Module: ActiveRecord::Import::PostgreSQLAdapter

Includes:
ImportSupport, OnDuplicateKeyUpdateSupport
Included in:
ConnectionAdapters::PostgreSQLAdapter
Defined in:
lib/activerecord-import/adapters/postgresql_adapter.rb

Constant Summary collapse

MIN_VERSION_FOR_UPSERT = 
90_500

Instance Method Summary collapse

Methods included from ImportSupport

#supports_import?

Instance Method Details

#add_column_for_on_duplicate_key_update(column, options = {}) ⇒ Object

Add a column to be updated on duplicate key update



111
112
113
114
115
116
117
118
119
120
121
122
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 111

def add_column_for_on_duplicate_key_update( column, options = {} ) # :nodoc:
  arg = options[:on_duplicate_key_update]
  if arg.is_a?( Hash )
    columns = arg.fetch( :columns ) { arg[:columns] = [] }
    case columns
    when Array then columns << column.to_sym unless columns.include?( column.to_sym )
    when Hash then columns[column.to_sym] = column.to_sym
    end
  elsif arg.is_a?( Array )
    arg << column.to_sym unless arg.include?( column.to_sym )
  end
end

#database_version ⇒ Object 



219
220
221
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 219

def database_version
  defined?(postgresql_version) ? postgresql_version : super
end

#duplicate_key_update_error?(exception) ⇒ Boolean

Return true if the statement is a duplicate key record error

Returns:

  • (Boolean) 


207
208
209
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 207

def duplicate_key_update_error?(exception) # :nodoc:
  exception.is_a?(ActiveRecord::StatementInvalid) && exception.to_s.include?('duplicate key')
end

#insert_many(sql, values, options = {}, *args) ⇒ Object

:nodoc:



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
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 9

def insert_many( sql, values, options = {}, *args ) # :nodoc:
  number_of_inserts = 1
  returned_values = {}
  ids = []
  results = []

  base_sql, post_sql = if sql.is_a?( String )
    [sql, '']
  elsif sql.is_a?( Array )
    [sql.shift, sql.join( ' ' )]
  end

  sql2insert = base_sql + values.join( ',' ) + post_sql

  selections = returning_selections(options)
  if selections.blank? || (options[:no_returning] && !options[:recursive])
    insert( sql2insert, *args )
  else
    returned_values = if selections.size > 1
      # Select composite columns
      db_result = select_all( sql2insert, *args )
      { values: db_result.rows, columns: db_result.columns }
    else
      { values: select_values( sql2insert, *args ) }
    end
    clear_query_cache if query_cache_enabled
  end

  if options[:returning].blank?
    ids = Array(returned_values[:values])
  elsif options[:primary_key].blank?
    options[:returning_columns] ||= returned_values[:columns]
    results = Array(returned_values[:values])
  else
    # split primary key and returning columns
    ids, results, options[:returning_columns] = split_ids_and_results(returned_values, options)
  end

  ActiveRecord::Import::Result.new([], number_of_inserts, ids, results)
end

#next_value_for_sequence(sequence_name) ⇒ Object 



72
73
74
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 72

def next_value_for_sequence(sequence_name)
  %{nextval('#{sequence_name}')}
end

#post_sql_statements(table_name, options) ⇒ Object

:nodoc:



76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 76

def post_sql_statements( table_name, options ) # :nodoc:
  sql = []

  if supports_on_duplicate_key_update?
    # Options :recursive and :on_duplicate_key_ignore are mutually exclusive
    if (options[:ignore] || options[:on_duplicate_key_ignore]) && !options[:on_duplicate_key_update] && !options[:recursive]
      sql << sql_for_on_duplicate_key_ignore( table_name, options[:on_duplicate_key_ignore] )
    end
  elsif logger && options[:on_duplicate_key_ignore] && !options[:on_duplicate_key_update]
    logger.warn "Ignoring on_duplicate_key_ignore because it is not supported by the database."
  end

  sql += super(table_name, options)

  selections = returning_selections(options)
  unless selections.blank? || (options[:no_returning] && !options[:recursive])
    sql << " RETURNING #{selections.join(', ')}"
  end

  sql
end

#returning_selections(options) ⇒ Object 



98
99
100
101
102
103
104
105
106
107
108
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 98

def returning_selections(options)
  selections = []
  column_names = Array(options[:model].column_names)

  selections += Array(options[:primary_key]) if options[:primary_key].present?
  selections += Array(options[:returning]) if options[:returning].present?

  selections.map do |selection|
    column_names.include?(selection.to_s) ? "\"#{selection}\"" : selection
  end
end

