class ActiveRecord::ConnectionAdapters::PostgreSQLAdapter
The PostgreSQL adapter works with the native C (github.com/ged/ruby-pg) driver.
Options:
-
:host
- Defaults to a Unix-domain socket in /tmp. On machines without Unix-domain sockets, the default is to connect to localhost. -
:port
- Defaults to 5432. -
:username
- Defaults to be the same as the operating system name of the user running the application. -
:password
- Password to be used if the server demands password authentication. -
:database
- Defaults to be the same as the user name. -
:schema_search_path
- An optional schema search path for the connection given as a string of comma-separated schema names. This is backward-compatible with the:schema_order
option. -
:encoding
- An optional client encoding that is used in aSET client_encoding TO <encoding>
call on the connection. -
:min_messages
- An optional client min messages that is used in aSET client_min_messages TO <min_messages>
call on the connection. -
:variables
- An optional hash of additional parameters that will be used inSET SESSION key = val
calls on the connection. -
:insert_returning
- An optional boolean to control the use ofRETURNING
forINSERT
statements defaults to true.
Any further options are used as connection parameters to libpq. See www.postgresql.org/docs/current/static/libpq-connect.html for the list of parameters.
In addition, default connection parameters of libpq can be set per environment variables. See www.postgresql.org/docs/current/static/libpq-envars.html .
Constants
- ADAPTER_NAME
- DEADLOCK_DETECTED
- DUPLICATE_DATABASE
- FOREIGN_KEY_VIOLATION
- LOCK_NOT_AVAILABLE
- NATIVE_DATABASE_TYPES
- NOT_NULL_VIOLATION
- NUMERIC_VALUE_OUT_OF_RANGE
- QUERY_CANCELED
- SERIALIZATION_FAILURE
- UNIQUE_VIOLATION
- VALUE_LIMIT_VIOLATION
See www.postgresql.org/docs/current/static/errcodes-appendix.html
Public Class Methods
PostgreSQL allows the creation of “unlogged” tables, which do not record data in the PostgreSQL Write-Ahead Log. This can make the tables faster, but significantly increases the risk of data loss if the database crashes. As a result, this should not be used in production environments. If you would like all created tables to be unlogged in the test environment you can add the following line to your test.rb file:
ActiveRecord::ConnectionAdapters::PostgreSQLAdapter.create_unlogged_tables = true
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 99 class_attribute :create_unlogged_tables, default: false
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 266 def self.database_exists?(config) !!ActiveRecord::Base.postgresql_connection(config) rescue ActiveRecord::NoDatabaseError false end
Initializes and connects a PostgreSQL adapter.
ActiveRecord::ConnectionAdapters::QueryCache::new
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 247 def initialize(connection, logger, connection_parameters, config) super(connection, logger, config) @connection_parameters = connection_parameters || {} # @local_tz is initialized as nil to avoid warnings when connect tries to use it @local_tz = nil @max_identifier_length = nil configure_connection add_pg_encoders add_pg_decoders @type_map = Type::HashLookupTypeMap.new initialize_type_map @local_tz = execute("SHOW TIME ZONE", "SCHEMA").first["TimeZone"] @use_insert_returning = @config.key?(:insert_returning) ? self.class.type_cast_config_to_boolean(@config[:insert_returning]) : true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 77 def new_client(conn_params) PG.connect(**conn_params) rescue ::PG::Error => error if conn_params && conn_params[:dbname] && error.message.include?(conn_params[:dbname]) raise ActiveRecord::NoDatabaseError else raise ActiveRecord::ConnectionNotEstablished, error.message end end
Public Instance Methods
Is this connection alive and ready for queries?
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 273 def active? @lock.synchronize do @connection.query "SELECT 1" end true rescue PG::Error false end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 391 def disable_extension(name) exec_query("DROP EXTENSION IF EXISTS \"#{name}\" CASCADE").tap { reload_type_map } end
Disconnects from the database if already connected. Otherwise, this method does nothing.
ActiveRecord::ConnectionAdapters::AbstractAdapter#disconnect!
