GraphiQL返回nil變異

Question

我正在使用GraphQL和Sequelize，並且我有一個返回null的變異。

我試過用不同的幾種方法改變有關突變的解析器，但是當我用GraphiQL對它進行測試時，它總是返回null。

繼承人寫在幾個不同的方式解析：

1 - 起初，我有想法，添加保鮮功能的承諾。

resolve(root, args) { 
     return new Promise((resolve, reject) => { 
      db.record.findOne({ where: { UID: args.UID } }) 
       .then(record => { 
        let newArr = undefined 
        if (record.watched == null) { 
         newArr = [args.value] 
        } else { 
         let old = record.watched 
         newArr = old.concat([args.value]) 
        } 
        db.record.update({ watched: newArr }, { where: { UID: args.UID } }) 
         .then(record => { 
          resolve(record) 
         }) 
       }) 
     }) 
    } 

2 - 在這裏，我回復了一個承諾。

resolve(root, args) { 
     db.record.findOne({ where: { UID: args.UID } }) 
      .then(record => { 
       let newArr = undefined 
       if (record.watched == null) { 
        newArr = [args.value] 
       } else { 
        let old = record.watched 
        newArr = old.concat([args.value]) 
       } 
       return db.record.update({ watched: newArr }, { where: { UID: args.UID } }) 
      }) 
    } 

3 - 下面我剛剛直接返回記錄。

resolve(root, args) { 
     db.record.findOne({ where: { UID: args.UID } }) 
      .then(record => { 
       let newArr = undefined 
       if (record.watched == null) { 
        newArr = [args.value] 
       } else { 
        let old = record.watched 
        newArr = old.concat([args.value]) 
       } 
       db.record.update({ watched: newArr }, { where: { UID: args.UID } }) 
        .then(record => { 
         return record 
        }) 
      }) 
    } 

Answer 1

問題是您沒有從您的解析器返回任何東西，並且您沒有正確使用承諾。請嘗試：

resolve(root, args) { 
    return db.record.findOne({ where: { UID: args.UID } }) 
     .then(record => { 
      let newArr = undefined 
      if (record.watched == null) { 
       newArr = [args.value] 
      } else { 
       let old = record.watched 
       newArr = old.concat([args.value]) 
      } 
      return db.record.update({ watched: newArr }, { where: { UID: args.UID } }); 
     }); 
}