#split_ids_and_results(selections, options) ⇒ Object 



50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 50

def split_ids_and_results( selections, options )
  ids = []
  returning_values = []

  columns = Array(selections[:columns])
  values = Array(selections[:values])
  id_indexes = Array(options[:primary_key]).map { |key| columns.index(key) }
  returning_columns = columns.reject.with_index { |_, index| id_indexes.include?(index) }
  returning_indexes = returning_columns.map { |column| columns.index(column) }

  values.each do |value|
    value_array = Array(value)
    ids << id_indexes.map { |index| value_array[index] }
    returning_values << returning_indexes.map { |index| value_array[index] }
  end

  ids.map!(&:first) if id_indexes.size == 1
  returning_values.map!(&:first) if returning_columns.size == 1

  [ids, returning_values, returning_columns]
end

#sql_for_conflict_target(args = {}) ⇒ Object 



188
189
190
191
192
193
194
195
196
197
198
199
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 188

def sql_for_conflict_target( args = {} )
  constraint_name = args[:constraint_name]
  conflict_target = args[:conflict_target]
  index_predicate = args[:index_predicate]
  if constraint_name.present?
    "ON CONSTRAINT #{constraint_name} "
  elsif conflict_target.present?
    sql = '(' + Array( conflict_target ).reject( &:blank? ).join( ', ' ) + ') '
    sql += "WHERE #{index_predicate} " if index_predicate
    sql
  end
end

#sql_for_default_conflict_target(table_name, primary_key) ⇒ Object 



201
202
203
204
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 201

def sql_for_default_conflict_target( table_name, primary_key )
  conflict_target = Array(primary_key).join(', ')
  "(#{conflict_target}) " if conflict_target.present?
end

#sql_for_on_duplicate_key_ignore(table_name, *args) ⇒ Object

Returns a generated ON CONFLICT DO NOTHING statement given the passed in args.



126
127
128
129
130
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 126

def sql_for_on_duplicate_key_ignore( table_name, *args ) # :nodoc:
  arg = args.first
  conflict_target = sql_for_conflict_target( arg ) if arg.is_a?( Hash )
  " ON CONFLICT #{conflict_target}DO NOTHING"
end

#sql_for_on_duplicate_key_update(table_name, *args) ⇒ Object

Returns a generated ON CONFLICT DO UPDATE statement given the passed in args.



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
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 134

def sql_for_on_duplicate_key_update( table_name, *args ) # :nodoc:
  arg, primary_key, locking_column = args
  arg = { columns: arg } if arg.is_a?( Array ) || arg.is_a?( String )
  return unless arg.is_a?( Hash )

  sql = ' ON CONFLICT '.dup
  conflict_target = sql_for_conflict_target( arg )

  columns = arg.fetch( :columns, [] )
  condition = arg[:condition]
  if columns.respond_to?( :empty? ) && columns.empty?
    return sql << "#{conflict_target}DO NOTHING"
  end

  conflict_target ||= sql_for_default_conflict_target( table_name, primary_key )
  unless conflict_target
    raise ArgumentError, 'Expected :conflict_target or :constraint_name to be specified'
  end

  sql << "#{conflict_target}DO UPDATE SET "
  if columns.is_a?( Array )
    sql << sql_for_on_duplicate_key_update_as_array( table_name, locking_column, columns )
  elsif columns.is_a?( Hash )
    sql << sql_for_on_duplicate_key_update_as_hash( table_name, locking_column, columns )
  elsif columns.is_a?( String )
    sql << columns
  else
    raise ArgumentError, 'Expected :columns to be an Array or Hash'
  end

  sql << " WHERE #{condition}" if condition.present?

  sql
end

#sql_for_on_duplicate_key_update_as_array(table_name, locking_column, arr) ⇒ Object

:nodoc:



169
170
171
172
173
174
175
176
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 169

def sql_for_on_duplicate_key_update_as_array( table_name, locking_column, arr ) # :nodoc:
  results = arr.map do |column|
    qc = quote_column_name( column )
    "#{qc}=EXCLUDED.#{qc}"
  end
  increment_locking_column!(table_name, results, locking_column)
  results.join( ',' )
end

#sql_for_on_duplicate_key_update_as_hash(table_name, locking_column, hsh) ⇒ Object

:nodoc:



178
179
180
181
182
183
184
185
186
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 178

def sql_for_on_duplicate_key_update_as_hash( table_name, locking_column, hsh ) # :nodoc:
  results = hsh.map do |column1, column2|
    qc1 = quote_column_name( column1 )
    qc2 = quote_column_name( column2 )
    "#{qc1}=EXCLUDED.#{qc2}"
  end
  increment_locking_column!(table_name, results, locking_column)
  results.join( ',' )
end

#supports_on_duplicate_key_update? ⇒ Boolean

Returns:

  • (Boolean) 


211
212
213
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 211

def supports_on_duplicate_key_update?
  database_version >= MIN_VERSION_FOR_UPSERT
end

#supports_setting_primary_key_of_imported_objects? ⇒ Boolean

Returns:

  • (Boolean) 


215
216
217
 
# File 'lib/activerecord-import/adapters/postgresql_adapter.rb', line 215

def supports_setting_primary_key_of_imported_objects?
  true
end