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 307 def disconnect! @lock.synchronize do super @connection.close rescue nil end end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 385 def enable_extension(name) exec_query("CREATE EXTENSION IF NOT EXISTS \"#{name}\"").tap { reload_type_map } end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 397 def extension_available?(name) query_value("SELECT true FROM pg_available_extensions WHERE name = #{quote(name)}", "SCHEMA") end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 401 def extension_enabled?(name) query_value("SELECT installed_version IS NOT NULL FROM pg_available_extensions WHERE name = #{quote(name)}", "SCHEMA") end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 405 def extensions exec_query("SELECT extname FROM pg_extension", "SCHEMA").cast_values end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 218 def index_algorithms { concurrently: "CONCURRENTLY" } end
Returns the configured supported identifier length supported by PostgreSQL
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 410 def max_identifier_length @max_identifier_length ||= query_value("SHOW max_identifier_length", "SCHEMA").to_i end
Close then reopen the connection.
ActiveRecord::ConnectionAdapters::AbstractAdapter#reconnect!
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 283 def reconnect! @lock.synchronize do super @connection.reset configure_connection rescue PG::ConnectionBad connect end end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 293 def reset! @lock.synchronize do clear_cache! reset_transaction unless @connection.transaction_status == ::PG::PQTRANS_IDLE @connection.query "ROLLBACK" end @connection.query "DISCARD ALL" configure_connection end end
Set the authorized user for this session
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 415 def session_auth=(user) clear_cache! execute("SET SESSION AUTHORIZATION #{user}") end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 324 def set_standard_conforming_strings execute("SET standard_conforming_strings = on", "SCHEMA") end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 332 def supports_advisory_locks? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 151 def supports_bulk_alter? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 179 def supports_check_constraints? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 199 def supports_comments? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 363 def supports_common_table_expressions? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 191 def supports_datetime_with_precision? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 328 def supports_ddl_transactions? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 336 def supports_explain? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 167 def supports_expression_index? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 340 def supports_extensions? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 175 def supports_foreign_keys? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 348 def supports_foreign_tables? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 155 def supports_index_sort_order? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 211 def supports_insert_on_conflict? database_version >= 90500 end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 207 def supports_insert_returning? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 195 def supports_json? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 367 def supports_lazy_transactions? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 344 def supports_materialized_views? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 356 def supports_optimizer_hints? unless defined?(@has_pg_hint_plan) @has_pg_hint_plan = extension_available?("pg_hint_plan") end @has_pg_hint_plan end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 163 def supports_partial_index? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 159 def supports_partitioned_indexes? database_version >= 110_000 end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 352 def supports_pgcrypto_uuid? database_version >= 90400 end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 203 def supports_savepoints? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 171 def supports_transaction_isolation? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 183 def supports_validate_constraints? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 187 def supports_views? true end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 420 def use_insert_returning? @use_insert_returning end
Private Instance Methods
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 889 def add_pg_decoders @default_timezone = nil @timestamp_decoder = nil coders_by_name = { "int2" => PG::TextDecoder::Integer, "int4" => PG::TextDecoder::Integer, "int8" => PG::TextDecoder::Integer, "oid" => PG::TextDecoder::Integer, "float4" => PG::TextDecoder::Float, "float8" => PG::TextDecoder::Float, "numeric" => PG::TextDecoder::Numeric, "bool" => PG::TextDecoder::Boolean, "timestamp" => PG::TextDecoder::TimestampUtc, "timestamptz" => PG::TextDecoder::TimestampWithTimeZone, } known_coder_types = coders_by_name.keys.map { |n| quote(n) } query = <<~SQL % known_coder_types.join(", ") SELECT t.oid, t.typname FROM pg_type as t WHERE t.typname IN (%s) SQL coders = execute_and_clear(query, "SCHEMA", []) do |result| result .map { |row| construct_coder(row, coders_by_name[row["typname"]]) } .compact end map = PG::TypeMapByOid.new coders.each { |coder| map.add_coder(coder) } @connection.type_map_for_results = map @type_map_for_results = PG::TypeMapByOid.new @type_map_for_results.default_type_map = map @type_map_for_results.add_coder(PG::TextDecoder::Bytea.new(oid: 17, name: "bytea")) @type_map_for_results.add_coder(MoneyDecoder.new(oid: 790, name: "money")) # extract timestamp decoder for use in update_typemap_for_default_timezone @timestamp_decoder = coders.find { |coder| coder.name == "timestamp" } update_typemap_for_default_timezone end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 869 def add_pg_encoders map = PG::TypeMapByClass.new map[Integer] = PG::TextEncoder::Integer.new map[TrueClass] = PG::TextEncoder::Boolean.new map[FalseClass] = PG::TextEncoder::Boolean.new @connection.type_map_for_queries = map end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 839 def arel_visitor Arel::Visitors::PostgreSQL.new(self) end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 843 def build_statement_pool StatementPool.new(@connection, self.class.type_cast_config_to_integer(@config[:statement_limit])) end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 847 def can_perform_case_insensitive_comparison_for?(column) @case_insensitive_cache ||= {} @case_insensitive_cache[column.sql_type] ||= begin sql = <<~SQL SELECT exists( SELECT * FROM pg_proc WHERE proname = 'lower' AND proargtypes = ARRAY[#{quote column.sql_type}::regtype]::oidvector ) OR exists( SELECT * FROM pg_proc INNER JOIN pg_cast ON ARRAY[casttarget]::oidvector = proargtypes WHERE proname = 'lower' AND castsource = #{quote column.sql_type}::regtype ) SQL execute_and_clear(sql, "SCHEMA", []) do |result| result.getvalue(0, 0) end end end
Returns the list of a table's column names, data types, and default values.
