Module: DynamicMigrations::Postgres::Server::Database::LoadedSchemasBuilder

Included in:
DynamicMigrations::Postgres::Server::Database
Defined in:
lib/dynamic_migrations/postgres/server/database/loaded_schemas_builder.rb

Defined Under Namespace

Classes: UnexpectedConstrintTypeError, UnexpectedTriggerSchema

Instance Method Summary collapse

Instance Method Details

#recursively_load_database_structure ⇒ Object

recursively process the database and build all the schemas, tables and columns



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# File 'lib/dynamic_migrations/postgres/server/database/loaded_schemas_builder.rb', line 16

def recursively_load_database_structure
  validations = fetch_validations

  structure = fetch_structure

  # add any schemas
  structure.each do |schema_name, schema_definition|
    add_loaded_schema schema_name
  end

  # add any enums (required for adding columns below)
  fetch_enums.each do |schema_name, schema_definition|
    schema_definition.each do |enum_name, enum_definition|
      loaded_schema(schema_name).add_enum enum_name, enum_definition[:values], description: enum_definition[:description]
    end
  end

  structure.each do |schema_name, schema_definition|
    # the schema was already added above
    schema = loaded_schema schema_name
    schema_validations = validations[schema_name]

    schema_definition[:tables].each do |table_name, table_definition|
      table = schema.add_table table_name, description: table_definition[:description]
      table_validations = schema_validations && schema_validations[table_name]

      # add each table column
      table_definition[:columns].each do |column_name, column_definition|
        if column_definition[:is_enum]
          data_type = column_definition[:data_type].to_s
          enum_full_name = column_definition[:is_array] ? data_type[0..-3] : data_type
          enum_schema, enum_name = enum_full_name.split(".")
          enum = table.schema.database.loaded_schema(enum_schema.to_sym).enum(enum_name.to_sym)
        else
          enum = nil
        end

        table.add_column column_name, column_definition[:data_type],
          null: column_definition[:null],
          default: column_definition[:default],
          description: column_definition[:description],
          interval_type: column_definition[:interval_type],
          enum: enum
      end

      # add any validations
      table_validations&.each do |validation_name, validation_definition|
        table.add_validation validation_name, validation_definition[:columns], validation_definition[:check_clause], description: validation_definition[:description], deferrable: validation_definition[:deferrable], initially_deferred: validation_definition[:initially_deferred]
      end
    end
  end

  # add any active extensions to the database
  fetch_extensions.each do |extension_name|
    add_loaded_extension extension_name
  end

  # now that the structure has been loaded, we can add keys (foreign
  # keys need to be added last, because they can depend on tables from
  # different schemas)
  fetch_keys_and_unique_constraints.each do |schema_name, schema_definition|
    schema_definition.each do |table_name, keys_and_unique_constraints|
      table = loaded_schema(schema_name).table(table_name)
      keys_and_unique_constraints.each do |constraint_type, constraint_definitions|
        constraint_definitions.each do |constraint_name, constraint_definition|
          case constraint_type
          when :primary_key
            table.add_primary_key constraint_name, constraint_definition[:column_names], description: constraint_definition[:description]

          when :foreign_key
            table.add_foreign_key_constraint constraint_name, constraint_definition[:column_names], constraint_definition[:foreign_schema_name], constraint_definition[:foreign_table_name], constraint_definition[:foreign_column_names], description: constraint_definition[:description], deferrable: constraint_definition[:deferrable], initially_deferred: constraint_definition[:initially_deferred], on_delete: constraint_definition[:on_delete], on_update: constraint_definition[:on_update]

          when :unique
            table.add_unique_constraint constraint_name, constraint_definition[:column_names], description: constraint_definition[:description], deferrable: constraint_definition[:deferrable], initially_deferred: constraint_definition[:initially_deferred]

          else
            raise UnexpectedConstrintTypeError, constraint_type
          end
        end
      end
    end
  end

  # add all functions and triggers (functions first, because the triggers are dependent on them)
  fetch_triggers_and_functions.each do |schema_name, schema_definition|
    schema_definition.each do |table_name, triggers|
      # the table that this trigger works on
      table = loaded_schema(schema_name).table(table_name)
      # all the triggers for this table
      triggers.each do |trigger_name, trigger_definition|
        # the trigger and function can be in different schemas
        function_schema = loaded_schema(trigger_definition[:function_schema])
        trigger_schema = loaded_schema(trigger_definition[:trigger_schema])

        if trigger_schema != table.schema
          raise UnexpectedTriggerSchema, "Trigger schema `#{trigger_schema.name}` does not match table schema `#{table.schema.name}`"
        end

        # if this function does not exist locally, then add it
        unless function_schema.has_function?(trigger_definition[:function_name])
          function_schema.add_function trigger_definition[:function_name], trigger_definition[:function_definition], description: trigger_definition[:function_description]
        end

        # get the function
        function = function_schema.function(trigger_definition[:function_name])

        # create the trigger
        table.add_trigger trigger_name, action_timing: trigger_definition[:action_timing],
          event_manipulation: trigger_definition[:event_manipulation],
          action_order: trigger_definition[:action_order],
          parameters: trigger_definition[:parameters],
          action_orientation: trigger_definition[:action_orientation],
          function: function,
          action_condition: trigger_definition[:action_condition],
          action_reference_old_table: trigger_definition[:action_reference_old_table],
          action_reference_new_table: trigger_definition[:action_reference_new_table],
          description: trigger_definition[:description]
      end
    end
  end
end