method

connected_to_many

v6.1.7.7 - Show latest stable - 0 notes - Class: ConnectionHandling

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What's this?

connected_to_many(*classes, role:, shard: nil, prevent_writes: false) public

Connects a role and/or shard to the provided connection names. Optionally prevent_writes can be passed to block writes on a connection. reading will automatically set prevent_writes to true.

connected_to_many is an alternative to deeply nested connected_to blocks.

Usage:

ActiveRecord::Base.connected_to_many(AnimalsRecord, MealsRecord, role: :reading) do
  Dog.first # Read from animals replica
  Dinner.first # Read from meals replica
  Person.first # Read from primary writer
end

Show source

# File activerecord/lib/active_record/connection_handling.rb, line 194
    def connected_to_many(*classes, role,, shard: nil, prevent_writes: false)
      classes = classes.flatten

      if legacy_connection_handling
        raise NotImplementedError, "connected_to_many is not available with legacy connection handling"
      end

      if self != Base || classes.include?(Base)
        raise NotImplementedError, "connected_to_many can only be called on ActiveRecord::Base."
      end

      prevent_writes = true if role == reading_role

      connected_to_stack << { role: role, shard: shard, prevent_writes: prevent_writes, klasses: classes }
      yield
    ensure
      connected_to_stack.pop
    end

connected_to_many

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