Permalink
Find file
375 lines (325 sloc) 13.4 KB
# frozen_string_literal: true
module ActiveRecord
# = Active Record Errors
#
# Generic Active Record exception class.
class ActiveRecordError < StandardError
end
# Raised when the single-table inheritance mechanism fails to locate the subclass
# (for example due to improper usage of column that
# {ActiveRecord::Base.inheritance_column}[rdoc-ref:ModelSchema::ClassMethods#inheritance_column]
# points to).
class SubclassNotFound < ActiveRecordError
end
# Raised when an object assigned to an association has an incorrect type.
#
# class Ticket < ActiveRecord::Base
# has_many :patches
# end
#
# class Patch < ActiveRecord::Base
# belongs_to :ticket
# end
#
# # Comments are not patches, this assignment raises AssociationTypeMismatch.
# @ticket.patches << Comment.new(content: "Please attach tests to your patch.")
class AssociationTypeMismatch < ActiveRecordError
end
# Raised when unserialized object's type mismatches one specified for serializable field.
class SerializationTypeMismatch < ActiveRecordError
end
# Raised when adapter not specified on connection (or configuration file
# +config/database.yml+ misses adapter field).
class AdapterNotSpecified < ActiveRecordError
end
# Raised when Active Record cannot find database adapter specified in
# +config/database.yml+ or programmatically.
class AdapterNotFound < ActiveRecordError
end
# Raised when connection to the database could not been established (for example when
# {ActiveRecord::Base.connection=}[rdoc-ref:ConnectionHandling#connection]
# is given a +nil+ object).
class ConnectionNotEstablished < ActiveRecordError
end
# Raised when Active Record cannot find a record by given id or set of ids.
class RecordNotFound < ActiveRecordError
attr_reader :model, :primary_key, :id
def initialize(message = nil, model = nil, primary_key = nil, id = nil)
@primary_key = primary_key
@model = model
@id = id
super(message)
end
end
# Raised by {ActiveRecord::Base#save!}[rdoc-ref:Persistence#save!] and
# {ActiveRecord::Base.create!}[rdoc-ref:Persistence::ClassMethods#create!]
# methods when a record is invalid and can not be saved.
class RecordNotSaved < ActiveRecordError
attr_reader :record
def initialize(message = nil, record = nil)
@record = record
super(message)
end
end
# Raised by {ActiveRecord::Base#destroy!}[rdoc-ref:Persistence#destroy!]
# when a call to {#destroy}[rdoc-ref:Persistence#destroy!]
# would return false.
#
# begin
# complex_operation_that_internally_calls_destroy!
# rescue ActiveRecord::RecordNotDestroyed => invalid
# puts invalid.record.errors
# end
#
class RecordNotDestroyed < ActiveRecordError
attr_reader :record
def initialize(message = nil, record = nil)
@record = record
super(message)
end
end
# Superclass for all database execution errors.
#
# Wraps the underlying database error as +cause+.
class StatementInvalid < ActiveRecordError
def initialize(message = nil)
super(message || $!.try(:message))
end
end
# Defunct wrapper class kept for compatibility.
# StatementInvalid wraps the original exception now.
class WrappedDatabaseException < StatementInvalid
end
# Raised when a record cannot be inserted or updated because it would violate a uniqueness constraint.
class RecordNotUnique < WrappedDatabaseException
end
# Raised when a record cannot be inserted or updated because it references a non-existent record.
class InvalidForeignKey < WrappedDatabaseException
end
# Raised when a foreign key constraint cannot be added because the column type does not match the referenced column type.
class MismatchedForeignKey < StatementInvalid
def initialize(adapter = nil, message: nil, table: nil, foreign_key: nil, target_table: nil, primary_key: nil)
@adapter = adapter
if table
msg = <<-EOM.strip_heredoc
Column `#{foreign_key}` on table `#{table}` has a type of `#{column_type(table, foreign_key)}`.
This does not match column `#{primary_key}` on `#{target_table}`, which has type `#{column_type(target_table, primary_key)}`.