The underlying query is roughly:
SELECT column.name, column.type, default.value, column.comment FROM column LEFT JOIN default ON column.table_id = default.table_id AND column.num = default.column_num WHERE column.table_id = get_table_id('table_name') AND column.num > 0 AND NOT column.is_dropped ORDER BY column.num
If the table name is not prefixed with a schema, the database will take the first match from the schema search path.
Query implementation notes:
- format_type includes the column size constraint, e.g. varchar(50) - ::regclass is a function that gives the id for a table name
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 819 def column_definitions(table_name) query(<<~SQL, "SCHEMA") SELECT a.attname, format_type(a.atttypid, a.atttypmod), pg_get_expr(d.adbin, d.adrelid), a.attnotnull, a.atttypid, a.atttypmod, c.collname, col_description(a.attrelid, a.attnum) AS comment FROM pg_attribute a LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum LEFT JOIN pg_type t ON a.atttypid = t.oid LEFT JOIN pg_collation c ON a.attcollation = c.oid AND a.attcollation <> t.typcollation WHERE a.attrelid = #{quote(quote_table_name(table_name))}::regclass AND a.attnum > 0 AND NOT a.attisdropped ORDER BY a.attnum SQL end
Configures the encoding, verbosity, schema search path, and time zone of the connection. This is called by connect
and should not be called manually.
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 764 def configure_connection if @config[:encoding] @connection.set_client_encoding(@config[:encoding]) end self.client_min_messages = @config[:min_messages] || "warning" self.schema_search_path = @config[:schema_search_path] || @config[:schema_order] # Use standard-conforming strings so we don't have to do the E'...' dance. set_standard_conforming_strings variables = @config.fetch(:variables, {}).stringify_keys # If using Active Record's time zone support configure the connection to return # TIMESTAMP WITH ZONE types in UTC. unless variables["timezone"] if ActiveRecord::Base.default_timezone == :utc variables["timezone"] = "UTC" elsif @local_tz variables["timezone"] = @local_tz end end # Set interval output format to ISO 8601 for ease of parsing by ActiveSupport::Duration.parse execute("SET intervalstyle = iso_8601", "SCHEMA") # SET statements from :variables config hash # https://www.postgresql.org/docs/current/static/sql-set.html variables.map do |k, v| if v == ":default" || v == :default # Sets the value to the global or compile default execute("SET SESSION #{k} TO DEFAULT", "SCHEMA") elsif !v.nil? execute("SET SESSION #{k} TO #{quote(v)}", "SCHEMA") end end end
Connects to a PostgreSQL server and sets up the adapter depending on the connected server's characteristics.
