graphql where子句：Apollo客户端

使用角度阿波罗客户端

我想用where子句

getPage(slug: string) {
    return this.apollo
      .query({
        variables: {
          slug: slug
        },
        query: gql`
          query pages(where: { $slug: slug }) {
            pages (slug: $slug) {
              slug,
              title,
              content,
              cover {
                name,
                url,
              },
              createdAt,
              updatedAt
            }
          }
        `
      });
  }

我在浏览器控制台中遇到此错误：

---

消息：“语法错误：应为$，找到名称“where”“

好的，我找到了

getPage(slug: string) {
    return this.apollo
      .query({
        variables: {
          slug: slug
        },
        query: gql`
          query pages ($slug: String) {
            pages (where: { slug: $slug }) {
              slug,
              title,
              content,
              cover {
                name,
                url,
              },
              createdAt,
              updatedAt
            }
          }
        `
      });
  }