# Inline fragments

GraphQL's permits [polymorphism](https://en.wikipedia.org/wiki/Polymorphism_\(computer_science\)) through [inline fragments](https://graphql.org/learn/queries/#inline-fragments), through objects being available as[ GraphQL Unions](https://graphql.org/learn/schema/#union-types) and [Interfaces](https://graphql.org/learn/schema/#interfaces). Eduflow uses inline fragments across the various [activity object types](/guides/flows-and-activities.md#activities).

Eduflow activities all have `Activity.title`, so all activities inherit from `ActivityInterface`.

### Querying

{% tabs %}
{% tab title="Query" %}

```graphql
{
  course(id: "00000000-5945-95c7-65fc-a9747b200320") {
    flows {
      activities {
        ... on ActivityInterface {
          title
        }
      }
    }
  }
}
```

{% endtab %}

{% tab title="Response" %}

```javascript
{
  "data": {
    "course": {
      "flows": [
        {
          "activities": [
            {
              "title": "Welcome to the root-level Activity"
            }
          ]
        },
        {
          "activities": [
            {
              "title": "Learn about paper"
            },
            {
              "title": "Environmental friendliness"
            },
            {
              "title": "Climate change"
            }
          ]
        },
        {
          "activities": [
            {
              "title": "Introduction to sales"
            },
            {
              "title": "CRM technology"
            },
            {
              "title": "Funnel configuration"
            }
          ]
        }
      ]
    }
  }
}
```

{% endtab %}
{% endtabs %}

### Inline fragments

Using specific activity fragments act as a way to [upcast ](https://en.wikipedia.org/wiki/Type_conversion)objects. Here's an example of `PeerReview` ran against the connection above, and via direct activity lookup.

{% tabs %}
{% tab title="Query (Connection)" %}

```graphql
{
  course(id: "00000000-5945-95c6-65fc-a9747b200320") {
    flows {
      activities {
        __typename
        ... on ActivityInterface {
          title
        }
        ... on PeerReviewActivity {
          reviews {
            edges {
              node {
                reviewType
                createdAt
              }
            }
          }
        }
      }
    }
  }
}
```

{% endtab %}

{% tab title="Response" %}
Notice the specialized fields only return for the activity type that are `PeerReview`s:

```javascript
{
  "data": {
    "course": {
      "flows": [
        {
          "activities": [
            {
              "__typename": "ContentActivity",
              "title": "Welcome aboard!"
            }
          ]
        },
        {
          "activities": [
            {
              "__typename": "ContentActivity",
              "title": "Our Mission"
            },
            {
              "__typename": "SubmissionActivity",
              "title": "Make an impact"
            },
            {
              "__typename": "PeerReviewActivity",
              "title": "Spot-check and team build",
              "reviews": {
                "edges": [
                  {
                    "node": {
                      "reviewType": "PeerReview",
                      "createdAt": "2021-02-08T17:56:30.576582"
                    }
                  },
                  {
                    "node": {
                      "reviewType": "PeerReview",
                      "createdAt": "2021-02-08T17:56:30.617394"
                    }
                  },
                  {
                    "node": {
                      "reviewType": "PeerReview",
                      "createdAt": "2021-02-08T17:56:30.661450"
                    }
                  },
                  {
                    "node": {
                      "reviewType": "PeerReview",
                      "createdAt": "2021-02-08T17:56:30.703841"
                    }
                  },
                  {
                    "node": {
                      "reviewType": "PeerReview",
                      "createdAt": "2021-02-08T17:56:32.501897"
                    }
                  }
                ]
              }
            },
            {
              "__typename": "FeedbackReflectionActivity",
              "title": "Introspect and reflect"
            },
            {
              "__typename": "TeacherReviewActivity",
              "title": "From your manager"
            },
            {
              "__typename": "SelfReviewActivity",
              "title": "How would you improve?"
            },
            {
              "__typename": "ContentActivity",
              "title": "Water cooler"
            },
            {
              "__typename": "ContentActivity",
              "title": "Networking: Meet across divisions"
            }
          ]
        },
        {
          "activities": [
            {
              "__typename": "ContentActivity",
              "title": "Paper: Relevant today?"
            },
            {
              "__typename": "SubmissionActivity",
              "title": "How do you use paper?"
            },
            {
              "__typename": "ContentActivity",
              "title": "Our philosophy"
            }
          ]
        }
      ]
    }
  }
}
```

{% endtab %}

{% tab title="Query (Direct lookup)" %}
`title` exists in `PeerReviewActivity` as well, no need to use `ActivityInterface`:

```graphql
{
  activity(id: "10aa7684-f0b2-4595-9161-4845e3602312") {
    ... on PeerReviewActivity {
      title
      reviews {
        edges {
          node {
            reviewType
            createdAt
          }
        }
      }
    }
  }
}
```

![title exists on PeerReviewActivity, as it inherits from ActivityInterface](/files/-MT16Ggg_C1Dyyudl0f1)
{% endtab %}

{% tab title="Response" %}

```javascript
{
  "data": {
    "activity": {
      "title": "Spot-check and team build",
      "reviews": {
        "edges": [
          {
            "node": {
              "reviewType": "PeerReview",
              "createdAt": "2021-02-08T17:56:30.576582"
            }
          },
          {
            "node": {
              "reviewType": "PeerReview",
              "createdAt": "2021-02-08T17:56:30.617394"
            }
          },
          {
            "node": {
              "reviewType": "PeerReview",
              "createdAt": "2021-02-08T17:56:30.661450"
            }
          },
          {
            "node": {
              "reviewType": "PeerReview",
              "createdAt": "2021-02-08T17:56:30.703841"
            }
          },
          {
            "node": {
              "reviewType": "PeerReview",
              "createdAt": "2021-02-08T17:56:32.501897"
            }
          }
        ]
      }
    }
  }
}
```

{% endtab %}
{% endtabs %}

### See also

* [Inline fragments](https://graphql.org/learn/queries/#inline-fragments) on graphql.org
* [Unions](https://graphql.org/learn/schema/#union-types) on on graphql.org
* [Interfaces](https://graphql.org/learn/schema/#interfaces) on graphql.org


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.eduflow.com/graphql/inline-fragments.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.