Instance Variable Being Inspected as Class:Method

[45] pry(Subject):1> ls --grep page
Subject.methods:
  after_add_for_pages   after_remove_for_pages   before_add_for_pages   before_remove_for_pages
  after_add_for_pages=  after_remove_for_pages=  before_add_for_pages=  before_remove_for_pages=
  after_add_for_pages?  after_remove_for_pages?  before_add_for_pages?  before_remove_for_pages?
Subject#methods:
  after_add_for_pages      after_remove_for_pages?                before_remove_for_pages
  after_add_for_pages=     autosave_associated_records_for_pages  before_remove_for_pages=
  after_add_for_pages?     before_add_for_pages                   before_remove_for_pages?
  after_remove_for_pages   before_add_for_pages=                  validate_associated_records_for_pages
  after_remove_for_pages=  before_add_for_pages?
instance variables:
  @__callback_runner_name_cache     @column_names                 @generated_feature_methods  @relation
  @arel_engine                      @column_types                 @inheritance_column         @sequence_name
  @arel_table                       @columns                      @parent_name                @serialized_column_names
  @attribute_method_matchers_cache  @columns_hash                 @primary_key                @table_name
  @attribute_methods_generated      @finder_needs_type_condition  @quoted_primary_key         @time_zone_column_names
  @cached_attributes                @generated_attribute_methods  @quoted_table_name
class variables:
  @@configurations    @@disable_implicit_join_references  @@primary_key_prefix_type  @@time_zone_aware_attributes
  @@default_timezone  @@logger                            @@schema_format            @@timestamped_migrations
[46] pry(Subject):1> subject = Subject.find(1)
=> #<Subject id: 1, name: "First Subject", position: 1, visible: true, created_at: "2013-12-27 06:30:05", updated_at: "2013-12-27 21:25:52">
[47] pry(Subject):1> subject.pages.size
=> 1

[50] pry(main)> cd Page
[51] pry(Page):1> ls --grep sections
instance variables:
  @__callback_runner_name_cache     @column_names                 @generated_feature_methods  @relation
  @arel_engine                      @column_types                 @inheritance_column         @sequence_name
  @arel_table                       @columns                      @parent_name                @serialized_column_names
  @attribute_method_matchers_cache  @columns_hash                 @primary_key                @table_name
  @attribute_methods_generated      @finder_needs_type_condition  @quoted_primary_key         @time_zone_column_names
  @cached_attributes                @generated_attribute_methods  @quoted_table_name
class variables:
  @@configurations    @@disable_implicit_join_references  @@primary_key_prefix_type  @@time_zone_aware_attributes
  @@default_timezone  @@logger                            @@schema_format            @@timestamped_migrations

[52] pry(Page):1> page = Page.find(1)
=> #<Page id: 1, subject_id: 1, name: "First Page", permalink: "first", position: 1, visible: false, created_at: "2013-12-27 06:31:10", updated_at: "2013-12-27 06:32:38">
[53] pry(Page):1> page.sections.size
NoMethodError: undefined method `sections' for #<Page:0x000000058c9830>
from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activemodel-4.0.2/lib/active_model/attribute_methods.rb:439:in `method_missing'
[54] pry(Page):1> wtf?