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 755 def connect @connection = self.class.new_client(@connection_parameters) configure_connection add_pg_encoders add_pg_decoders end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 932 def construct_coder(row, coder_class) return unless coder_class coder_class.new(oid: row["oid"].to_i, name: row["typname"]) end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 677 def exec_cache(sql, name, binds) materialize_transactions mark_transaction_written_if_write(sql) update_typemap_for_default_timezone stmt_key = prepare_statement(sql, binds) type_casted_binds = type_casted_binds(binds) log(sql, name, binds, type_casted_binds, stmt_key) do ActiveSupport::Dependencies.interlock.permit_concurrent_loads do @connection.exec_prepared(stmt_key, type_casted_binds) end end rescue ActiveRecord::StatementInvalid => e raise unless is_cached_plan_failure?(e) # Nothing we can do if we are in a transaction because all commands # will raise InFailedSQLTransaction if in_transaction? raise ActiveRecord::PreparedStatementCacheExpired.new(e.cause.message) else @lock.synchronize do # outside of transactions we can simply flush this query and retry @statements.delete sql_key(sql) end retry end end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 661 def exec_no_cache(sql, name, binds) materialize_transactions mark_transaction_written_if_write(sql) # make sure we carry over any changes to ActiveRecord::Base.default_timezone that have been # made since we established the connection update_typemap_for_default_timezone type_casted_binds = type_casted_binds(binds) log(sql, name, binds, type_casted_binds) do ActiveSupport::Dependencies.interlock.permit_concurrent_loads do @connection.exec_params(sql, type_casted_binds) end end end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 643 def execute_and_clear(sql, name, binds, prepare: false) if preventing_writes? && write_query?(sql) raise ActiveRecord::ReadOnlyError, "Write query attempted while in readonly mode: #{sql}" end if !prepare || without_prepared_statement?(binds) result = exec_no_cache(sql, name, binds) else result = exec_cache(sql, name, binds) end begin ret = yield result ensure result.clear end ret end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 613 def extract_default_function(default_value, default) default if has_default_function?(default_value, default) end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 834 def extract_table_ref_from_insert_sql(sql) sql[/into\s("[A-Za-z0-9_."\[\]\s]+"|[A-Za-z0-9_."\[\]]+)\s*/im] $1.strip if $1 end
Extracts the value from a PostgreSQL column default definition.
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 587 def extract_value_from_default(default) case default # Quoted types when /\A[\(B]?'(.*)'.*::"?([\w. ]+)"?(?:\[\])?\z/m # The default 'now'::date is CURRENT_DATE if $1 == "now" && $2 == "date" nil else $1.gsub("''", "'") end # Boolean types when "true", "false" default # Numeric types when /\A\(?(-?\d+(\.\d*)?)\)?(::bigint)?\z/ $1 # Object identifier types when /\A-?\d+\z/ $1 else # Anything else is blank, some user type, or some function # and we can't know the value of that, so return nil. nil end end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 503 def get_oid_type(oid, fmod, column_name, sql_type = "") if !type_map.key?(oid) load_additional_types([oid]) end type_map.fetch(oid, fmod, sql_type) { warn "unknown OID #{oid}: failed to recognize type of '#{column_name}'. It will be treated as String." Type.default_value.tap do |cast_type| type_map.register_type(oid, cast_type) end } end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 617 def has_default_function?(default_value, default) !default_value && %r{\w+\(.*\)|\(.*\)::\w+|CURRENT_DATE|CURRENT_TIMESTAMP}.match?(default) end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 723 def in_transaction? open_transactions > 0 end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 516 def initialize_type_map(m = type_map) m.register_type "int2", Type::Integer.new(limit: 2) m.register_type "int4", Type::Integer.new(limit: 4) m.register_type "int8", Type::Integer.new(limit: 8) m.register_type "oid", OID::Oid.new m.register_type "float4", Type::Float.new m.alias_type "float8", "float4" m.register_type "text", Type::Text.new register_class_with_limit m, "varchar", Type::String m.alias_type "char", "varchar" m.alias_type "name", "varchar" m.alias_type "bpchar", "varchar" m.register_type "bool", Type::Boolean.new register_class_with_limit m, "bit", OID::Bit register_class_with_limit m, "varbit", OID::BitVarying m.alias_type "timestamptz", "timestamp" m.register_type "date", OID::Date.new m.register_type "money", OID::Money.new m.register_type "bytea", OID::Bytea.new m.register_type "point", OID::Point.new m.register_type "hstore", OID::Hstore.new m.register_type "json", Type::Json.new m.register_type "jsonb", OID::Jsonb.new m.register_type "cidr", OID::Cidr.new m.register_type "inet", OID::Inet.new m.register_type "uuid", OID::Uuid.new m.register_type "xml", OID::Xml.new m.register_type "tsvector", OID::SpecializedString.new(:tsvector) m.register_type "macaddr", OID::Macaddr.new m.register_type "citext", OID::SpecializedString.new(:citext) m.register_type "ltree", OID::SpecializedString.new(:ltree) m.register_type "line", OID::SpecializedString.new(:line) m.register_type "lseg", OID::SpecializedString.new(:lseg) m.register_type "box", OID::SpecializedString.new(:box) m.register_type "path", OID::SpecializedString.new(:path) m.register_type "polygon", OID::SpecializedString.new(:polygon) m.register_type "circle", OID::SpecializedString.new(:circle) register_class_with_precision m, "time", Type::Time register_class_with_precision m, "timestamp", OID::DateTime m.register_type "numeric" do |_, fmod, sql_type| precision = extract_precision(sql_type) scale = extract_scale(sql_type) # The type for the numeric depends on the width of the field, # so we'll do something special here. # # When dealing with decimal columns: # # places after decimal = fmod - 4 & 0xffff # places before decimal = (fmod - 4) >> 16 & 0xffff if fmod && (fmod - 4 & 0xffff).zero? # FIXME: Remove this class, and the second argument to # lookups on PG Type::DecimalWithoutScale.new(precision: precision) else OID::Decimal.new(precision: precision, scale: scale) end end m.register_type "interval" do |*args, sql_type| precision = extract_precision(sql_type) OID::Interval.new(precision: precision) end load_additional_types end
Annoyingly, the code for prepared statements whose return value may have changed is FEATURE_NOT_SUPPORTED.
