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Destination attribute mapping not showing newly added attribute in xcmodelmappingmodel while Coredata migration


Destination attribute mapping not showing newly added attribute in xcmodelmappingmodel while Coredata migration

By : animesh dhokare
Date : November 28 2020, 11:01 PM
it fixes the issue I have a coredata mapping where Version model had 4 attributes , Creating a new .xcmappingmodel solved my problem.
code :


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CoreData migration & data mapping: creating a new entity from existing attribute

CoreData migration & data mapping: creating a new entity from existing attribute


By : user2967983
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I have sold this problem using a great description found here.
Update: (Fixed link to what appears to be the same blog post)
After Core Data lightweight migration to a version where a new attribute was added that attribute is nil

After Core Data lightweight migration to a version where a new attribute was added that attribute is nil


By : user1997587
Date : March 29 2020, 07:55 AM
seems to work fine This is actually fairly simple, but may be a bit unintuitive.
The reason you see this new attribute value as 'nil' is because you most likely defined it as an 'optional' attribute. This means it is acceptable for it to be set to nil, so CoreData wont populate it during migration.
CoreData Migration new attribute Swift

CoreData Migration new attribute Swift


By : Sunny G
Date : March 29 2020, 07:55 AM
it helps some times One way is to write a reader function that throws and in the error handling call a different function which is for the old inputs . PS, would be easier to help you if you post the code
code :
//error type
enum Error: ErrorType{
    case OldInput
}
func fetchFromDatabase() throws {
   //do you fetching 
   if //condition if the new attribute exists {
        //fetch
        return
   }
   throw Error.OldInput
}

//calling it
do {
   try fetchFromDatabase()
} catch (error) {
   fetchFromDatabaseOld()
}
Swift - Coredata Migration - Set new attribute value according to old attribute value

Swift - Coredata Migration - Set new attribute value according to old attribute value


By : David Moore
Date : March 29 2020, 07:55 AM
To fix this issue Lightweight migration can't do this. You'll have to create a mapping model and a subclass of NSEntityMigrationPolicy. It's not difficult but it's unfamiliar territory for most iOS developers. The steps run like this:
Create the mapping model. In Xcode, File --> New --> Mapping Model. When you click "Next", Xcode will ask for the source (old) and destination (new) model files for this mapping. The model file will infer mappings where possible. Everything else will be blank. With your type and some other properties, it'll look something like the following. Entries like $source.timestamp mean to copy the existing value from before the migration.
code :
func typeFor(isSaved:NSNumber) -> NSNumber {
    if isSaved.boolValue {
        return NSNumber(integerLiteral: 1)
    } else {
        return NSNumber(integerLiteral: 2)
    }
}
XSLT: Positioning of newly added attribute

XSLT: Positioning of newly added attribute


By : tjarr
Date : March 29 2020, 07:55 AM
I hope this helps . The XSLT language does not provide a way to control the order of attributes, because the XML language specification states explicitly that the order of attributes is not significant.
Still, most processors will write out the attributes in the order of the instructions given to them - so you just need to change the order from (presumably, as you did not show your current code):
code :
<xsl:template match="element">
    <xsl:copy>
        <xsl:attribute name="version">default</xsl:attribute>
        <xsl:apply-templates select="@*|node()"/>
    </xsl:copy>
</xsl:template>
<xsl:template match="element">
    <xsl:copy>
        <xsl:apply-templates select="@*"/>
        <xsl:attribute name="version">default</xsl:attribute>
        <xsl:apply-templates/>
    </xsl:copy>
</xsl:template>
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