Fix for single column tables

lib/evil_seed/relation_dumper.rb

@@ -148,6 +148,7 @@ 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|
+        row = [row] if model_class.column_names.size == 1
         Hash[model_class.column_names.zip(row)]
       end
     end

test/db/models.rb

@@ -61,3 +61,6 @@ class Vote < ActiveRecord::Base
   belongs_to :votable, polymorphic: true
   belongs_to :user
 end
+
+class Version < ActiveRecord::Base
+end

test/db/schema.rb

@@ -64,5 +64,7 @@ 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

@@ -59,3 +59,8 @@
   { user: users[1], name: "Profile for user 1", title: "Title for user 1" },
   { user: users[2], name: "Profile for user 2", title: "Title for user 2" },
 ])
+
+Version.create!([
+  { id: 1},
+  { id: 2},
+])

test/evil_seed_test.rb

@@ -17,6 +17,7 @@ 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