budibase/packages/frontend-core/src/fetch/QueryArrayFetch.ts

import FieldFetch from "./FieldFetch"
import {
  getJSONArrayDatasourceSchema,
  generateQueryArraySchemas,
} from "../utils/json"
import { QueryArrayFieldDatasource } from "@budibase/types"

export default class QueryArrayFetch extends FieldFetch<QueryArrayFieldDatasource> {
  async getDefinition() {
    const { datasource } = this.options

    if (!datasource?.tableId) {
      return null
    }
    // JSON arrays need their table definitions fetched.
    // We can then extract their schema as a subset of the table schema.
    try {
      const table = await this.API.fetchQueryDefinition(datasource.tableId)
      const schema = generateQueryArraySchemas(
        table.schema,
        table.nestedSchemaFields
      )
      const result = {
        schema: getJSONArrayDatasourceSchema(schema, datasource),
      }

      return result
    } catch (error) {
      return null
    }
  }
}