In the development of Anqi CMS templates,repeatThe filter is a concise and practical tool that allows us to quickly duplicate a string multiple times.But many developers may wonder, if the data passed to this filter is not of string type, such as numbers, boolean values, or even more complex objects, will it throw an error?repeatFilter.

repeatThe core function and usage of the filter

repeatThe core function of the filter is very direct: it outputs a string repeatedly according to the specified number of times.When we need to quickly generate repeated content in a template, such as creating separators, generating repeated placeholder text, or simply displaying a keyword repeatedly, it comes in handy.

For example, if you want to repeat the word 'Anqi CMS' five times, just write the template code like this:

{{"安企CMS"|repeat:5}}

页面上便会立即呈现出“EnglishCMSEnglishCMSEnglishCMSEnglishCMSEnglishCMS”。}]This process is efficient and intuitive, fully embodying its original design intention — to simplify the repeated output of strings.

The handling mechanism of non-string type input: will it report an error?

According to the description of the Anqi CMS document,repeatThe filter is specifically designed for processingStringdesigned.This means that the most ideal input type is a string.So, will it directly report an error when it encounters non-string data types?This is not a generalization, the underlying template engine (Pongo2) used by Anqi CMS will have several different behavior patterns when handling different data types.

1. Implicit conversion of simple types:For some simple non-string types, such as numbers or booleans, template engines usually try to perform implicit type conversion. This means that like{{123|repeat:3}}This code, the system is likely to first convert the number123to strings"123"and then execute repeated operations, finally output"123123123"Boolean values are similar, and may be converted to"true"or"false"Perform repetition. In this case, the filter does not report an error, but 'smartly' handles unexpected data types.

2. Complex types andnilpotential issues with values:However, when the input type is an array, an object (such as a structure), a map ornilthe value, the situation becomes complex. Directly passing these complex types torepeatFilter, it may cause template rendering errors or produce unexpected outputs. For example, ifobjis a struct in Go language, its default string representation may not be what you expect (for example, outputing&{字段:值}Such Go language struct text representation), or it may not be effectively repeated, which may trigger runtime errors.nilThe value, although sometimes considered an empty string, may also cause unexpected issues in certain strict contexts.

Conclusion:In simple terms,repeatFilterIt may not always throw an error..For types that can be simply converted to strings, such as numbers and booleans, it usually handles them through implicit conversion.There is a high probability of causing template rendering errors.

Actual operation and precautions: how to safely use in the templaterepeat

To ensure the robustness and predictability of the template, we strongly recommend usingrepeatBefore the filter,Always ensure that the input is a string. If your data source might be a number or another type, you can convert it to a string first to avoid potential issues.

You can usestringformata filter to explicitly convert any type of data to a string and then pass it torepeatFilter:

`twig {# 假设 myNumber 是一个数字变量 #} {% set myNumber = 123 %} {{ myNumber|stringformat:“%v”|repeat:3 }} {# 显式转换为字符串再重复，输出：123123123 #}

{# 假设 myBoolean 是一个布尔变量 #} {% set myBoolean = true %} {{ myBoolean|stringformat:“%v”|repeat:2 }} {# 显式转换为字符串再重复，输出：EnglishEnglish #}

{# Assume myObject is a complex object}