To resolve this issue, change the type of the `#{foreign_key}` column on `#{table}` to be :integer. (For example `t.integer #{foreign_key}`).
EOM
else
msg = <<-EOM
There is a mismatch between the foreign key and primary key column types.
Verify that the foreign key column type and the primary key of the associated table match types.
EOM
end
if message
msg << "\nOriginal message: #{message}"
end
super(msg)
end
private
def column_type(table, column)
@adapter.columns(table).detect { |c| c.name == column }.sql_type
end
end
# Raised when a record cannot be inserted or updated because it would violate a not null constraint.
class NotNullViolation < StatementInvalid
end
# Raised when a record cannot be inserted or updated because a value too long for a column type.
class ValueTooLong < StatementInvalid
end
# Raised when values that executed are out of range.
class RangeError < StatementInvalid
end
# Raised when number of bind variables in statement given to +:condition+ key
# (for example, when using {ActiveRecord::Base.find}[rdoc-ref:FinderMethods#find] method)
# does not match number of expected values supplied.
#
# For example, when there are two placeholders with only one value supplied:
#
# Location.where("lat = ? AND lng = ?", 53.7362)
class PreparedStatementInvalid < ActiveRecordError
end
# Raised when a given database does not exist.
class NoDatabaseError < StatementInvalid
end
# Raised when PostgreSQL returns 'cached plan must not change result type' and
# we cannot retry gracefully (e.g. inside a transaction)
class PreparedStatementCacheExpired < StatementInvalid
end
# Raised on attempt to save stale record. Record is stale when it's being saved in another query after
# instantiation, for example, when two users edit the same wiki page and one starts editing and saves
# the page before the other.
#
# Read more about optimistic locking in ActiveRecord::Locking module
# documentation.
class StaleObjectError < ActiveRecordError
attr_reader :record, :attempted_action
def initialize(record = nil, attempted_action = nil)
if record && attempted_action
@record = record
@attempted_action = attempted_action
super("Attempted to #{attempted_action} a stale object: #{record.class.name}.")
else
super("Stale object error.")
