Module: Code0::ZeroTrack::Database::MigrationHelpers::TablePartitioning

Included in:
Code0::ZeroTrack::Database::Migration::V1_0
Defined in:
lib/code0/zero_track/database/migration_helpers/table_partitioning.rb

Instance Method Summary collapse

Instance Method Details

#create_dynamic_partition_schema ⇒ Object 



30
31
32
33
 
# File 'lib/code0/zero_track/database/migration_helpers/table_partitioning.rb', line 30

def create_dynamic_partition_schema
  schema = quote_table_name(Rails.application.config.zero_track.db_partitioning.dynamic_partition_schema)
  execute "CREATE SCHEMA #{schema}"
end

#create_partition_by_date_table(table_name, partition_column:, primary_key: nil, **options, &block) ⇒ Object 



8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
 
# File 'lib/code0/zero_track/database/migration_helpers/table_partitioning.rb', line 8

def create_partition_by_date_table(table_name, partition_column:, primary_key: nil, **options, &block)
  options[:options] = "PARTITION BY RANGE (#{quote_column_name(partition_column)})"
  options[:id] = false

  create_table(table_name, **options) do |t|
    t.bigserial :id, null: false unless primary_key

    block.call(t)
  end

  pk_columns = primary_key || [:id, partition_column]

  reversible do |dir|
    dir.up do
      execute <<~SQL.squish
        ALTER TABLE #{quote_table_name(table_name)}
        ADD PRIMARY KEY (#{pk_columns.map { |c| quote_column_name(c) }.join(', ')})
      SQL
    end
  end
end

#create_partitioning_views ⇒ Object 



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
 
# File 'lib/code0/zero_track/database/migration_helpers/table_partitioning.rb', line 40

def create_partitioning_views
  dynamic_schema = Rails.application.config.zero_track.db_partitioning.dynamic_partition_schema

  execute <<-SQL.squish
    CREATE OR REPLACE VIEW postgres_partitioned_tables AS
    SELECT c.oid::regclass::text AS identifier,
           c.oid,
           n.nspname AS schema,
           c.relname AS name,
           CASE p.partstrat
             WHEN 'l' THEN 'list'
             WHEN 'r' THEN 'range'
             WHEN 'h' THEN 'hash'
           END AS strategy,
           pg_get_partkeydef(c.oid) AS partition_key
    FROM pg_partitioned_table p
    JOIN pg_class c ON c.oid = p.partrelid
    JOIN pg_namespace n ON n.oid = c.relnamespace
    WHERE n.nspname = current_schema();
  SQL

  execute <<-SQL.squish
    CREATE OR REPLACE VIEW postgres_partitions AS
    SELECT c.oid::regclass::text AS identifier,
           c.oid,
           n.nspname AS schema,
           c.relname AS name,
           i.inhparent::regclass::text AS parent_identifier,
           pg_get_expr(c.relpartbound, c.oid) AS condition,
           obj_description(c.oid) AS comment,
           i.inhrelid IS NOT NULL AS attached
    FROM pg_class c
    LEFT JOIN pg_inherits i ON c.oid = i.inhrelid
    JOIN pg_namespace n ON n.oid = c.relnamespace
    WHERE c.relispartition
      AND c.relkind = 'r'
      AND n.nspname IN (current_schema(), #{quote(dynamic_schema)});
  SQL

  execute <<-SQL.squish
    CREATE OR REPLACE VIEW postgres_detached_partitions AS
    SELECT c.oid::regclass::text AS identifier,
           c.oid,
           n.nspname AS schema,
           c.relname AS name,
           obj_description(c.oid)::jsonb ->> 'table' AS parent_identifier,
           (obj_description(c.oid)::jsonb ->> 'detached_at')::timestamptz AS detached_at
    FROM pg_class c
    JOIN pg_namespace n ON n.oid = c.relnamespace
    WHERE c.relkind = 'r'
      AND n.nspname = #{quote(dynamic_schema)}
      AND NOT EXISTS (
        SELECT 1 FROM pg_inherits WHERE inhrelid = c.oid
      )
      AND obj_description(c.oid)::jsonb ? 'table'
      AND obj_description(c.oid)::jsonb ? 'detached_at';
  SQL
end

#drop_dynamic_partition_schema ⇒ Object 



35
36
37
38
 
# File 'lib/code0/zero_track/database/migration_helpers/table_partitioning.rb', line 35

def drop_dynamic_partition_schema
  schema = quote_table_name(Rails.application.config.zero_track.db_partitioning.dynamic_partition_schema)
  execute "DROP SCHEMA #{schema}"
end

#drop_partitioning_views ⇒ Object 



99
100
101
102
103
 
# File 'lib/code0/zero_track/database/migration_helpers/table_partitioning.rb', line 99

def drop_partitioning_views
  execute 'DROP VIEW IF EXISTS postgres_detached_partitions'
  execute 'DROP VIEW IF EXISTS postgres_partitions'
  execute 'DROP VIEW IF EXISTS postgres_partitioned_tables'
end