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

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

Instance Method Summary collapse

Instance Method Details

#process_unique_constraint(schema_name, table_name, unique_constraint_name, configuration_unique_constraint, database_unique_constraint) ⇒ Object 



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

def process_unique_constraint schema_name, table_name, unique_constraint_name, configuration_unique_constraint, database_unique_constraint
  # If the unique_constraint exists in the configuration but not in the database
  # then we have to create it.
  if configuration_unique_constraint[:exists] == true && !database_unique_constraint[:exists]
    log.debug "    Unique Constraint `#{unique_constraint_name}` exists in configuration but not in the database"

    # a migration to create the unique_constraint
    unique_constraint = @database.configured_schema(schema_name).table(table_name).unique_constraint(unique_constraint_name)
    @generator.add_unique_constraint unique_constraint

  # If the schema exists in the database but not in the configuration
  # then we need to delete it.
  elsif database_unique_constraint[:exists] == true && !configuration_unique_constraint[:exists]
    log.debug "    Unique Constraint `#{unique_constraint_name}` exists in database but not in the configuration"

    # a migration to create the unique_constraint
    unique_constraint = @database.loaded_schema(schema_name).table(table_name).unique_constraint(unique_constraint_name)
    @generator.remove_unique_constraint unique_constraint

  # If the unique_constraint 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_unique_constraint.except(:exists, :description).filter { |name, attributes| attributes[:matches] == false }.any?
    log.debug "    Unique Constraint `#{unique_constraint_name}` exists in both configuration and the database"

    log.debug "      Unique Constraint `#{unique_constraint_name}` is different"
    # recreate the unique_constraint
    original_unique_constraint = @database.loaded_schema(schema_name).table(table_name).unique_constraint(unique_constraint_name)
    updated_unique_constraint = @database.configured_schema(schema_name).table(table_name).unique_constraint(unique_constraint_name)
    @generator.recreate_unique_constraint original_unique_constraint, updated_unique_constraint
    # does the description also need to be updated
    if configuration_unique_constraint[:description][:matches] == false
      # if the description was removed
      if configuration_unique_constraint[:description].nil?
        log.debug "      Unique Constraint `#{unique_constraint_name}` description exists in database but not in the configuration"
        @generator.remove_unique_constraint_comment updated_unique_constraint
      else
        log.debug "      Unique Constraint `#{unique_constraint_name}` description does not match"
        @generator.set_unique_constraint_comment updated_unique_constraint
      end
    end

  # If the unique_constraint exists in both the configuration and database representations
  # but the description is different then we need to update the description.
  elsif configuration_unique_constraint[:description][:matches] == false
    log.debug "    Unique Constraint `#{unique_constraint_name}` exists in both configuration and the database"

    unique_constraint = @database.configured_schema(schema_name).table(table_name).unique_constraint(unique_constraint_name)
    # if the description was removed
    if configuration_unique_constraint[:description].nil?
      log.debug "      Unique Constraint `#{unique_constraint_name}` description exists in database but not in the configuration"
      @generator.remove_unique_constraint_comment unique_constraint
    else
      log.debug "      Unique Constraint `#{unique_constraint_name}` description does not match"
      @generator.set_unique_constraint_comment unique_constraint
    end
  end
end

#process_unique_constraints(schema_name, table_name, configuration_unique_constraints, database_unique_constraints) ⇒ Object 



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

def process_unique_constraints schema_name, table_name, configuration_unique_constraints, database_unique_constraints
  log.debug "    Processing Unique Constraints"
  # process all the unique_constraints
  unique_constraint_names = (configuration_unique_constraints.keys + database_unique_constraints.keys).uniq
  unique_constraint_names.each do |unique_constraint_name|
    log.debug "    Processing Unique Constraint #{unique_constraint_name}"
    process_unique_constraint schema_name, table_name, unique_constraint_name, configuration_unique_constraints[unique_constraint_name] || {}, database_unique_constraints[unique_constraint_name] || {}
  end
end