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Pagination, sorting and filtering

Pagination

When you make an API request on an endpoint, you usually don't receive all of the results of that request in a single response. This is because some responses could contain thousands of objects so most responses are paginated by default.

Number of results

For each "list" endpoint, the Critizr API sends 20 items.

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page_size

The pagination is configurable using the "page_size" parameter for up to 1000 results.

Cursor-based Pagination

Cursor-based pagination is the most efficient method of paging and should always be used where possible. A cursor refers to a random string of characters which marks a specific item in a list of data. Unless this item is deleted, the cursor will always point to the same part of the list, but will be invalidated if an item is removed. Therefore, your app shouldn't store cursors and assume that they will be valid in the future.

When reading an endpoint that supports cursor pagination, you will see the following JSON response:

{
    "next": "https://api.critizr.com/v2/{endpoint}?cursor=cD0yMDE4LTEyLTExKzA4JTNBMTAlM0E1My40ODE1NTclMkIwMCUzQTAw",
    "previous": "https://api.critizr.com/v2/{endpoint}?cursor=cD0yMDE4LTEyLTExKzExJTNBMDAlM0ExNy42NjYwNTYlMkIwMCUzQTAwJnI9MQ%3D%3D",
    "results": [
        ... actual data here
    ]
}

Each list request will respond with these 3 fields :

  • results
  • next
  • previous

Results

The field results contains the actual data sent by the endpoint. It is an array of object. The schema of each object is specific of each endpoint and will be available in the API Reference.

Next

This field contains a url that will return the next page of data.
This field might contain null. In this case, this is the last page of data and you can stop paging.

Previous

This field contains a url that will return the previous page of data.
This field might contain null. In this case, this is the first page of data.

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Cursors consistency

Don't store cursors. Cursors can quickly become invalid if items are added or deleted.

Sorting

By default search results are sorted by the best match available. You can change this to a specific field using the sort parameter.
You can choose any of the fields' item to sort on. Refer to the API Reference for the resources' schema for each endpoint.

Example

When you send a request to the Response API, you obtain a response like described below :

{
    "next": "https://api.critizr.com/v2/responses?cursor=bz0yMA%3D%3D&sort=answers_count",
    "previous": null,
    "results": [
        {
            "id": "{response-id}",
            "created_date": "2019-03-22T15:02:32.664353+01:00",
            "updated_date": "2019-03-22T15:02:32.664383+01:00",
            "has_answers": true,
            "has_message": false,
            "detail_url": "http://critizr.com/api/v2/responses/{response-id}"
        },
        {
            "id": "{response-id}",
            "created_date": "2019-03-22T15:00:11.357434+01:00",
            "updated_date": "2019-03-22T15:00:11.800730+01:00",
            "has_answers": true,
            "has_message": true,
            "detail_url": "http://critizr.com/api/v2/responses/{response-id}"
        },
        ...
    ]
}

Since each field can be used to sort the results, you can use the following fields :

  • id
  • created_date
  • updated_date
  • has_answers
  • has_message
  • detail_url

If you want to sort the results by created_date, you simply have to add sort=created_date in the GET parameters of your query.

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Sort order

For now, the Critizr API only allows ascending sorts.

Filtering

When you retrieve a list of resources, it could be pretty useful to only get the results you really want!
This is where the filters come in handy!
For every GETrequest that will respond with a list, filters will be available. The details of these filters is available in the API Reference.

Example

When you are retrieving a list of solicitations, you may want to only get the one related to a particular place. In this case, you can use the place filter.
The request should look like this :

curl -X GET \
  'https://api.critizr.com/v2/solicitations?place={place-id}' \
  -H 'Authorization: {token}' \
  -H 'Content-Type: application/json' \

With this request, you only get the solicitations related to the place you enter as a parameter.

Updated 6 months ago



Pagination, sorting and filtering


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