Add support for nested provider, field and jsonarray datasource types in new data fetch model

packages/client/src/utils/fetch/FieldFetch.js

@@ -0,0 +1,44 @@
+import DataFetch from "./DataFetch.js"
+
+export default class FieldFetch extends DataFetch {
+  static async getDefinition(datasource) {
+    // Field sources have their schema statically defined
+    let schema
+    if (datasource.fieldType === "attachment") {
+      schema = {
+        url: {
+          type: "string",
+        },
+        name: {
+          type: "string",
+        },
+      }
+    } else if (datasource.fieldType === "array") {
+      schema = {
+        value: {
+          type: "string",
+        },
+      }
+    }
+    return { schema }
+  }
+
+  async getData() {
+    const { datasource } = this.options
+
+    // These sources will be available directly from context
+    const data = datasource?.value || []
+    let rows = []
+    if (Array.isArray(data) && data[0] && typeof data[0] !== "object") {
+      rows = data.map(value => ({ value }))
+    } else {
+      rows = data
+    }
+
+    return {
+      rows: rows || [],
+      hasNextPage: false,
+      cursor: null,
+    }
+  }
+}

packages/client/src/utils/fetch/JSONArrayFetch.js

@@ -0,0 +1,13 @@
+import FieldFetch from "./FieldFetch.js"
+import { fetchTableDefinition } from "api"
+import { getJSONArrayDatasourceSchema } from "builder/src/builderStore/jsonUtils"
+
+export default class JSONArrayFetch extends FieldFetch {
+  static async getDefinition(datasource) {
+    // JSON arrays need their table definitions fetched.
+    // We can then extract their schema as a subset of the table schema.
+    const table = await fetchTableDefinition(datasource.tableId)
+    const schema = getJSONArrayDatasourceSchema(table?.schema, datasource)
+    return { schema }
+  }
+}

packages/client/src/utils/fetch/NestedProviderFetch.js

@@ -0,0 +1,20 @@
+import DataFetch from "./DataFetch.js"
+
+export default class NestedProviderFetch extends DataFetch {
+  static async getDefinition(datasource) {
+    // Nested providers should already have exposed their own schema
+    return {
+      schema: datasource?.value?.schema,
+    }
+  }
+
+  async getData() {
+    const { datasource } = this.options
+    // Pull the rows from the existing data provider
+    return {
+      rows: datasource?.value?.rows || [],
+      hasNextPage: false,
+      cursor: null,
+    }
+  }
+}

packages/client/src/utils/fetch/fetchData.js

@@ -2,12 +2,18 @@ import TableFetch from "./TableFetch.js"
 import ViewFetch from "./ViewFetch.js"
 import QueryFetch from "./QueryFetch.js"
 import RelationshipFetch from "./RelationshipFetch.js"
+import NestedProviderFetch from "./NestedProviderFetch.js"
+import FieldFetch from "./FieldFetch.js"
+import JSONArrayFetch from "./JSONArrayFetch.js"
 
 const DataFetchMap = {
   table: TableFetch,
   view: ViewFetch,
   query: QueryFetch,
   link: RelationshipFetch,
+  provider: NestedProviderFetch,
+  field: FieldFetch,
+  jsonarray: JSONArrayFetch,
 }
 
 export const fetchData = (datasource, options) => {

packages/client/src/utils/schema.js

@@ -1,66 +1,39 @@
-import {
-  convertJSONSchemaToTableSchema,
-  getJSONArrayDatasourceSchema,
-} from "builder/src/builderStore/jsonUtils"
-import { fetchTableDefinition } from "api"
+import { convertJSONSchemaToTableSchema } from "builder/src/builderStore/jsonUtils"
 import TableFetch from "./fetch/TableFetch.js"
 import ViewFetch from "./fetch/ViewFetch.js"
 import QueryFetch from "./fetch/QueryFetch.js"
+import RelationshipFetch from "./fetch/RelationshipFetch.js"
+import NestedProviderFetch from "./fetch/NestedProviderFetch.js"
+import FieldFetch from "./fetch/FieldFetch.js"
+import JSONArrayFetch from "./fetch/JSONArrayFetch.js"
 
 /**
  * Fetches the schema of any kind of datasource.
+ * All datasource fetch classes implement their own functionality to get the
+ * schema of a datasource of their respective types.
  */
 export const fetchDatasourceSchema = async datasource => {
-  const type = datasource?.type
-  let schema
-
-  // Nested providers should already have exposed their own schema
-  if (type === "provider") {
-    schema = datasource.value?.schema
-  }
-
-  // Field sources have their schema statically defined
-  if (type === "field") {
-    if (datasource.fieldType === "attachment") {
-      schema = {
-        url: {
-          type: "string",
-        },
-        name: {
-          type: "string",
-        },
-      }
-    } else if (datasource.fieldType === "array") {
-      schema = {
-        value: {
-          type: "string",
-        },
-      }
-    }
-  }
-
-  // JSON arrays need their table definitions fetched.
-  // We can then extract their schema as a subset of the table schema.
-  if (type === "jsonarray") {
-    const table = await fetchTableDefinition(datasource.tableId)
-    schema = getJSONArrayDatasourceSchema(table?.schema, datasource)
-  }
-
-  // All normal datasource schema can use their corresponding implementations
-  // in the data fetch classes
   const handler = {
     table: TableFetch,
-    link: TableFetch,
     view: ViewFetch,
     query: QueryFetch,
-  }[type]
-  if (handler) {
+    link: RelationshipFetch,
+    provider: NestedProviderFetch,
+    field: FieldFetch,
+    jsonarray: JSONArrayFetch,
+  }[datasource?.type]
+  if (!handler) {
+    return null
+  }
+
+  // Get the datasource definition and then schema
   const definition = await handler.getDefinition(datasource)
-    schema = handler.getSchema(datasource, definition)
+  const schema = handler.getSchema(datasource, definition)
+  if (!schema) {
+    return null
   }
 
   // Check for any JSON fields so we can add any top level properties
-  if (schema) {
   let jsonAdditions = {}
   Object.keys(schema).forEach(fieldKey => {
     const fieldSchema = schema[fieldKey]
@@ -78,6 +51,3 @@ export const fetchDatasourceSchema = async datasource => {
   })
   return { ...schema, ...jsonAdditions }
 }
-
-  return null
-}