DataEntity - reason for clearing out isFieldSet

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Posted on by ShawnDEV

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Hi All,

As far as I am concerned, 'isFieldSet' method of a data entity is to check to see if the field is returned by the connector.

* If the field specified by field_name is returned by the Connector, returns a Boolean True.
* If the field specified by field_name is not returned by the Connector, returns a Boolean False.

In some of methods in data entities, it is trying to clear out 'isFieldSet' method like below example.

What is the detailed reason for this?

public void initializeEntityDataSource(DataEntityRuntimeContext _entityCtx, DataEntityDataSourceRuntimeContext _dataSourceCtx)
{
    super(_entityCtx, _dataSourceCtx);

    switch (_dataSourceCtx.name())
    {
        case dataEntityDataSourceStr(PurchPurchaseOrderHeaderV2Entity, PurchTable):
            // clear out 'isFieldSet' so the defaulting logic does not consider fields that were set by initValue as specified by the user
            _dataSourceCtx.setAllFieldStatesToNotSet();
            break;
    }
}

/// 
/// Sets field state for all fields to the "Not set" value.
/// 
/// The data source context.
public static void setAllFieldStatesToNotSet(DataEntityDataSourceRuntimeContext _dataSourceCtx)
{
    _dataSourceCtx.setFieldStateForAllFields(FieldState::NotSet);
}

Thank you.

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nmaenpaa 101,160 Moderator on at

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My understanding of "isFieldSet" is that it's used in data import to determine whether a field value was provided. Not sure if it's also provided in the export.

It seems that the code comment in line 8 explains why it's used in your particular example.

docs.microsoft.com/.../system-tables

"isFieldSet Checks whether a field has a Set or Defaulted state."

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ShawnDEV 678 on at

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Hi Do you mean that isFieldSet is used in data import scenarios only? not in OData secenario?

public void defaultField(FieldId _fieldId) { super(_fieldId); switch (_fieldId) { case fieldNum(InventInventoryTagCountingJournalLineEntity, InventorySiteId): if (this.isFieldSet(fieldNum(InventInventoryTagCountingJournalLineEntity, WarehouseId))) { this.InventorySiteId = InventLocation::find(this.WarehouseId).InventSiteId; } break; } }

Thank you.

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nmaenpaa 101,160 Moderator on at

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You could debug OData export and find out. Please share your findings with us. Thanks!

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Martin Dráb 237,880 Most Valuable Professional on at

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The logic should be the same in both data management and OData.

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ShawnDEV 678 on at

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Hi all,

Going back to the basic, the base Enum FieldState can have three literals: NotSet,Set and Defaulted.

What does it mean that field state is set, NotSet or Defaulted. Any specific example to understand this concept?

Thank you.

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Martin Dráb 237,880 Most Valuable Professional on at

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Set - set explicitly

Defaulted - set implicitly by defaulting logic

NotSet - not set

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ShawnDEV 678 on at

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Hi,

In case a field is 'Set' state,

does that mean that a field value is set (or returned from the source) or only just a field whether the field value is contained or not?

Thank you.

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Martin Dráb 237,880 Most Valuable Professional on at

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If it was just about the value, the state wouldn't be needed at all. You would simply check the value.

Imagine this scenario: A value is empty and I want to set the field to a default value only if it's empty because it wasn't provided at all. If it was explicitly provided as empty, I don't want to overwrite it with a default value.

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