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Comments on Error undefined method `has_tags' or `id' for nil:NilClass during rails db:seed

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Error undefined method `has_tags' or `id' for nil:NilClass during rails db:seed Question

+1
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When running rails db:seed I get some errors without any further explanation.

CloseReason: Created 0, skipped 5
User: Created 0, skipped 1
PostFlagType: Created 0, skipped 4
PostType: Created 0, skipped 5
ReactionType: Created 0, skipped 3
SiteSetting: Created 0, skipped 57
Got error undefined method `has_tags' for nil:NilClass. Continuing...
Ability: Created 0, skipped 7
PostHistoryType: Created 0, skipped 12
Got error undefined method `id' for nil:NilClass. Continuing...
WarningTemplate: Created 0, skipped 3
TagSet: Created 0, skipped 2
License: Created 0, skipped 5

Are they critical? Should I do something?


I tried to setup QPixel again and while I could avoid another error, this one persists. I gathered more information by adding to the rescue clause of db/seeds.rb

puts "#{e.class}: #{e.message}"
puts e.backtrace.join("\n")

and got

Post
Got error undefined method `has_tags' for nil:NilClass. Continuing...
NoMethodError: undefined method `has_tags' for nil:NilClass
/home/abanta/qpixel/app/models/post.rb:52:in `block in <class:Post>'
...
/home/abanta/qpixel/db/seeds.rb:56:in `block (2 levels) in <top (required)>'
/home/abanta/qpixel/db/seeds.rb:21:in `each'
/home/abanta/qpixel/db/seeds.rb:21:in `block in <top (required)>'
/home/abanta/qpixel/db/seeds.rb:11:in `each'
/home/abanta/qpixel/db/seeds.rb:11:in `<top (required)>'

Category
Got error undefined method `id' for nil:NilClass. Continuing...
NoMethodError: undefined method `id' for nil:NilClass
(erb):4:in `block in <top (required)>'
/usr/lib/ruby/2.7.0/erb.rb:905:in `eval'
/usr/lib/ruby/2.7.0/erb.rb:905:in `result'
/home/abanta/qpixel/db/seeds.rb:16:in `block in <top (required)>'
/home/abanta/qpixel/db/seeds.rb:11:in `each'
/home/abanta/qpixel/db/seeds.rb:11:in `<top (required)>'

In the database SELECT * FROM post_types delivers

+----+-----------+-------------+-------------+-----------+----------+------------+--------------+-------------+--------------------+--------------+--------------+--------------------+-----------+----------------+---------------+-----------------------------+
| id | name      | description | has_answers | has_votes | has_tags | has_parent | has_category | has_license | is_public_editable | is_closeable | is_top_level | is_freely_editable | icon_name | answer_type_id | has_reactions | has_only_specific_reactions |
+----+-----------+-------------+-------------+-----------+----------+------------+--------------+-------------+--------------------+--------------+--------------+--------------------+-----------+----------------+---------------+-----------------------------+
|  1 | Answer    | NULL        |           0 |         1 |        0 |          1 |            1 |           1 |                  1 |            0 |            0 |                  0 | NULL      |           NULL |             1 |                           0 |
|  2 | PolicyDoc | NULL        |           0 |         0 |        0 |          0 |            0 |           0 |                  0 |            0 |            0 |                  0 | NULL      |           NULL |             0 |                           0 |
|  3 | HelpDoc   | NULL        |           0 |         0 |        0 |          0 |            0 |           0 |                  0 |            0 |            0 |                  0 | NULL      |           NULL |             0 |                           0 |
|  4 | Article   | NULL        |           0 |         1 |        1 |          0 |            1 |           1 |                  1 |            0 |            1 |                  0 | NULL      |           NULL |             0 |                           0 |
+----+-----------+-------------+-------------+-----------+----------+------------+--------------+-------------+--------------------+--------------+--------------+--------------------+-----------+----------------+---------------+-----------------------------+

Maybe that helps finding the cause and judging the severity of the issue.

I found a issue on Github from August 21 that is related to seeding, but contains only little information at the moment.

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2 comment threads

I'm having this issue too (1 comment)
Honestly, it sounds like there's something wrong with your setup somewhere - maybe a missed step, may... (7 comments)
I'm having this issue too
Monica Cellio‭ wrote over 2 years ago

I got errors (different ones) when seeding the database, and when I queried post_types I got the same four rows you did (question is missing). I got these:

$ rails db:seed
Got error undefined method id' for nil:NilClass. Continuing...
TagSet: Created 2, skipped 0
PostType: Created 4, skipped 1
CloseReason: Created 5, skipped 0
Got error undefined method initial_revision' for #<Class:0x0000000124697178>. Continuing...
PostFlagType: Created 4, skipped 0
Got error undefined method `host' for nil:NilClass. Continuing...
License: Created 5, skipped 0
WarningTemplate: Created 3, skipped 0
ReactionType: Created 3, skipped 0
Ability: Created 7, skipped 0
SiteSetting: Created 57, skipped 0
PostHistoryType: Created 12, skipped 0