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

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

Instance Method Summary collapse

Instance Method Details

#process_index(schema_name, table_name, index_name, configuration_index, database_index) ⇒ Object 



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

def process_index schema_name, table_name, index_name, configuration_index, database_index
  # If the index exists in the configuration but not in the database
  # then we have to create it.
  if configuration_index[:exists] == true && !database_index[:exists]
    log.info "    Index `#{index_name}` exists in configuration but not in the database"

    # a migration to create the index
    index = @database.configured_schema(schema_name).table(table_name).index(index_name)
    @generator.add_index index

  # If the schema exists in the database but not in the configuration
  # then we need to delete it.
  elsif database_index[:exists] == true && !configuration_index[:exists]
    log.info "    Index `#{index_name}` exists in database but not in the configuration"

    # a migration to create the index
    index = @database.loaded_schema(schema_name).table(table_name).index(index_name)
    @generator.remove_index index

  # If the index 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_index.except(:exists, :description).filter { |name, attributes| attributes[:matches] == false }.any?
    log.info "    Index `#{index_name}` exists in both configuration and the database"

    log.info "      Index `#{index_name}` is different"
    # rebild the index
    original_index = @database.loaded_schema(schema_name).table(table_name).index(index_name)
    updated_index = @database.configured_schema(schema_name).table(table_name).index(index_name)
    @generator.recreate_index original_index, updated_index
    # does the description also need to be updated
    if configuration_index[:description][:matches] == false
      # if the description was removed
      if configuration_index[:description].nil?
        log.info "      Index `#{index_name}` description exists in database but not in the configuration"
        @generator.remove_index_comment updated_index
      else
        log.info "      Index `#{index_name}` does not match"
        @generator.set_index_comment updated_index
      end
    end

  # If the index exists in both the configuration and database representations
  # but the description is different then we need to update the description.
  elsif configuration_index[:description][:matches] == false
    log.info "    Index `#{index_name}` exists in both configuration and the database"

    index = @database.configured_schema(schema_name).table(table_name).index(index_name)
    # if the description was removed
    if configuration_index[:description].nil?
      log.info "      Index `#{index_name}` description exists in database but not in the configuration"
      @generator.remove_index_comment index
    else
      log.info "      Index `#{index_name}` description does not match"
      @generator.set_index_comment index
    end
  end
end

#process_indexes(schema_name, table_name, configuration_indexes, database_indexes) ⇒ Object 



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# File 'lib/dynamic_migrations/postgres/server/database/differences/to_migrations/schemas/tables/indexes.rb', line 12

def process_indexes schema_name, table_name, configuration_indexes, database_indexes
  # process all the indexes
  log.info "    Processing Indexes..."
  index_names = (configuration_indexes.keys + database_indexes.keys).uniq
  index_names.each do |index_name|
    log.info "    Processing Index #{index_name}..."
    process_index schema_name, table_name, index_name, configuration_indexes[index_name] || {}, database_indexes[index_name] || {}
  end
end