CoreData - can't set empty string as default value for attribute

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鱼传尺愫
鱼传尺愫 2021-02-06 22:08

I have an entity in my datamodel with a string attribute that is currently optional, and I\'d like to convert this to a required attribute with a default value of the empty stri

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  •  慢半拍i
    慢半拍i (楼主)
    2021-02-06 22:24

    This is a very interesting question. After some testing I don't think this is possible because of the way the text field in the data model is configured.

    In principle, you could use the unicode empty-set character of \u2205 to represent a default empty string but the text field does not seem to accept any escapes so it converts any attempt to escape a unicode character code to the literal string of the code characters themselves e.g. entering '\u2205' ends up as the literal text '\u2205'.

    In theory you could write a utility app to read in the graphically generated managed object model file and then programmatically set the attribute default to equal an empty string and then save the file back to disk. I say "in theory" because there is no documented way to way to save a managed object model file from code. You can read one and modify it in memory but not persist the changes.

    Bit of an oversight, I think.

    I don't think you have any choice but to set the default empty string pragmatically when the model first loads. That is simple to do but it's ugly and you'll have to remember you did (especially if you migrate versions) but I think right now that is the only choice.

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