class ActiveRecord::Associations::AliasTracker

Experimental RBS support (using type sampling data from the type_fusion project). 

# sig/active_record/associations/alias_tracker.rbs

class ActiveRecord::Associations::AliasTracker
  def self.create: (ActiveRecord::ConnectionAdapters::PostgreSQLAdapter connection, String initial_table, Array[] joins, ?Hash aliases) -> ActiveRecord::Associations::AliasTracker
end

:nodoc:
Keeps track of table aliases for ActiveRecord::Associations::JoinDependency

def self.create(connection, initial_table, joins, aliases = nil)

Experimental RBS support (using type sampling data from the type_fusion project). 

def self.create: (ActiveRecord::ConnectionAdapters::PostgreSQLAdapter connection, String initial_table,  joins, ?api_tokens | Integer aliases) -> ActiveRecord::Associations::AliasTracker

This signature was generated using 1 sample from 1 application.

:nodoc:
Keeps track of table aliases for ActiveRecord::Associations::JoinDependency 
def self.create(connection, initial_table, joins, aliases = nil)
  if joins.empty?
    aliases ||= Hash.new(0)
  elsif aliases
    default_proc = aliases.default_proc || proc { 0 }
    aliases.default_proc = proc { |h, k|
      h[k] = initial_count_for(connection, k, joins) + default_proc.call(h, k)
    }
  else
    aliases = Hash.new { |h, k|
      h[k] = initial_count_for(connection, k, joins)
    }
  end
  aliases[initial_table] = 1
  new(connection, aliases)
end

def self.initial_count_for(connection, name, table_joins) 

def self.initial_count_for(connection, name, table_joins)
  quoted_name = nil
  counts = table_joins.map do |join|
    if join.is_a?(Arel::Nodes::StringJoin)
      # quoted_name should be case ignored as some database adapters (Oracle) return quoted name in uppercase
      quoted_name ||= connection.quote_table_name(name)
      # Table names + table aliases
      join.left.scan(
        /JOIN(?:\s+\w+)?\s+(?:\S+\s+)?(?:#{quoted_name}|#{name})\sON/i
      ).size
    elsif join.is_a?(Arel::Nodes::Join)
      join.left.name == name ? 1 : 0
    else
      raise ArgumentError, "joins list should be initialized by list of Arel::Nodes::Join"
    end
  end
  counts.sum
end

def aliased_table_for(arel_table, table_name = nil) 

def aliased_table_for(arel_table, table_name = nil)
  table_name ||= arel_table.name
  if aliases[table_name] == 0
    # If it's zero, we can have our table_name
    aliases[table_name] = 1
    arel_table = arel_table.alias(table_name) if arel_table.name != table_name
  else
    # Otherwise, we need to use an alias
    aliased_name = @connection.table_alias_for(yield)
    # Update the count
    count = aliases[aliased_name] += 1
    aliased_name = "#{truncate(aliased_name)}_#{count}" if count > 1
    arel_table = arel_table.alias(aliased_name)
  end
  arel_table
end

def initialize(connection, aliases)

table_joins is an array of arel joins which might conflict with the aliases we assign here 
def initialize(connection, aliases)
  @aliases    = aliases
  @connection = connection
end

def truncate(name) 

def truncate(name)
  name.slice(0, @connection.table_alias_length - 2)
end