Namespace

Module

Methods

Class Public methods

immutable_strings_by_default=(bool)

Determines whether columns should infer their type as :string or :immutable_string. This setting does not affect the behavior of attribute :foo, :string. Defaults to false.

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implicit_order_column

The name of the column records are ordered by if no explicit order clause is used during an ordered finder call. If not set the primary key is used.

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implicit_order_column=(column_name)

Sets the column to sort records by when no explicit order clause is used during an ordered finder call. Useful when the primary key is not an auto-incrementing integer, for example when it’s a UUID. Records are subsorted by the primary key if it exists to ensure deterministic results.

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inheritance_column

The name of the table column which stores the class name on single-table inheritance situations.

The default inheritance column name is type, which means it’s a reserved word inside Active Record. To be able to use single-table inheritance with another column name, or to use the column type in your own model for something else, you can set inheritance_column:

self.inheritance_column = 'zoink'
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inheritance_column=(column)

Defines the name of the table column which will store the class name on single-table inheritance situations.

📝 Source code 
# File activerecord/lib/active_record/model_schema.rb, line 157
    included do
      class_attribute :primary_key_prefix_type, instance_writer: false
      class_attribute :table_name_prefix, instance_writer: false, default: ""
      class_attribute :table_name_suffix, instance_writer: false, default: ""
      class_attribute :schema_migrations_table_name, instance_accessor: false, default: "schema_migrations"
      class_attribute :internal_metadata_table_name, instance_accessor: false, default: "ar_internal_metadata"
      class_attribute :pluralize_table_names, instance_writer: false, default: true
      class_attribute :implicit_order_column, instance_accessor: false
      class_attribute :immutable_strings_by_default, instance_accessor: false

      class_attribute :inheritance_column, instance_accessor: false, default: "type"
      singleton_class.class_eval do
        alias_method :_inheritance_column=, :inheritance_column=
        private :_inheritance_column=
        alias_method :inheritance_column=, :real_inheritance_column=
      end

      self.protected_environments = ["production"]

      self.ignored_columns = [].freeze

      delegate :type_for_attribute, :column_for_attribute, to: :class

      initialize_load_schema_monitor
    end
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internal_metadata_table_name

The name of the internal metadata table. By default, the value is "ar_internal_metadata".

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internal_metadata_table_name=(table_name)

Sets the name of the internal metadata table.

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pluralize_table_names

Indicates whether table names should be the pluralized versions of the corresponding class names. If true, the default table name for a Product class will be “products”. If false, it would just be “product”. See table_name for the full rules on table/class naming. This is true, by default.

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pluralize_table_names=(value)

Set whether table names should be the pluralized versions of the corresponding class names. If true, the default table name for a Product class will be “products”. If false, it would just be “product”. See table_name for the full rules on table/class naming. This is true, by default.

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primary_key_prefix_type

The prefix type that will be prepended to every primary key column name. The options are :table_name and :table_name_with_underscore. If the first is specified, the Product class will look for “productid” instead of “id” as the primary column. If the latter is specified, the Product class will look for “product_id” instead of “id”. Remember that this is a global setting for all Active Records.

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primary_key_prefix_type=(prefix_type)

Sets the prefix type that will be prepended to every primary key column name. The options are :table_name and :table_name_with_underscore. If the first is specified, the Product class will look for “productid” instead of “id” as the primary column. If the latter is specified, the Product class will look for “product_id” instead of “id”. Remember that this is a global setting for all Active Records.

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schema_migrations_table_name

The name of the schema migrations table. By default, the value is "schema_migrations".

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schema_migrations_table_name=(table_name)

Sets the name of the schema migrations table.

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table_name_prefix

The prefix string to prepend to every table name.

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table_name_prefix=(prefix)

Sets the prefix string to prepend to every table name. So if set to “basecamp_”, all table names will be named like “basecamp_projects”, “basecamp_people”, etc. This is a convenient way of creating a namespace for tables in a shared database. By default, the prefix is the empty string.

If you are organising your models within modules you can add a prefix to the models within a namespace by defining a singleton method in the parent module called table_name_prefix which returns your chosen prefix.

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table_name_suffix

The suffix string to append to every table name.

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table_name_suffix=(suffix)

Works like table_name_prefix=, but appends instead of prepends (set to “_basecamp” gives “projects_basecamp”, “people_basecamp”). By default, the suffix is the empty string.

If you are organising your models within modules, you can add a suffix to the models within a namespace by defining a singleton method in the parent module called table_name_suffix which returns your chosen suffix.

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Instance Public methods

id_value

Returns the underlying column value for a column named “id”. Useful when defining a composite primary key including an “id” column so that the value is readable.

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