### Home Classes Methods

### In Files

- lib/active_record/scoping/default.rb

### Methods

- #default_scope
- #evaluate_default_scope

### Files

- README.rdoc

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# ActiveRecord::Scoping::Default::ClassMethods

### Protected Instance Methods

default_scope(scope = {}) click to toggle source

Use this macro in your model to set a default scope for all operations on the model.

    class Article < ActiveRecord::Base
      default_scope where(:published => true)
    end

    Article.all # => SELECT * FROM articles WHERE published = true

The `default_scope` is also applied while creating/building a record. It is not applied while updating a record.

    Article.new.published    # => true
    Article.create.published # => true

You can also use `default_scope` with a block, in order to have it lazily evaluated:

    class Article < ActiveRecord::Base
      default_scope { where(:published_at => Time.now - 1.week) }
    end

(You can also pass any object which responds to `call` to the `default_scope` macro, and it will be called when building the default scope.)

If you use multiple `default_scope` declarations in your model then they will be merged together:

    class Article < ActiveRecord::Base
      default_scope where(:published => true)
      default_scope where(:rating => 'G')
    end

    Article.all # => SELECT * FROM articles WHERE published = true AND rating = 'G'

This is also the case with inheritance and module includes where the parent or module defines a `default_scope` and the child or including class defines a second one.

If you need to do more complex things with a default scope, you can alternatively define it as a class method:

    class Article < ActiveRecord::Base
      def self.default_scope
        # Should return a scope, you can call 'super' here etc.
      end
    end

    # File lib/active_record/scoping/default.rb, line 95
    def default_scope(scope = {})
      scope = Proc.new if block_given?
      self.default_scopes = default_scopes + [scope]
    end

evaluate_default_scope() click to toggle source

The ignore_default_scope flag is used to prevent an infinite recursion situation where a default scope references a scope which has a default scope which references a scope...

    # File lib/active_record/scoping/default.rb, line 128
    def evaluate_default_scope
      return if ignore_default_scope?

      begin
        self.ignore_default_scope = true
        yield
      ensure
        self.ignore_default_scope = false
      end
    end

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