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查询插件数据
查询插件数据Meta Box

Meta Box

与 Meta Box 插件数据进行交互的 Query 示例。

获取 Meta Box 自定义字段

我们可以使用元字段来查询 Meta Box 自定义字段的数据，无论其类型如何：

query GetPost($postId: ID!) {
  post(by: { id: $postId }) {
    id
    title
 
    text: metaValue(key: "text_field")
    textarea: metaValue(key: "textarea_field")
    select: metaValue(key: "select_field")
    multiSelect: metaValues(key: "multi_select_field")
  }
}

如果元值是一种关联关系（例如：文章、用户、分类法等），我们可以使用该值来查询对应的 Post、User、Taxonomy 等类型的实体：

query GetPostWithRelationships($postId: ID!) {
  post(by: { id: $postId }) {
    id
    title
    
    # Export the relationship to a post
    relationshipPostId: metaValue(key: "relationship_post_id")
      @export(as: "relationshipPostId")
 
    # Export the relationship to a list of posts
    relationshipPostIds: metaValues(key: "relationship_post_ids")
      @export(as: "relationshipPostIds")
  }
}
 
query QueryPostRelationships @depends(on: "GetPostWithRelationships") {  
  # Query the relationship to a post
  relationshipPost: post(by: { id: $relationshipPostId }) {
    id
    title
  }
 
  # Query the relationship to a list of posts
  relationshipPosts: posts(filter: { ids: $relationshipPostIds }) {
    id
    title
  }
}

更新 Meta Box 自定义字段

我们可以使用元变更来更新 Meta Box 自定义字段的数据，通过传入字段名称和值，无论其类型如何：

mutation UpdatePost($postId: ID!) {
  updatePost(
    input: {
      id: $postId
      meta: {
        text_field: ["New text value"],
        textarea_field: ["New textarea value"],
        select_field: ["New select value"],
        multi_select_field: ["Choice 1", "Choice 2"],
      }
    }
  ) {
    status
    errors {
      __typename
      ...on ErrorPayload {
        message
      }
    }
    post {
      id
      text: metaValue(key: "text_field")
      textarea: metaValue(key: "textarea_field")
      select: metaValue(key: "select_field")
      multiSelect: metaValues(key: "multi_select_field")
    }
  }
}