aboutsummaryrefslogtreecommitdiffstats
path: root/activerecord/lib/active_record/errors.rb
blob: d710d96a9a99f60a011b0b8f188a0f278addbaa3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
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 +inheritance_column+ points to).
  class SubclassNotFound < ActiveRecordError #:nodoc:
  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 +connection=+ is given a nil object).
  class ConnectionNotEstablished < ActiveRecordError
  end

  # Raised when Active Record cannot find record by given id or set of ids.
  class RecordNotFound < ActiveRecordError
  end

  # Raised by ActiveRecord::Base.save! and ActiveRecord::Base.create! methods when record cannot be
  # saved because record is invalid.
  class RecordNotSaved < ActiveRecordError
    attr_reader :record

    def initialize(message, record = nil)
      @record = record
      super(message)
    end
  end

  # Raised by ActiveRecord::Base.destroy! when a call to 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(record)
      @record = record
      super()
    end
  end

  # Superclass for all database execution errors.
  #
  # Wraps the underlying database error as +original_exception+.
  class StatementInvalid < ActiveRecordError
    attr_reader :original_exception

    def initialize(message, original_exception = nil)
      super(message)
      @original_exception = original_exception
    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 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 number of bind variables in statement given to +:condition+ key
  # (for example, when using +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 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, attempted_action)
      super("Attempted to #{attempted_action} a stale object: #{record.class.name}")
      @record = record
      @attempted_action = attempted_action
    end

  end

  # Raised when association is being configured improperly or user tries to use
  # offset and limit together with +has_many+ or +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::Transactions::ClassMethods.transaction uses this exception
  # to distinguish a deliberate rollback from other exceptional situations.
  # Normally, raising an exception will cause the +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

  UnknownAttributeError = ActiveSupport::Deprecation::DeprecatedConstantProxy.new( # :nodoc:
    'ActiveRecord::UnknownAttributeError', 
    'ActiveModel::AttributeAssignment::UnknownAttributeError'
  )

  # Raised when an error occurred while doing a mass assignment to an attribute through the
  # +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, exception, attribute)
      super(message)
      @exception = exception
      @attribute = attribute
    end
  end

  # Raised when there are multiple errors while doing a mass assignment through the +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)
      @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)
      super("Unknown primary key for table #{model.table_name} in model #{model}.")
      @model = model
    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 mysql, mysql2 and postgresql adapters support setting the transaction isolation level.
  class TransactionIsolationError < ActiveRecordError
  end
end