遍历模板中具有两个参数的函数时出错 [英] Error when iterating over a function with two arguments in my template

问题描述

视图中有一个函数，可用于在模板中动态构建HTML元素:

I have a function in my view that I use to dynamically build HTML elements in my templates:

defmodule Recursion do
        def buildElements(element,n) when n <= 1 do
            element
        end
        def buildElements(element, n) do
          [element | buildElements(element, n - 1)]
        end
    end

除非我尝试在模板中对其进行迭代，否则它将非常有效:

It is working great unless I try to iterate it in my template:

<%= for element <- MyProject.PageView.Recursion.buildElements("LOL", 2) do %>
            <%= element %>
   <% end %>

我收到此错误:

no function clause matching in Enum."-reduce/3-lists^foldl/2-0-"/3

出什么问题了?

推荐答案

这只是解决您问题的一个小改动.

It's only a small change to solve your problem.

您尝试使用[foo | bar]表示法将元素添加到列表中. bar必须是列表，而foo是单个项目.

You try to add a element to a list with the [foo | bar] notation. bar must be a list while foo is a single item.

将您的element更改为[element]即可.

def buildElements(element,n) when n <= 1 do
  [element]
end

def buildElements(element, n) do
  [element | buildElements(element, n - 1)]
end

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