Each.iterator的打印量超出了预期,Ruby on rails 4 [英] Each.iterator prints more than it should, Ruby on rails 4
问题描述
我在html.erb文件中有此文件:
<%= @ pg_search_documents.each | result | %>
<%= simple_format(result.content)%>< br>< br>
<%end%>
输出如下:
nadja kuhn
Zwischen Nadja Dazwischen
[#< PgSearch :: Document id:17,内容: nadja kuhn,searchable_id:122,searchable_type:事件,created_at: 2016-03-18 22:45:02,updated_at: 2016-03-18 22:45:02> ;, < PgSearch ::文档ID:19,内容: Zwischen Nadja Dazwischen,searchable_id:124,searchable_type: Event,created_at: 2016-03-18 22:45:02,updated_at: 2016-03- 18 22:45:02>]
前两行按预期方式打印,但不知何故
如果我这样写:
<%= @pg_search_documents。每个|结果| %>
前两行如预期的那样消失了,但是不知何故仍然是此列表:
[#< PgSearch :: Document id:17,内容: nadja kuhn,searchable_id: 122,searchable_type:事件,created_at: 2016-03-18 22:45:02,update_at: 2016-03-18 22:45:02> ;,#< PgSearch :: Document id:19 ,内容: Zwischen Nadja Dazwischen,searchable_id:124,searchable_type: Event,created_at: 2016-03-18 22:45:02,updated_at: 2016-03-18 22:45:02> ]
如果我什么也没写,那么什么也没发生。我该怎么办,第二个列表不会被打印?
这是因为您要输出的行您的迭代器:
<%= @ pg_search_documents.each |结果| %>
注意多余的 =
to_s
在引擎盖下。
<%@pg_search_documents。每个结果|| %>
请参见这个问题关于 <%...%>
之间的差异和<%= ...%>
。
I have this in my html.erb file:
<%= @pg_search_documents.each do |result| %>
<%= simple_format(result.content) %><br><br>
<% end %>
The output is the following:
nadja kuhn
Zwischen Nadja Dazwischen
[#<PgSearch::Document id: 17, content: "nadja kuhn", searchable_id: 122, searchable_type: "Event", created_at: "2016-03-18 22:45:02", updated_at: "2016-03-18 22:45:02">, #<PgSearch::Document id: 19, content: "Zwischen Nadja Dazwischen", searchable_id: 124, searchable_type: "Event", created_at: "2016-03-18 22:45:02", updated_at: "2016-03-18 22:45:02">]
The first two lines are printed as expected, but somehow, there comes more, than just the content, namely, the list with the whole entries.
If I write this:
<%= @pg_search_documents.each do |result| %>
The first two lines disappear, as expected, but somehow, there is still this list:
[#<PgSearch::Document id: 17, content: "nadja kuhn", searchable_id: 122, searchable_type: "Event", created_at: "2016-03-18 22:45:02", updated_at: "2016-03-18 22:45:02">, #<PgSearch::Document id: 19, content: "Zwischen Nadja Dazwischen", searchable_id: 124, searchable_type: "Event", created_at: "2016-03-18 22:45:02", updated_at: "2016-03-18 22:45:02">]
If I write nothing, then nothing happens. What do I need to do, that this second list doesn't get printed?
That's because you are outputing the line of your iterator:
<%= @pg_search_documents.each do |result| %>
Notice the extra =
, which essentially calls to_s
under the hood. Take it out.
<% @pg_search_documents.each do |result| %>
See this question on the difference between <% ... %>
and <%= ... %>
.
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