ActiveRecord::Core

configurations()

Returns fully resolved configurations hash

📝 Source code

# File activerecord/lib/active_record/core.rb, line 59
      def self.configurations
        @@configurations
      end

🔎 See on GitHub

configurations=(config)

Contains the database configuration - as is typically stored in config/database.yml - as a Hash.

For example, the following database.yml…

development:
  adapter: sqlite3
  database: db/development.sqlite3

production:
  adapter: sqlite3
  database: db/production.sqlite3

…would result in ActiveRecord::Base.configurations to look like this:

{
   'development' => {
      'adapter'  => 'sqlite3',
      'database' => 'db/development.sqlite3'
   },
   'production' => {
      'adapter'  => 'sqlite3',
      'database' => 'db/production.sqlite3'
   }
}

📝 Source code

# File activerecord/lib/active_record/core.rb, line 53
      def self.configurations=(config)
        @@configurations = ActiveRecord::ConnectionHandling::MergeAndResolveDefaultUrlConfig.new(config).resolve
      end

🔎 See on GitHub

connection_handler()

📝 Source code

# File activerecord/lib/active_record/core.rb, line 130
      def self.connection_handler
        ActiveRecord::RuntimeRegistry.connection_handler || default_connection_handler
      end

🔎 See on GitHub

connection_handler=(handler)

📝 Source code

# File activerecord/lib/active_record/core.rb, line 134
      def self.connection_handler=(handler)
        ActiveRecord::RuntimeRegistry.connection_handler = handler
      end

🔎 See on GitHub

new(attributes = nil)

New objects can be instantiated as either empty (pass no construction parameter) or pre-set with attributes but not yet saved (pass a hash with key names matching the associated table column names). In both instances, valid attribute keys are determined by the column names of the associated table – hence you can't have attributes that aren't part of the table columns.

Example:

# Instantiates a single new object
User.new(first_name: 'Jamie')

📝 Source code

# File activerecord/lib/active_record/core.rb, line 308
    def initialize(attributes = nil)
      self.class.define_attribute_methods
      @attributes = self.class._default_attributes.deep_dup

      init_internals
      initialize_internals_callback

      assign_attributes(attributes) if attributes

      yield self if block_given?
      _run_initialize_callbacks
    end

🔎 See on GitHub

<=>(other_object)

Allows sort on objects

📝 Source code

# File activerecord/lib/active_record/core.rb, line 453
    def <=>(other_object)
      if other_object.is_a?(self.class)
        to_key <=> other_object.to_key
      else
        super
      end
    end

🔎 See on GitHub

==(comparison_object)

Returns true if comparison_object is the same exact object, or comparison_object is of the same type and self has an ID and it is equal to comparison_object.id.

Note that new records are different from any other record by definition, unless the other record is the receiver itself. Besides, if you fetch existing records with select and leave the ID out, you're on your own, this predicate will return false.

Note also that destroying a record preserves its ID in the model instance, so deleted models are still comparable.

Also aliased as: eql?

📝 Source code

# File activerecord/lib/active_record/core.rb, line 421
    def ==(comparison_object)
      super ||
        comparison_object.instance_of?(self.class) &&
        !id.nil? &&
        comparison_object.id == id
    end

🔎 See on GitHub

clone

Identical to Ruby's clone method. This is a “shallow” copy. Be warned that your attributes are not copied. That means that modifying attributes of the clone will modify the original, since they will both point to the same attributes hash. If you need a copy of your attributes hash, please use the dup method.

user = User.first
new_user = user.clone
user.name               # => "Bob"
new_user.name = "Joe"
user.name               # => "Joe"

user.object_id == new_user.object_id            # => false
user.name.object_id == new_user.name.object_id  # => true

user.name.object_id == user.dup.name.object_id  # => false

🔎 See on GitHub

connection_handler()

📝 Source code

# File activerecord/lib/active_record/core.rb, line 472
    def connection_handler
      self.class.connection_handler
    end

🔎 See on GitHub

dup

Duped objects have no id assigned and are treated as new records. Note that this is a “shallow” copy as it copies the object's attributes only, not its associations. The extent of a “deep” copy is application specific and is therefore left to the application to implement according to its need. The dup method does not preserve the timestamps (created|updated)_(at|on).

🔎 See on GitHub

encode_with(coder)

Populate coder with attributes about this record that should be serialized. The structure of coder defined in this method is guaranteed to match the structure of coder passed to the init_with method.

