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Summary/the error I'm getting this error at different places in my application: ActiveRecord::AssociationTypeMismatch in Settings::CompaniesController#show Company(#70257861502120) expected, got Company(#70257861787700) activerecord (3.2.11) lib/active_record/associations/association.rb:204:in `raise_on_type_mismatch' activerecord (3.2.11) lib/active_record/associations/belongs_to_association.rb:6:in `replace' activerecord (3.2.11) lib/active_record/associations/singular_association.rb:17:in `writer' activerecord (3.2.11) lib/active_record/associations/builder/association.rb:51:in `block in define_writers' activerecord (3.2.11) lib/active_record/attribute_assignment.rb:85:in `block in assign_attributes' activerecord (3.2.11) lib/active_record/attribute_assignment.rb:78:in `each' activerecord (3.2.11) lib/active_record/attribute_assignment.rb:78:in `assign_attributes' activerecord (3.2.11) lib/active_record/base.rb:497:in `initialize' app/controllers/settings/companies_controller.rb:4:in `new' app/controllers/settings/companies_controller.rb:4:in `show' Controller The controller looks like this, but the problem can occur at any point where a Company model is used to save or update another model: class Settings::CompaniesController < SettingsController def show @company = current_user.company @classification = Classification.new(company: @company) end def update end end Facts/observations Some facts and observations: The problem occurs randomly, but usually after the development server has been running for a while. The problem does not occur in production. The problem occurs even when I have made no changes at all to the Company model. The problem is solved by restarting the server. Theories As far as I understand this is due to dynamic loading of classes. Som

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