Question

我之前曾问过这个相关问题，但没有找到任何帮助Rails 4 - how to use a helper method in an index view

我在这方面有同样的问题。必须有一些东西阻止我在索引操作中使用辅助方法。

我有索引视图和显示视图。帮助程序在show视图中正常工作。

在我的索引视图中，我有：

<% @eois.sort_by(&:created_at).each do |eoi| %>
  <div class="col-md-3 col-sm-5 portfolioitem Scienza">
    <div class="portfolio-item text-center">
      <h4><%= link_to eoi.user.full_name %></h4>
      <span>Interested<%= display_interest(eoi) %></span>
      <%= link_to 'VIEW DETAILS', project_eoi_path(@project, eoi), :class=> "portfolio-item-view" %>
    </div>
  </div>
<% end %>

在我的节目视图中，我有：

<td><%= @eoi.user.full_name %></td>
<td><%= @eoi.user.profile.organisation.try(:title) %></td>  
<td>Interested<%= display_interest(@eoi) %></td>
<td><%= @eoi.created_at.try(:strftime, '%e %B %Y') %></td>

在我的帮助文件中，我有：

def display_interest(eoi)
  if interested_in_contributing
    'in contributing resources to this project team'
  elsif interested_in_participating
    'in participating in this project'
  elsif interested_in_partnering
     'in partnering with this project team'
  elsif interested_in_granting
     'in assessing this project for a grant'
  elsif interested_in_investing
     # elsif eoi.invest || @invest
    'in investing in the outcomes of this project'
  else
     nil
  end
end

# Depending on the type of interest, then figure out which questions need to be asked.

# If the interest is in participation - there is no need to ask questions relating to asset requests
# TODO - need a better way to check the js on participant_intrest to feed through this same channel
def interested_in_participating
  @eoi.participate || @participate
end

# If the interest is in contributing assets or partnering, need to check which assets are relevant to the interest
def interested_in_contributing
  @eoi.contribute || @contribute
end

为什么我不能使用索引视图中的帮助文件？

控制器：

def index
  @eois = Project.by_user_id(current_user.id).find_by(id: params[:project_id]).try(:eois) || Eoi.none
  policy_scope(@eois)
end

def show
  @eoi = Eoi.find(params[:id])
  authorize @eoi
end

Answer 1

试试这个

def display_interest(eoi)
  if interested_in_contributing eoi
    'in contributing resources to this project team'
  .
  .


def interested_in_contributing eoi
  eoi.contribute || @contribute
end

Answer 2

错误显示undefined method contribute on nil class并且正在@eoi上调用此方法，检查您是否在索引操作上定义了@eoi实例变量。它应该看起来像：

def index
  @eoi = 'some value'
end

可能已在您的show操作中定义，但未在index操作中定义。希望它有所帮助。

Answer 3

您应该将变量eoi作为参数传递给interested_in_participating和interested_in_contributing方法。这是因为对于索引操作，实例变量是@eois，而不是@eoi。这是代码段。

def interested_in_participating(eoi)
  eoi.participate || @participate
end

# If the interest is in contributing assets or partnering, need to check which assets are relevant to the interest
def interested_in_contributing(eoi)
  eoi.contribute || @contribute
end

# Add parameter while calling the methods
def display_interest(eoi)
  if interested_in_contributing(eoi)
    'in contributing resources to this project team'
  elsif interested_in_participating(eoi)
    'in participating in this project'
  elsif interested_in_partnering
    'in partnering with this project team'
  elsif interested_in_granting
    'in assessing this project for a grant'
  elsif interested_in_investing
  # elsif eoi.invest || @invest
    'in investing in the outcomes of this project'
  else
    nil
  end
end

如果他们使用@eoi实例，那么其他方法也是如此。

Rails 4 - 如何在索引视图中使用辅助方法？

3 个答案: