 4]};
+      var rule = {array: {type: 'array', itemType: 'int', max: 100, min: 10}};
+      parameter.validate(rule, value)[0].message.should.equal('length should bigger than 10');
+    });
+
     it('should check itemType=object error', function () {
       var value = {
         array: [{