Fix for single column tables (#23)

CHANGELOG.md

@@ -67,6 +67,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+ - Error when dumping single-column tables. [@lsantobuono]
  - Bug with null foreign key to back to auxiliary `has_one` association with not matching names. E.g. user has many profiles and has one default profile, profile belongs to user.
  - Ignored columns handling.
  - Dump relations for records that were dumped earlier with relations excluded.
@@ -136,3 +137,4 @@ Initial release. [@palkan], [@Envek]
 [@cmer]: https://github.com/cmer "Carl Mercier"
 [@nhocki]: https://github.com/nhocki "Nicolás Hock-Isaza"
 [@gazay]: https://github.com/gazay "Alex Gaziev"
+[@lsantobuono]: https://github.com/lsantobuono ""

lib/evil_seed/relation_dumper.rb

@@ -169,7 +169,7 @@ def dump_has_many_associations!
     # @return [Array<Hash{String => String, Integer, Float, Boolean, nil}>]
     def fetch_attributes(relation)
       relation.pluck(*model_class.column_names).map do |row|
-        Hash[model_class.column_names.zip(row)]
+        Hash[model_class.column_names.zip(Array(row))]
       end
     end
 

test/db/models.rb

@@ -70,3 +70,6 @@ class Reaction < ActiveRecord::Base
   belongs_to :votable, polymorphic: true
   belongs_to :user
 end
+
+class Version < ActiveRecord::Base
+end

test/db/schema.rb

@@ -72,5 +72,7 @@ def create_schema!
       t.references :role, foreign_key: { on_delete: :cascade }
       t.index %i[user_id role_id], unique: true
     end
+
+    create_table :versions
   end
 end

test/db/seeds.rb

@@ -64,3 +64,8 @@
   { user: users[1], default: true,  name: "Profile for user 1", title: "Title for user 1" },
   { user: users[2], default: true,  name: "Profile for user 2", title: "Title for user 2" },
 ])
+
+Version.create!([
+  { id: 1},
+  { id: 2},
+])

test/evil_seed_test.rb

@@ -19,6 +19,7 @@ def setup
       config.root('Role') do |root|
         root.exclude(/\Arole\.(?!roles_users\z)/) # Take only join table and nothing more
       end
+      config.root('Version')
 
       config.ignore_columns("Profile", :name)
     end