TypeScript apollo-utilities.argumentsObjectFromField函數代碼示例

function executeField(
  field: FieldNode,
  rootValue: any,
  execContext: ExecContext,
): any {
  const { variableValues: variables, contextValue, resolver } = execContext;

  const fieldName = field.name.value;
  const args = argumentsObjectFromField(field, variables);

  const info: ExecInfo = {
    isLeaf: !field.selectionSet,
    resultKey: resultKeyNameFromField(field),
    directives: getDirectiveInfoFromField(field, variables),
    field,
  };

  const result = resolver(fieldName, rootValue, args, contextValue, info);

  // Handle all scalar types here
  if (!field.selectionSet) {
    return result;
  }

  // From here down, the field has a selection set, which means it's trying to
  // query a GraphQLObjectType
  if (result == null) {
    // Basically any field in a GraphQL response can be null, or missing
    return result;
  }

  if (Array.isArray(result)) {
    return executeSubSelectedArray(field, result, execContext);
  }

  // Returned value is an object, and the query has a sub-selection. Recurse.
  return executeSelectionSet(field.selectionSet, result, execContext);
}

  private executeField(
    object: StoreObject,
    typename: string | void,
    field: FieldNode,
    execContext: ExecContext,
  ): ExecResult {
    const { variableValues: variables, contextValue } = execContext;
    const fieldName = field.name.value;
    const args = argumentsObjectFromField(field, variables);

    const info: ExecInfo = {
      resultKey: resultKeyNameFromField(field),
      directives: getDirectiveInfoFromField(field, variables),
    };

    const readStoreResult = readStoreResolver(
      object,
      typename,
      fieldName,
      args,
      contextValue,
      info,
    );

    if (Array.isArray(readStoreResult.result)) {
      return this.combineExecResults(
        readStoreResult,
        this.executeSubSelectedArray(
          field,
          readStoreResult.result,
          execContext,
        ),
      );
    }

    // Handle all scalar types here
    if (!field.selectionSet) {
      assertSelectionSetForIdValue(field, readStoreResult.result);
      if (this.freezeResults && process.env.NODE_ENV !== 'production') {
        maybeDeepFreeze(readStoreResult);
      }
      return readStoreResult;
    }

    // From here down, the field has a selection set, which means it's trying to
    // query a GraphQLObjectType
    if (readStoreResult.result == null) {
      // Basically any field in a GraphQL response can be null, or missing
      return readStoreResult;
    }

    // Returned value is an object, and the query has a sub-selection. Recurse.
    return this.combineExecResults(
      readStoreResult,
      this.executeSelectionSet({
        selectionSet: field.selectionSet,
        rootValue: readStoreResult.result,
        execContext,
      }),
    );
  }

  private async resolveField(
    field: FieldNode,
    rootValue: any,
    execContext: ExecContext,
  ): Promise<any> {
    const { variables } = execContext;
    const fieldName = field.name.value;
    const aliasedFieldName = resultKeyNameFromField(field);
    const aliasUsed = fieldName !== aliasedFieldName;
    const defaultResult = rootValue[aliasedFieldName] || rootValue[fieldName];
    let resultPromise = Promise.resolve(defaultResult);

    // Usually all local resolvers are run when passing through here, but
    // if we've specifically identified that we only want to run forced
    // resolvers (that is, resolvers for fields marked with
    // `@client(always: true)`), then we'll skip running non-forced resolvers.
    if (
      !execContext.onlyRunForcedResolvers ||
      this.shouldForceResolver(field)
    ) {
      const resolverType =
        rootValue.__typename || execContext.defaultOperationType;
      const resolverMap = this.resolvers && this.resolvers[resolverType];
      if (resolverMap) {
        const resolve = resolverMap[aliasUsed ? fieldName : aliasedFieldName];
        if (resolve) {
          resultPromise = Promise.resolve(resolve(
            rootValue,
            argumentsObjectFromField(field, variables),
            execContext.context,
            { field },
          ));
        }
      }
    }

    return resultPromise.then((result = defaultResult) => {
      // If an @export directive is associated with the current field, store
      // the `as` export variable name and current result for later use.
      if (field.directives) {
        field.directives.forEach(directive => {
          if (directive.name.value === 'export' && directive.arguments) {
            directive.arguments.forEach(arg => {
              if (arg.name.value === 'as' && arg.value.kind === 'StringValue') {
                execContext.exportedVariables[arg.value.value] = result;
              }
            });
          }
        });
      }

      // Handle all scalar types here.
      if (!field.selectionSet) {
        return result;
      }

      // From here down, the field has a selection set, which means it's trying
      // to query a GraphQLObjectType.
      if (result == null) {
        // Basically any field in a GraphQL response can be null, or missing
        return result;
      }

      if (Array.isArray(result)) {
        return this.resolveSubSelectedArray(field, result, execContext);
      }

      // Returned value is an object, and the query has a sub-selection. Recurse.
      if (field.selectionSet) {
        return this.resolveSelectionSet(
          field.selectionSet,
          result,
          execContext,
        );
      }
    });
  }