This covers various different error types so we need to do additional work to classify the exception definitively as a ActiveRecord::PreparedStatementCacheExpired
Check here for more details: git.postgresql.org/gitweb/?p=postgresql.git;a=blob;f=src/backend/utils/cache/plancache.c#l573
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 715 def is_cached_plan_failure?(e) pgerror = e.cause pgerror.result.result_error_field(PG::PG_DIAG_SQLSTATE) == FEATURE_NOT_SUPPORTED && pgerror.result.result_error_field(PG::PG_DIAG_SOURCE_FUNCTION) == "RevalidateCachedQuery" rescue false end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 621 def load_additional_types(oids = nil) initializer = OID::TypeMapInitializer.new(type_map) query = <<~SQL SELECT t.oid, t.typname, t.typelem, t.typdelim, t.typinput, r.rngsubtype, t.typtype, t.typbasetype FROM pg_type as t LEFT JOIN pg_range as r ON oid = rngtypid SQL if oids query += "WHERE t.oid IN (%s)" % oids.join(", ") else query += initializer.query_conditions_for_initial_load end execute_and_clear(query, "SCHEMA", []) do |records| initializer.run(records) end end
Prepare the statement if it hasn't been prepared, return the statement key.
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 735 def prepare_statement(sql, binds) @lock.synchronize do sql_key = sql_key(sql) unless @statements.key? sql_key nextkey = @statements.next_key begin @connection.prepare nextkey, sql rescue => e raise translate_exception_class(e, sql, binds) end # Clear the queue @connection.get_last_result @statements[sql_key] = nextkey end @statements[sql_key] end end
Returns the statement identifier for the client side cache of statements
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 729 def sql_key(sql) "#{schema_search_path}-#{sql}" end
ActiveRecord::ConnectionAdapters::AbstractAdapter#translate_exception
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 468 def translate_exception(exception, message:, sql:, binds:) return exception unless exception.respond_to?(:result) case exception.result.try(:error_field, PG::PG_DIAG_SQLSTATE) when nil if exception.message.match?(/connection is closed/i) ConnectionNotEstablished.new(exception) else super end when UNIQUE_VIOLATION RecordNotUnique.new(message, sql: sql, binds: binds) when FOREIGN_KEY_VIOLATION InvalidForeignKey.new(message, sql: sql, binds: binds) when VALUE_LIMIT_VIOLATION ValueTooLong.new(message, sql: sql, binds: binds) when NUMERIC_VALUE_OUT_OF_RANGE RangeError.new(message, sql: sql, binds: binds) when NOT_NULL_VIOLATION NotNullViolation.new(message, sql: sql, binds: binds) when SERIALIZATION_FAILURE SerializationFailure.new(message, sql: sql, binds: binds) when DEADLOCK_DETECTED Deadlocked.new(message, sql: sql, binds: binds) when DUPLICATE_DATABASE DatabaseAlreadyExists.new(message, sql: sql, binds: binds) when LOCK_NOT_AVAILABLE LockWaitTimeout.new(message, sql: sql, binds: binds) when QUERY_CANCELED QueryCanceled.new(message, sql: sql, binds: binds) else super end end
# File lib/active_record/connection_adapters/postgresql_adapter.rb, line 877 def update_typemap_for_default_timezone if @default_timezone != ActiveRecord::Base.default_timezone && @timestamp_decoder decoder_class = ActiveRecord::Base.default_timezone == :utc ? PG::TextDecoder::TimestampUtc : PG::TextDecoder::TimestampWithoutTimeZone @timestamp_decoder = decoder_class.new(@timestamp_decoder.to_h) @connection.type_map_for_results.add_coder(@timestamp_decoder) @default_timezone = ActiveRecord::Base.default_timezone end end