Example:

class Post < ActiveRecord::Base
end
coder = {}
Post.new.encode_with(coder)
coder # => {"attributes" => {"id" => nil, ... }}

📝 Source code

# File activerecord/lib/active_record/core.rb, line 406
    def encode_with(coder)
      self.class.yaml_encoder.encode(@attributes, coder)
      coder["new_record"] = new_record?
      coder["active_record_yaml_version"] = 2
    end

🔎 See on GitHub

eql?(comparison_object)

Alias for: ==

freeze()

Clone and freeze the attributes hash such that associations are still accessible, even on destroyed records, but cloned models will not be frozen.

📝 Source code

# File activerecord/lib/active_record/core.rb, line 442
    def freeze
      @attributes = @attributes.clone.freeze
      self
    end

🔎 See on GitHub

frozen?()

Returns true if the attributes hash has been frozen.

📝 Source code

# File activerecord/lib/active_record/core.rb, line 448
    def frozen?
      @attributes.frozen?
    end

🔎 See on GitHub

hash()

Delegates to id in order to allow two records of the same type and id to work with something like:

[ Person.find(1), Person.find(2), Person.find(3) ] & [ Person.find(1), Person.find(4) ] # => [ Person.find(1) ]

📝 Source code

# File activerecord/lib/active_record/core.rb, line 431
    def hash
      if id
        self.class.hash ^ id.hash
      else
        super
      end
    end

🔎 See on GitHub

init_with(coder)

Initialize an empty model object from coder. coder should be the result of previously encoding an Active Record model, using encode_with.

class Post < ActiveRecord::Base
end

old_post = Post.new(title: "hello world")
coder = {}
old_post.encode_with(coder)

post = Post.allocate
post.init_with(coder)
post.title # => 'hello world'

📝 Source code

# File activerecord/lib/active_record/core.rb, line 335
    def init_with(coder)
      coder = LegacyYamlAdapter.convert(self.class, coder)
      @attributes = self.class.yaml_encoder.decode(coder)

      init_internals

      @new_record = coder["new_record"]

      self.class.define_attribute_methods

      yield self if block_given?

      _run_find_callbacks
      _run_initialize_callbacks

      self
    end

🔎 See on GitHub

inspect()

Returns the contents of the record as a nicely formatted string.

📝 Source code

# File activerecord/lib/active_record/core.rb, line 477
    def inspect
      # We check defined?(@attributes) not to issue warnings if the object is
      # allocated but not initialized.
      inspection = if defined?(@attributes) && @attributes
        self.class.attribute_names.collect do |name|
          if has_attribute?(name)
            "#{name}: #{attribute_for_inspect(name)}"
          end
        end.compact.join(", ")
      else
        "not initialized"
      end

      "#<#{self.class} #{inspection}>"
    end

🔎 See on GitHub

pretty_print(pp)

Takes a PP and prettily prints this record to it, allowing you to get a nice result from pp record when pp is required.

📝 Source code

# File activerecord/lib/active_record/core.rb, line 495
    def pretty_print(pp)
      return super if custom_inspect_method_defined?
      pp.object_address_group(self) do
        if defined?(@attributes) && @attributes
          column_names = self.class.column_names.select { |name| has_attribute?(name) || new_record? }
          pp.seplist(column_names, proc { pp.text "," }) do |column_name|
            column_value = read_attribute(column_name)
            pp.breakable " "
            pp.group(1) do
              pp.text column_name
              pp.text ":"
              pp.breakable
              pp.pp column_value
            end
          end
        else
          pp.breakable " "
          pp.text "not initialized"
        end
      end
    end

🔎 See on GitHub

readonly!()

Marks this record as read only.

📝 Source code

# File activerecord/lib/active_record/core.rb, line 468
    def readonly!
      @readonly = true
    end

🔎 See on GitHub

readonly?()

Returns true if the record is read only. Records loaded through joins with piggy-back attributes will be marked as read only since they cannot be saved.

📝 Source code

# File activerecord/lib/active_record/core.rb, line 463
    def readonly?
      @readonly
    end

🔎 See on GitHub

slice(*methods)

Returns a hash of the given methods with their names as keys and returned values as values.

📝 Source code

# File activerecord/lib/active_record/core.rb, line 518
    def slice(*methods)
      Hash[methods.flatten.map! { |method| [method, public_send(method)] }].with_indifferent_access
    end

🔎 See on GitHub

ActiveRecord::Core

Methods

Class Public methods

configurations()

configurations=(config)

connection_handler()

connection_handler=(handler)

new(attributes = nil)

Example:

Instance Public methods

<=>(other_object)

==(comparison_object)

clone

connection_handler()

dup

encode_with(coder)

eql?(comparison_object)

freeze()

frozen?()

hash()

init_with(coder)

inspect()

pretty_print(pp)

readonly!()

readonly?()

slice(*methods)