ActiveRecord::Fixture::FixtureError: table has no columns named "false" - ruby-on-rails

Question

I am getting the error: ActiveRecord::Fixture::FixtureError: table "creatures" has no columns named "false". I have no column named false in this model.
What is going on?
Here is my fixture:
3 one:
4 name: MyString
5 no: 1
6 type1: 1
7 type2: 1
8 total: 1
9 hp: 1
10 attack: 1
11 defense: 1
12 special_attack: 1
13 special_defense: 1
14 speed: 1
15 generation: 1
16 legendary: false
17

Answer 1

Putting the no in single quotes solved the problem.
If I put a debugger call just before the error is raised:
[475, 484] in /usr/local/bundle/gems/activerecord-7.0.4.2/lib/active_record/connection_adapters/abstract/database_statements.rb
475: fixture = fixture.stringify_keys
476:
477: unknown_columns = fixture.keys - columns.keys
478: if unknown_columns.any?
479: debugger
=> 480: raise Fixture::FixtureError, %(table "#{table_name}" has no columns named #{unknown_columns.map(&:inspect).join(', ')}.)
481: end
482:
483: columns.map do |name, column|
484: if fixture.key?(name)
(byebug) fixtures
It looks like the no got interpreted as a false:
[{"name"=>"MyString", false=>1, "type1"=>1, "type2"=>1, "total"=>1, "hp"=>1, "attack"=>1, "defense"=>1, "special_attack"=>1, "special_defense"=>1, "speed"=>1, "genneration"=>1, "legendary"=>false, "created_at"=>2023-02-05 18:53:31.63881045 UTC, "updated_at"=>2023-02-05 18:53:31.63881045 UTC, "id"=>980190962}, {"name"=>"MyString", false=>2, "type1"=>1, "type2"=>1, "total"=>1, "hp"=>1, "attack"=>1, "defense"=>1, "special_attack"=>1, "special_defense"=>1, "speed"=>1, "genneration"=>1, "legendary"=>false, "created_at"=>2023-02-05 18:53:31.63881045 UTC, "updated_at"=>2023-02-05 18:53:31.63881045 UTC, "id"=>298486374}]
Putting the no in single quotes solved the problem:
3 one:
4 name: MyString
5 'no': 1
6 type1: 1
7 type2: 1
8 total: 1
9 hp: 1
10 attack: 1
11 defense: 1
12 special_attack: 1
13 special_defense: 1
14 speed: 1
15 generation: 1
16 legendary: false
17
18 two:
19 name: MyString
20 'no': 2
21 type1: 1
22 type2: 1
23 total: 1
24 hp: 1
25 attack: 1
26 defense: 1
27 special_attack: 1
28 special_defense: 1
29 speed: 1
30 generation: 1
31 legendary: false