{"record":{"id":"45db10084f0c43d8","repo":"activerecord-hackery/ransack","slug":"don-t-know-how-to-klassify-obj-inspect","errorCode":null,"errorMessage":"Don't know how to klassify #{obj.inspect}","messagePattern":"Don't know how to klassify #(.+?)","errorType":"exception","errorClass":"ArgumentError","httpStatus":null,"severity":"error","filePath":"lib/ransack/context.rb","lineNumber":65,"sourceCode":"      @base = @join_dependency.instance_variable_get(:@join_root)\n    end\n\n    def bind_pair_for(key)\n      @bind_pairs ||= {}\n\n      @bind_pairs[key] ||= begin\n        parent, attr_name = get_parent_and_attribute_name(key.to_s)\n        [parent, attr_name] if parent && attr_name\n      end\n    end\n\n    def klassify(obj)\n      if Class === obj && ::ActiveRecord::Base > obj\n        obj\n      elsif obj.respond_to? :klass\n        obj.klass\n      else\n        raise ArgumentError, \"Don't know how to klassify #{obj.inspect}\"\n      end\n    end\n\n    # Convert a string representing a chain of associations and an attribute\n    # into the attribute itself\n    def contextualize(str)\n      parent, attr_name = bind_pair_for(str)\n      table_for(parent)[attr_name]\n    end\n\n    def chain_scope(scope, args)\n      return unless @klass.method(scope) && args != false\n      @object = if scope_arity(scope) < 1 && args == true\n                  @object.public_send(scope)\n                elsif scope_arity(scope) == 1 && args.is_a?(Array)\n                  # For scopes with arity 1, pass the array as a single argument instead of splatting\n                  @object.public_send(scope, args)\n                else","sourceCodeStart":47,"sourceCodeEnd":83,"githubUrl":"https://github.com/activerecord-hackery/ransack/blob/e82f6bab3956c5597e7debbefa218d9e94e58ceb/lib/ransack/context.rb#L47-L83","documentation":"The base Ransack::Context#klassify (unlike the ActiveRecord adapter version, which also accepts objects responding to base_klass) raises this ArgumentError when given an object that is neither an ActiveRecord::Base subclass nor responds to #klass. It is reached via Context#traverse while resolving an association/attribute path string to a model class during search building.","triggerScenarios":"Ransack resolves a path like 'parent_children_grandchildren_attr' and an intermediate segment resolves to an object without #klass — e.g. a join dependency node from a mismatched Rails version, or a custom object injected into the traversal base. Also reachable by calling context.klassify(obj) directly with a plain object.","commonSituations":"Rails version incompatibilities where JoinDependency internals no longer expose klass on join nodes (the AR adapter's base_klass branch exists precisely for this); custom Ransack adapters; searching associations backed by non-AR classes.","solutions":["Ensure every association in the searched chain is a standard ActiveRecord association pointing at an AR model","If you maintain a custom adapter, implement klassify to handle your join objects (mirror the base_klass fallback the AR adapter has)","Update ransack to a version matching your Rails version — join node internals (klass vs base_klass) shifted across Rails 5.x/6.x/7.x"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"# before calling traverse/klassify paths with a custom base:\ndef klassifiable_base?(obj)\n  (obj.is_a?(Class) && obj < ActiveRecord::Base) || obj.respond_to?(:klass)\nend\n\nraise ArgumentError, \"cannot traverse from #{obj.inspect}\" unless klassifiable_base?(obj)","typeGuard":"def klassifiable?(obj)\n  (obj.is_a?(Class) && obj < ActiveRecord::Base) || obj.respond_to?(:klass)\nend","tryCatchPattern":"begin\n  context.traverse(assoc_path)\nrescue ArgumentError => e\n  Rails.logger.warn(\"Skipping untraversable path #{assoc_path}: #{e.message}\")\n  nil\nend","preventionTips":["Pin the ransack version to one tested against your Rails release — klassify depends on join-node internals (klass vs base_klass)","Keep association chains inside standard ActiveRecord reflections; avoid mixing custom join objects into Ransack contexts","If you subclass Ransack::Context, mirror the ActiveRecord adapter's klassify fallbacks (klass, then base_klass)"],"tags":["ruby","rails","ransack","activerecord","associations","traversal"],"backgroundTag":"unresolvable-model-class","analyzedSha":"e82f6bab3956c5597e7debbefa218d9e94e58ceb","analyzedAt":"2026-08-21T19:30:23.639Z","schemaVersion":2},"datasetVersion":"2026-08-21T23:17:16.201Z"}