Resource Metadata

You can use GoogleAdsFieldService to dynamically request the catalog for resources, resource's fields, segmentation keys and metrics available in the GoogleAdsService.Search interface. The catalog provides metadata that can be used by Google Ads API clients for validation and construction of Google Ads Query Language statements.

Sample HTTP request and response

The request consists of an HTTP GET to the Google Ads API server at the following URL:

https://googleads.googleapis.com/v1/googleAdsFields/{resource_or_field}

The following is an example of a request followed by the response returned from GoogleAdsFieldService for ad_group resource:

Request

https://googleads.googleapis.com/v1/googleAdsFields/ad_group

Response

{
  "resourceName": "googleAdsFields/ad_group",
  "name": "ad_group",
  "category": "RESOURCE",
  "selectable": false,
  "filterable": false,
  "sortable": false,
  "selectableWith": [
    "campaign",
    "customer",
    "metrics.average_cpc",
    "segments.device",
    ...
  ],
  "attributeResources": [
    "customer",
    "campaign"
  ],

  "metrics": [
    "metrics.conversions",
    "metrics.search_budget_lost_impression_share",
    "metrics.average_cost",
    "metrics.clicks",
    ...
  ],
  "segments": [
    "segments.date",
    "segments.ad_network_type",
    "segments.device",
    ...
  ]
}

For this example, the important arrays are:

attributeResources
Resources that can be implicitly joined to the resource in the FROM clause.
metrics
Metrics that are available to be selected with the resource in the FROM clause. Only populated for fields where the category is RESOURCE.
segments
Segment keys that can be selected with the resource in the FROM clause. These segment the metrics specified in the query. Only populated for fields where the category is RESOURCE.
selectableWith
Fields that can be selected alongside a given field, when not in the FROM clause. This attribute is only relevant when identifying resources or segments that are able to be selected in a query where they are not included by the resource in the FROM clause. As an example, if we are selecting ad_group.id and segments.date from ad_group, and we want to include attributes from campaign, we would need to check that segments.date is in the selectableWith attribute for campaign, since it's being selected alongside the existing segments.date field.

Metadata details

You can request the catalog via GoogleAdsFieldService at these levels:

Resource
For example, googleAdsFields/campaign.
Resource's field
For example, googleAdsFields/campaign.name.
Segmentation field
For example, googleAdsFields/segments.ad_network_type.
Metric
For example, googleAdsFields/metrics.clicks.

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