Class: DB::Migrate::CreateIndex

Inherits:
Object
  • Object
show all
Defined in:
lib/db/migrate/create_index.rb

Instance Method Summary collapse

Constructor Details

#initialize(name, table, columns = [], unique: false, drop_if_exists: false, if_not_exists: false, method: nil) ⇒ CreateIndex

Returns a new instance of CreateIndex.



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# File 'lib/db/migrate/create_index.rb', line 11

def initialize(name, table, columns = [], unique: false, drop_if_exists: false, if_not_exists: false, method: nil)
	@name = name
	@table = table
	@columns = Array(columns)
	
	@unique = unique
	@drop_if_exists = drop_if_exists
	@if_not_exists = if_not_exists
	@method = method
end

Instance Method Details

#call(session) ⇒ Object 



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# File 'lib/db/migrate/create_index.rb', line 22

def call(session)
	if @drop_if_exists
		DropIndex.new(@name, if_exists: true).call(session)
	end
	
	if @unique
		statement = session.clause("CREATE UNIQUE INDEX")
	else
		statement = session.clause("CREATE INDEX")
	end
	
	if @if_not_exists
		statement.clause("IF NOT EXISTS")
	end
	
	statement.identifier(@name)
	
	statement.clause("ON")
	statement.identifier(@table)
	
	if @method
		statement.clause("USING")
		statement.identifier(@method)
	end
	
	statement.clause("(")
	first = true
	indexes = []
	
	@columns.each do |name|
		if first
			first = false
		else
			statement.clause(",")
		end
		
		statement.identifier(name)
	end
	
	statement.clause(")")
	
	Console.logger.info(self, statement)
	statement.call
end