Module: DataMapper::Adapters::PostgresAdapter::Migration

Includes:
SQL
Included in:
DataMapper::Adapters::PostgresAdapter
Defined in:
lib/gems/dm-core-0.9.9/lib/dm-core/adapters/postgres_adapter.rb

Overview

TODO: move to dm-more/dm-migrations (if possible)

Defined Under Namespace

Modules: ClassMethods, SQL

Instance Method Summary collapse

Instance Method Details

#create_model_storage(repository, model) ⇒ Object

TODO: move to dm-more/dm-migrations



52
53
54
55
 
# File 'lib/gems/dm-core-0.9.9/lib/dm-core/adapters/postgres_adapter.rb', line 52

def create_model_storage(repository, model)
  add_sequences(repository, model)
  without_notices { super }
end

#destroy_model_storage(repository, model) ⇒ Object

TODO: move to dm-more/dm-migrations



58
59
60
61
62
63
64
65
 
# File 'lib/gems/dm-core-0.9.9/lib/dm-core/adapters/postgres_adapter.rb', line 58

def destroy_model_storage(repository, model)
  return true unless storage_exists?(model.storage_name(repository.name))
  success = without_notices { super }
  model.properties(repository.name).each do |property|
    drop_sequence(repository, property) if property.serial?
  end
  success
end

#field_exists?(storage_name, column_name) ⇒ Boolean

TODO: move to dm-more/dm-migrations (if possible)

Returns:



32
33
34
35
36
37
38
39
40
41
42
43
 
# File 'lib/gems/dm-core-0.9.9/lib/dm-core/adapters/postgres_adapter.rb', line 32

def field_exists?(storage_name, column_name)
  statement = "    SELECT COUNT(*)\n    FROM \"pg_class\"\n    JOIN \"pg_attribute\" ON \"pg_class\".\"oid\" = \"pg_attribute\".\"attrelid\"\n    WHERE \"pg_attribute\".\"attname\" = ?\n    AND \"pg_class\".\"relname\" = ?\n    AND \"pg_attribute\".\"attnum\" >= 0\n  EOS\n\n  query(statement, column_name, storage_name).first > 0\nend\n".compress_lines

#storage_exists?(storage_name) ⇒ Boolean

TODO: move to dm-more/dm-migrations (if possible)

Returns:



20
21
22
23
24
25
26
27
28
29
 
# File 'lib/gems/dm-core-0.9.9/lib/dm-core/adapters/postgres_adapter.rb', line 20

def storage_exists?(storage_name)
  statement = "    SELECT COUNT(*)\n    FROM \"information_schema\".\"columns\"\n    WHERE \"table_name\" = ?\n    AND \"table_schema\" = current_schema()\n  EOS\n\n  query(statement, storage_name).first > 0\nend\n".compress_lines

#upgrade_model_storage(repository, model) ⇒ Object

TODO: move to dm-more/dm-migrations



46
47
48
49
 
# File 'lib/gems/dm-core-0.9.9/lib/dm-core/adapters/postgres_adapter.rb', line 46

def upgrade_model_storage(repository, model)
  add_sequences(repository, model)
  super
end