# How to configure Column Data Source

Select a column (click on its header). Go to "Data" section of column properties at the right sidebar and click on link "edit".

<img src="/files/gXsABNAogCDp9UOd3Eq1" alt="" class="gitbook-drawing">

Column Data Source config dialog popup will open. Select "Data Source Type":

<img src="/files/ueFjyd5r0IILoFKzQY4b" alt="" class="gitbook-drawing">

### SObject Data Source

"SObject" Data Source is preselected:

<img src="/files/r5GZ5GqSqy0GrCupUH8A" alt="" class="gitbook-drawing">

Select Data Source. When you select data source additional fields will be displayed:

* **"Order"** picklist contains fields of chosen data source object. This option helps you to sort cards in column.
* Check **"Ignore Permissions"** checkbox to show all cards in column (in spite of user's account permissions).
* **"Page Size"** is number of cards shown in a column by default and additionally loaded per each scroll (one page).
* **"Preload Pages"** is number of pages that are loaded by system automatically one by one. Loading progress will be indicated with a spinner around the badge showing number of cards:

<img src="/files/KdTG042sX4xYn3C5Su6l" alt="" class="gitbook-drawing">

{% hint style="success" %}
reload several pages with small number of cards per each can save server resources (Salesforce limits) and can be useful when internet connection is slow.
{% endhint %}

When you select data source additional tabs will be displayed:

* Conditions&#x20;
* Related Objects
* Push Topics

### Conditions

To configure condition for current column click "Add Condition". Row with new condition form will be shown. Click <img src="/files/1mCMaNBWkZuyNFfgwyYq" alt="" data-size="line"> button:

<img src="/files/Jh5PKiqoUPKmAkN8IFYb" alt="" class="gitbook-drawing">

Click <img src="/files/8Oh9X6w0H1ljylXb0fMH" alt="" data-size="line"> icon to open "Select Field" dialog popup. Choose field and click "Apply":

<img src="/files/ZPLFksDCIgApG7kKLJtL" alt="" class="gitbook-drawing">

After it you can select "Operator", "Type" and "Value" for condition. To copy, paste and apply conditions JSON click the proper button (for one condition, for all conditions).

<img src="/files/3XPvPfkekYhVrCVz1msx" alt="" class="gitbook-drawing">

<img src="/files/cVZRcULOt1v0v9c8K6M1" alt="" class="gitbook-drawing">

Configure "Logic" if needed:

<img src="/files/ZyIeGjF6i4CVtSQi6xKC" alt="" class="gitbook-drawing">

{% hint style="success" %}
Logic "All conditions combined with AND operators" will be applied by default if not configured.
{% endhint %}

### Related Objects

Configure [Related Objects](/standard-kanban/configure-column/how-to-work-with-related-objects.md) if necessary:

<img src="/files/3aboGaBAnbgzEBRJPdQU" alt="" class="gitbook-drawing">

### Apex Class Data Source

In some cases Apex Class should be required - e.g., when records from several objects need to be shown.

* Select "Apex Class" as Data source type
* Find necessary Apex Class in the proper lookup. Note, that your organization should have necessary Apex Classes deployed
* Set parameters for this class in JSON format

<img src="/files/m5SZwaQkXcqX39Yoas53" alt="" class="gitbook-drawing">

### Push Topics

{% hint style="info" %}
Push Topics allow system generate special push notifications when some fields in some object records are created and/or updated.

Push Topics are created globally, so, they can be subscribed by any other columns in any dashboard.

Push technology, also called the publish/subscribe model, transfers information that is initiated from a server to the client. It will help you to follow the changes in this column.
{% endhint %}

<img src="/files/eoWwLIrjlStKgFwHju65" alt="" class="gitbook-drawing">

**To create a Push topic** click "Create Push Topic" button and set Name, Query and necessary notifications:

<img src="/files/mq9OcF2xgKtI7DLSiwjR" alt="" class="gitbook-drawing">

* Query should be written in SOQL syntax. List fields which changes you want to subscribe to.
* Check proper checkboxes to push notifications on records creation and/or update.

**To subscribe to existing Push topic** click "Subscribe on Push Topic" button.

<img src="/files/jxtmJW2a2i0SOh6gb6tu" alt="" class="gitbook-drawing">

* Select Push Topic in lookup.
* Select "Source ID Field" from the  Push Topic source object, that represents the column source object record ID,
* choose  period "How to handle events",
* select behavior of "Card compact layout" and "Card Layout".

{% hint style="info" %}
Behavior of **Card Layout** can be:

* Hide - if any card layout has been opened, it will be closed
* Refresh - if any card layout has been opened, it will be refreshed
* Not selected - nothing will happen.
  {% endhint %}

{% hint style="warning" %}
Currently behavior of **Card Compact Layout** can be "Refresh" only.
{% endhint %}

As soon as a Push Topic is configured, the system starts evaluating record creates, updates, deletes, and undeletes for matches. Whenever there’s a match, a new notification is generated.


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