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require "active_support/core_ext/string/strip"
module ActiveRecord
module ConnectionAdapters
class AbstractAdapter
class SchemaCreation # :nodoc:
def initialize(conn)
@conn = conn
@cache = {}
end
def accept(o)
m = @cache[o.class] ||= "visit_#{o.class.name.split('::').last}"
send m, o
end
delegate :quote_column_name, :quote_table_name, :quote_default_expression, :type_to_sql,
:options_include_default?, :supports_indexes_in_create?, :supports_foreign_keys_in_create?, :foreign_key_options, to: :@conn
private :quote_column_name, :quote_table_name, :quote_default_expression, :type_to_sql,
:options_include_default?, :supports_indexes_in_create?, :supports_foreign_keys_in_create?, :foreign_key_options
private
def visit_AlterTable(o)
sql = "ALTER TABLE #{quote_table_name(o.name)} ".dup
sql << o.adds.map { |col| accept col }.join(" ")
sql << o.foreign_key_adds.map { |fk| visit_AddForeignKey fk }.join(" ")
sql << o.foreign_key_drops.map { |fk| visit_DropForeignKey fk }.join(" ")
end
def visit_ColumnDefinition(o)
o.sql_type = type_to_sql(o.type, o.options)
column_sql = "#{quote_column_name(o.name)} #{o.sql_type}".dup
add_column_options!(column_sql, column_options(o)) unless o.type == :primary_key
column_sql
end
def visit_AddColumnDefinition(o)
"ADD #{accept(o.column)}".dup
end
def visit_TableDefinition(o)
create_sql = "CREATE#{' TEMPORARY' if o.temporary} TABLE #{quote_table_name(o.name)} ".dup
statements = o.columns.map { |c| accept c }
statements << accept(o.primary_keys) if o.primary_keys
if supports_indexes_in_create?
statements.concat(o.indexes.map { |column_name, options| index_in_create(o.name, column_name, options) })
end
if supports_foreign_keys_in_create?
statements.concat(o.foreign_keys.map { |to_table, options| foreign_key_in_create(o.name, to_table, options) })
end
create_sql << "(#{statements.join(', ')})" if statements.present?
add_table_options!(create_sql, table_options(o))
create_sql << " AS #{to_sql(o.as)}" if o.as
create_sql
end
def visit_PrimaryKeyDefinition(o)
"PRIMARY KEY (#{o.name.join(', ')})"
end
def visit_ForeignKeyDefinition(o)
sql = <<-SQL.strip_heredoc
CONSTRAINT #{quote_column_name(o.name)}
FOREIGN KEY (#{quote_column_name(o.column)})
REFERENCES #{quote_table_name(o.to_table)} (#{quote_column_name(o.primary_key)})
SQL
sql << " #{action_sql('DELETE', o.on_delete)}" if o.on_delete
sql << " #{action_sql('UPDATE', o.on_update)}" if o.on_update
sql
end
def visit_AddForeignKey(o)
"ADD #{accept(o)}"
end
def visit_DropForeignKey(name)
"DROP CONSTRAINT #{quote_column_name(name)}"
end
def table_options(o)
table_options = {}
table_options[:comment] = o.comment
table_options[:options] = o.options
table_options
end
def add_table_options!(create_sql, options)
if options_sql = options[:options]
create_sql << " #{options_sql}"
end
end
def column_options(o)
o.options.merge(column: o)
end
def add_column_options!(sql, options)
sql << " DEFAULT #{quote_default_expression(options[:default], options[:column])}" if options_include_default?(options)
# must explicitly check for :null to allow change_column to work on migrations
if options[:null] == false
sql << " NOT NULL"
end
if options[:auto_increment] == true
sql << " AUTO_INCREMENT"
end
if options[:primary_key] == true
sql << " PRIMARY KEY"
end
sql
end
def to_sql(sql)
sql = sql.to_sql if sql.respond_to?(:to_sql)
sql
end
def foreign_key_in_create(from_table, to_table, options)
options = foreign_key_options(from_table, to_table, options)
accept ForeignKeyDefinition.new(from_table, to_table, options)
end
def action_sql(action, dependency)
case dependency
when :nullify then "ON #{action} SET NULL"
when :cascade then "ON #{action} CASCADE"
when :restrict then "ON #{action} RESTRICT"
else
raise ArgumentError, <<-MSG.strip_heredoc
'#{dependency}' is not supported for :on_update or :on_delete.
Supported values are: :nullify, :cascade, :restrict
MSG
end
end
end
end
SchemaCreation = AbstractAdapter::SchemaCreation # :nodoc:
end
end
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