在Rails 3中使用助手来输出html [英] Using helpers in rails 3 to output html
问题描述
我正在竭尽全力构建一个输出由集合的所有成员组成的<'ul>的助手.对于集合的每个成员,我想打印出一个带有标题的<'li>,以及指向该成员CRUD的链接的div.这与Rails输出的用于索引视图的脚手架非常相似.
这是我所拥有的助手:
def display_all(collection_sym)
collection = collection_sym.to_s.capitalize.singularize.constantize.all
name = collection_sym.to_s.downcase
html = ''
html << "<ul class=\"#{name}-list\">"
for member in collection do
html << content_tag(:li, :id => member.title.gsub(' ', '-').downcase.strip) do
concat content_tag(:h1, member.title, :class => "#{name}-title")
concat link_to 'Edit', "/#{name}/#{member.id}/edit"
concat "\|"
concat link_to 'View', "/#{name}/#{member.id}"
concat "\|"
concat button_to 'Delete', "/#{name}/#{member.id}", :confirm => 'Are you sure? This cannot be undone.', :method => :delete
end
end
html << '</ul>'
return html
end
这正是我想要的输出.首先,如果有人认为有更好的方法可以执行此操作,请随时纠正我,我怀疑我正在以一种低音处理方式执行此操作,但此刻这是我唯一知道的方法.>
然后我尝试将链接包装到div中,如下所示:
def display_all(collection_sym)
collection = collection_sym.to_s.capitalize.singularize.constantize.all
name = collection_sym.to_s.downcase
html = ''
html << "<ul class=\"#{name}-list\">"
for member in collection do
html << content_tag(:li, :id => member.title.gsub(' ', '-').downcase.strip) do
concat content_tag(:h1, member.title, :class => "#{name}-title")
concat content_tag(:div, :class => "links-bar") do
concat link_to 'Edit', "/#{name}/#{member.id}/edit"
concat "\|"
concat link_to 'View', "/#{name}/#{member.id}"
concat "\|"
concat button_to 'Delete', "/#{name}/#{member.id}", :confirm => 'Are you sure? This cannot be undone.', :method => :delete
end
end
end
html << '</ul>'
return html
end
但是,我现在不再在div.links-bar输出到视图中获得任何标记.我确定这一定与块和绑定有关,但是我可以终生弄清楚修复该问题的方法或方法.有人可以提供任何帮助吗?
我同意上面的建议,建议使用部分....但是,如果您DID需要在助手中执行此操作,则这是一种更干净的方法实施:
def display_all(collection)
content_tag(:ul, class: "list") do
collection.collect do |member|
concat(content_tag(:li, id: member.name.gsub(' ', '-').downcase.strip) do
member.name
end)
end
end
end
我会显式传递一个集合,而不是传递一个符号来创建一个集合,因此您不必总是同时显示特定表中的所有记录.您可以添加分页等.
I'm trying my best to build a helper that outputs a <'ul> consisting of all the members of a collection. For each member of the collection I want to print out a <'li> that has a title, and a div of links to CRUD the member. This is pretty similar to what Rails outputs for scaffolding for the index view.
Here is the helper I've got:
def display_all(collection_sym)
collection = collection_sym.to_s.capitalize.singularize.constantize.all
name = collection_sym.to_s.downcase
html = ''
html << "<ul class=\"#{name}-list\">"
for member in collection do
html << content_tag(:li, :id => member.title.gsub(' ', '-').downcase.strip) do
concat content_tag(:h1, member.title, :class => "#{name}-title")
concat link_to 'Edit', "/#{name}/#{member.id}/edit"
concat "\|"
concat link_to 'View', "/#{name}/#{member.id}"
concat "\|"
concat button_to 'Delete', "/#{name}/#{member.id}", :confirm => 'Are you sure? This cannot be undone.', :method => :delete
end
end
html << '</ul>'
return html
end
And that output exactly what I want. First of all, if anybody thinks there's a better way to do this, please feel free to correct me, I suspect that I'm doing this in a bass ackwards way, but at the moment its the only way I know how.
I then attempted to wrap the links in a div as follows:
def display_all(collection_sym)
collection = collection_sym.to_s.capitalize.singularize.constantize.all
name = collection_sym.to_s.downcase
html = ''
html << "<ul class=\"#{name}-list\">"
for member in collection do
html << content_tag(:li, :id => member.title.gsub(' ', '-').downcase.strip) do
concat content_tag(:h1, member.title, :class => "#{name}-title")
concat content_tag(:div, :class => "links-bar") do
concat link_to 'Edit', "/#{name}/#{member.id}/edit"
concat "\|"
concat link_to 'View', "/#{name}/#{member.id}"
concat "\|"
concat button_to 'Delete', "/#{name}/#{member.id}", :confirm => 'Are you sure? This cannot be undone.', :method => :delete
end
end
end
html << '</ul>'
return html
end
However, I now no longer get any of the markup inside the div.links-bar output to the view. I'm sure this must have something to do with block and bindings, but I can for the life of me figure out what or how to go about fixing it. Can anybody offer any help?
I agree with the comment above recommending the use of a partial... but if you DID need to do this in a helper, this is a cleaner way to implement:
def display_all(collection)
content_tag(:ul, class: "list") do
collection.collect do |member|
concat(content_tag(:li, id: member.name.gsub(' ', '-').downcase.strip) do
member.name
end)
end
end
end
I'd pass in a collection explicitly rather than passing in a symbol to create a collection so you aren't always required to display ALL the records in a particular table at once. You could add pagination, etc.
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