用OR来循环for循环 [英] For loop within for loop with OR
问题描述
我想返回我的帖子和我的followed_users帖子。
我有一个名为followed_users的关联,所以我可以给current_user中的朋友打电话@ user.followed_users
<% .followed_users%>
<%for post in friends.posts%>
<%= post.body%>
<%end%>
<%end%>
这只适用于followed_users的帖子。我也想包括我的帖子。所以我的计划是首先检查我的帖子,然后遍历所有看到哪些属于我的followed_users。
我的实现返回我的帖子,但不是所有followed_users
p>我在正确的轨道上吗?
< Post.all%>
<%如果post.user_id == current_user.id ||
为current_user.followed_users中的朋友
为friends.posts中的帖子
结束
结束%>
< li>
<%= post.user.name%>
<%= post.body%>
< / li>
<%end%>
<%end%>
不要,真的不要这样做,不能负责循环所有的对象。
执行此操作:
#in部分,例如_post_details.html.erb
< li>
<%= post.user.name%>
<%= post.body%>
< / li>
在您的主视图中:
<%current_user.followed_users.each do | friend | %GT;
<%=渲染部分:post_details,集合:friend.posts,如::post%>
<%end%>
<%=渲染部分:post_details,集合:current_user.posts,如::post%>
顺便说一句,要小心 N + 1
查询(followers - > posts)。
在您发表评论后,我建议您这样做:
$ b $
ids = current_user.followed_users.map(& id)+ [current_user.id]
@posts = Post.where user_id:ids)
然后在您的视图中:
<%=渲染部分:post_details,集合:@posts,如::post%>
I'm a bit stuck.
I want to return my posts and my followed_users posts.
I have a association called "followed_users" so I am able to call @user.followed_users
<% for friends in current_user.followed_users %>
<% for post in friends.posts %>
<%= post.body %>
<% end %>
<% end %>
This works, however only for "followed_users" posts. I also want to include my posts. So my plan is first check for my post then loop through all to see which belongs to my followed_users.
My implementation is returning my post but not all of followed_users.
Am I on the right track?
<% for post in Post.all %>
<% if post.user_id == current_user.id ||
for friends in current_user.followed_users
for post in friends.posts
end
end %>
<li>
<%= post.user.name %>
<%= post.body %>
</li>
<% end %>
<% end %>
Dont, really don't do this, you cannot afford looping all your objects.
Do this:
#in a partial, say _post_details.html.erb
<li>
<%= post.user.name %>
<%= post.body %>
</li>
In your main view:
<% current_user.followed_users.each do |friend| %>
<%= render partial: "post_details", collection: friend.posts, as: :post %>
<% end %>
<%= render partial: "post_details", collection: current_user.posts, as: :post %>
Btw, beware of the very likely N+1
query (followers -> posts).
After your comment, I suggest you to do:
ids = current_user.followed_users.map(&:id) + [ current_user.id ]
@posts = Post.where(user_id: ids)
Then in your view:
<%= render partial: "post_details", collection: @posts, as: :post %>
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