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我正在使用 Rails 4 制作应用程序。我对表格使用简单的表格。

我正在制作在表单输入上显示略有不同标签的演示者。

我使用它们如下：

在表格中：

<%= f.input :description, :as => :text, :label => " <%= @project_presenter.description %> ", :input_html => {:rows => 10} %>

在演示者中：

class ProjectPresenter

    def initialize(project, profile)
        @project = project
        @profile = user.profile
    end

    def description

        if student?
            "What does the project involve? "
        elsif sponsor?
            "Describe the project. "
        elsif educator?
            "What does the project involve? How will students be involved in the project? "
        elsif researcher?
            "What's involved in the project? Describe the issues to be addressed."
        end
    end

当我尝试这个时，我得到一个指向这一行的语法错误：

<%= f.input :description, :as => :text, :label => " <%= @project_presenter.description %> ", :input_html => {:rows => 10} %>

我认为它不希望演示者周围有 <%= %> 标记。

您如何在表单中使用演示者？

Presenter 定义为：

class ProjectPresenter

    def initialize(project, profile)
        @project = project
        @profile = user.profile
    end

    def description
    ....
    end

用户模型中的关联是：

  has_many :articles
  has_many :authentications, :dependent => :delete_all

  has_many :comments

  belongs_to :organisation
  has_one :profile
  has_many :qualifications
  has_many :identities

  has_many :trl_assessments, as: :addressable

  has_and_belongs_to_many :projects
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1 回答 1

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我对presenter不熟悉，但我能注意到的一件事是你description在Presenter课堂上的方法有一个错误：你没有正确地关闭你的字符串。

def description
  if student?
    "What does the project involve?"
  elsif sponsor?
    "Describe the project." 
  elsif educator?
    "What does the project involve? How will students be involved in the project? "
  elsif researcher?
    "What's involved in the project? Describe the issues to be addressed."
  end
end

而不是你目前拥有的：

def description
  if student?
    "What does the project involve? 
  elsif sponsor?
    "Describe the project. 
  elsif educator?
    "What does the project involve? How will students be involved in the project? "
  elsif researcher?
    "What's involved in the project? Describe the issues to be addressed."
  end
end

另外，在您看来：

<%= f.input :description, :as => :text, :label => " <%= @project_presenter.description %> ", :input_html => {:rows => 10} %>

由于您已经@project_presenter.description在调用erb标签，因此您无需<%= %>在此处指定另一个标签。如果您在这里尝试实现的是字符串插值，那么您所要做的就是将其称为："#{@project_presenter.description}"

<%= f.input :description, :as => :text, :label => "#{@project_presenter.description}", :input_html => {:rows => 10} %>

同时，我认为您应该可以@project_presenter.description直接调用而无需插值，如下所示：

<%= f.input :description, :as => :text, :label => @project_presenter.description, :input_html => {:rows => 10} %>
于 2015-11-22T02:06:24.477 回答