Module: DynamicMigrations::Postgres::Server::Database::Differences::ToMigrations::Schemas::Tables::Columns

Included in:
DynamicMigrations::Postgres::Server::Database::Differences::ToMigrations
Defined in:
lib/dynamic_migrations/postgres/server/database/differences/to_migrations/schemas/tables/columns.rb

Instance Method Summary collapse

Instance Method Details

#process_column(schema_name, table_name, column_name, configuration_column, database_column) ⇒ Object 



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
 
# File 'lib/dynamic_migrations/postgres/server/database/differences/to_migrations/schemas/tables/columns.rb', line 22

def process_column schema_name, table_name, column_name, configuration_column, database_column
  # If the column exists in the configuration but not in the database
  # then we have to create it.
  if configuration_column[:exists] == true && !database_column[:exists]
    log.debug "    Column `#{column_name}` exists in configuration but not in the database"

    # a migration to create the column
    column = @database.configured_schema(schema_name).table(table_name).column(column_name)
    @generator.add_column column

  # If the schema exists in the database but not in the configuration
  # then we need to delete it.
  elsif database_column[:exists] == true && !configuration_column[:exists]
    log.debug "    Column `#{column_name}` exists in database but not in the configuration"

    # a migration to create the column
    column = @database.loaded_schema(schema_name).table(table_name).column(column_name)
    @generator.remove_column column

  # If the column exists in both the configuration and database representations
  # but the definition (except description, which is handled seeprately below) is different
  # then we need to update the definition.
  elsif configuration_column.except(:exists, :description).filter { |name, attributes| attributes[:matches] == false }.any?
    log.debug "    Column `#{column_name}` exists in both configuration and the database"

    log.debug "      Column `#{column_name}` is different"
    # update the column
    column = @database.configured_schema(schema_name).table(table_name).column(column_name)
    @generator.change_column column
    # does the description also need to be updated
    if configuration_column[:description][:matches] == false
      # if the description was removed
      if configuration_column[:description].nil?
        log.debug "      Column `#{column_name}` description exists in database but not in the configuration"
        @generator.remove_column_comment column
      else
        log.debug "      Column `#{column_name}` description does not match"
        @generator.set_column_comment column
      end
    end

  # If the column exists in both the configuration and database representations
  # but the description is different then we need to update the description.
  elsif configuration_column[:description][:matches] == false
    log.debug "    Column `#{column_name}` exists in both configuration and the database"

    column = @database.configured_schema(schema_name).table(table_name).column(column_name)
    # if the description was removed
    if configuration_column[:description].nil?
      log.debug "      Column `#{column_name}` description exists in database but not in the configuration"
      @generator.remove_column_comment column
    else
      log.debug "      Column `#{column_name}` description does not match"
      @generator.set_column_comment column
    end
  end
end

#process_columns(schema_name, table_name, configuration_columns, database_columns) ⇒ Object 



12
13
14
15
16
17
18
19
20
 
# File 'lib/dynamic_migrations/postgres/server/database/differences/to_migrations/schemas/tables/columns.rb', line 12

def process_columns schema_name, table_name, configuration_columns, database_columns
  # process all the columns
  log.debug "    Processing Columns"
  column_names = (configuration_columns.keys + database_columns.keys).uniq
  column_names.each do |column_name|
    log.debug "    Processing Column #{column_name}"
    process_column schema_name, table_name, column_name, configuration_columns[column_name] || {}, database_columns[column_name] || {}
  end
end