end
end
end
# Raised when association is being configured improperly or user tries to use
# offset and limit together with
# {ActiveRecord::Base.has_many}[rdoc-ref:Associations::ClassMethods#has_many] or
# {ActiveRecord::Base.has_and_belongs_to_many}[rdoc-ref:Associations::ClassMethods#has_and_belongs_to_many]
# associations.
class ConfigurationError < ActiveRecordError
end
# Raised on attempt to update record that is instantiated as read only.
class ReadOnlyRecord < ActiveRecordError
end
# {ActiveRecord::Base.transaction}[rdoc-ref:Transactions::ClassMethods#transaction]
# uses this exception to distinguish a deliberate rollback from other exceptional situations.
# Normally, raising an exception will cause the
# {.transaction}[rdoc-ref:Transactions::ClassMethods#transaction] method to rollback
# the database transaction *and* pass on the exception. But if you raise an
# ActiveRecord::Rollback exception, then the database transaction will be rolled back,
# without passing on the exception.
#
# For example, you could do this in your controller to rollback a transaction:
#
# class BooksController < ActionController::Base
# def create
# Book.transaction do
# book = Book.new(params[:book])
# book.save!
# if today_is_friday?
# # The system must fail on Friday so that our support department
# # won't be out of job. We silently rollback this transaction
# # without telling the user.
# raise ActiveRecord::Rollback, "Call tech support!"
# end
# end
# # ActiveRecord::Rollback is the only exception that won't be passed on
# # by ActiveRecord::Base.transaction, so this line will still be reached
# # even on Friday.
# redirect_to root_url
# end
# end
class Rollback < ActiveRecordError
end
# Raised when attribute has a name reserved by Active Record (when attribute
# has name of one of Active Record instance methods).
class DangerousAttributeError < ActiveRecordError
end
# Raised when unknown attributes are supplied via mass assignment.
UnknownAttributeError = ActiveModel::UnknownAttributeError
# Raised when an error occurred while doing a mass assignment to an attribute through the
# {ActiveRecord::Base#attributes=}[rdoc-ref:AttributeAssignment#attributes=] method.
# The exception has an +attribute+ property that is the name of the offending attribute.
class AttributeAssignmentError < ActiveRecordError
attr_reader :exception, :attribute
def initialize(message = nil, exception = nil, attribute = nil)
super(message)
@exception = exception
@attribute = attribute
end
end
# Raised when there are multiple errors while doing a mass assignment through the
# {ActiveRecord::Base#attributes=}[rdoc-ref:AttributeAssignment#attributes=]
# method. The exception has an +errors+ property that contains an array of AttributeAssignmentError
# objects, each corresponding to the error while assigning to an attribute.
class MultiparameterAssignmentErrors < ActiveRecordError
attr_reader :errors
def initialize(errors = nil)
@errors = errors
end
end
# Raised when a primary key is needed, but not specified in the schema or model.
class UnknownPrimaryKey < ActiveRecordError
attr_reader :model
def initialize(model = nil, description = nil)
if model
message = "Unknown primary key for table #{model.table_name} in model #{model}."
message += "\n#{description}" if description
@model = model
super(message)
else
super("Unknown primary key.")
end
end
end
# Raised when a relation cannot be mutated because it's already loaded.
#
# class Task < ActiveRecord::Base
# end
#
# relation = Task.all
# relation.loaded? # => true
#
# # Methods which try to mutate a loaded relation fail.
# relation.where!(title: 'TODO') # => ActiveRecord::ImmutableRelation
# relation.limit!(5) # => ActiveRecord::ImmutableRelation
class ImmutableRelation < ActiveRecordError
end
# TransactionIsolationError will be raised under the following conditions:
#
# * The adapter does not support setting the isolation level
# * You are joining an existing open transaction
# * You are creating a nested (savepoint) transaction
#
# The mysql2 and postgresql adapters support setting the transaction isolation level.
class TransactionIsolationError < ActiveRecordError
end
# TransactionRollbackError will be raised when a transaction is rolled
# back by the database due to a serialization failure or a deadlock.
#
# See the following:
#
# * https://www.postgresql.org/docs/current/static/transaction-iso.html
# * https://dev.mysql.com/doc/refman/5.7/en/error-messages-server.html#error_er_lock_deadlock
class TransactionRollbackError < StatementInvalid
end
# SerializationFailure will be raised when a transaction is rolled
# back by the database due to a serialization failure.
class SerializationFailure < TransactionRollbackError
end
# Deadlocked will be raised when a transaction is rolled
# back by the database when a deadlock is encountered.
class Deadlocked < TransactionRollbackError
end
# IrreversibleOrderError is raised when a relation's order is too complex for
# +reverse_order+ to automatically reverse.
class IrreversibleOrderError < ActiveRecordError
end
# LockWaitTimeout will be raised when lock wait timeout exceeded.
class LockWaitTimeout < StatementInvalid
end
# StatementTimeout will be raised when statement timeout exceeded.
class StatementTimeout < StatementInvalid
end
# QueryCanceled will be raised when canceling statement due to user request.
class QueryCanceled < StatementInvalid
end
# UnknownAttributeReference is raised when an unknown and potentially unsafe
# value is passed to a query method when allow_unsafe_raw_sql is set to
# :disabled. For example, passing a non column name value to a relation's
# #order method might cause this exception.
#
# When working around this exception, caution should be taken to avoid SQL
# injection vulnerabilities when passing user-provided values to query
# methods. Known-safe values can be passed to query methods by wrapping them
# in Arel.sql.
#
# For example, with allow_unsafe_raw_sql set to :disabled, the following
# code would raise this exception:
#
# Post.order("length(title)").first
#
# The desired result can be accomplished by wrapping the known-safe string
# in Arel.sql:
#
# Post.order(Arel.sql("length(title)")).first
#
# Again, such a workaround should *not* be used when passing user-provided
# values, such as request parameters or model attributes to query methods.
class UnknownAttributeReference < ActiveRecordError
end
end