Databases
StackOverflow2013
Postsdbo
POEager loading Rails 3 ActiveRecord Model with conditions on the base table
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POEager loading Rails 3 ActiveRecord Model with conditions on the base table
    primarykey
    data
    text
    <p>I'm trying to get this result: All Posts that are published AND have a specific tag, and include the tags (to avoid n+1)</p> <p>Here is my code:</p> <pre><code>@posts = Post.includes( :tags ).where( :status =&gt; 'published', :tags =&gt; { :name =&gt; params[:tag_name] } ).order( 'published_at DESC' ) </code></pre> <p>Here is the rails s output:</p> <p><code>Parameters: {"tag_name"=&gt;"family"} Post Load (1.1ms) SELECT "posts"."id" AS t0_r0, "posts"."title" AS t0_r1, "posts"."body" AS t0_r2, "posts"."published_at" AS t0_r3, "posts"."excerpt" AS t0_r4, "posts"."slug" AS t0_r5, "posts"."created_at" AS t0_r6, "posts"."updated_at" AS t0_r7, "posts"."status" AS t0_r8, "tags"."id" AS t1_r0, "tags"."name" AS t1_r1, "tags"."created_at" AS t1_r2, "tags"."updated_at" AS t1_r3 FROM "posts" LEFT OUTER JOIN "posts_tags" ON "posts_tags"."post_id" = "posts"."id" LEFT OUTER JOIN "tags" ON "tags"."id" = "posts_tags"."tag_id" WHERE "posts"."status" = 'published' AND "tags"."name" = 'family' ORDER BY published_at DESC Completed in 102ms</code></p> <p>Here is the error message:</p> <pre><code>/home/sam/.rvm/gems/ruby-1.8.7-p334@global/gems/activerecord-3.0.6/lib/active_record/attribute_methods.rb:44:in `eval': missing attribute: status </code></pre> <p>I can see from the SQL that the <code>posts.status</code> column is aliased to <code>t0_r8</code>, but how can I get it to properly respect my condition?</p> <p><strong>EDIT</strong> query that I had, that does work:</p> <pre><code>@posts = Post.joins( :tags ).where( "posts.status = ? AND tags.name = ?", "published", params[:tag_name] ).order( "published_at DESC" ) </code></pre>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USsamandmoore
    1. USsamandmoore
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload