On Thursday, September 26, 2019 at 4:32:10 PM UTC-4, Ariel Juodziukynas
wrote:
>
> The easiest but too big is a text columns so you can use
> activerecord' serialization of attributes to save anything you want on a
> text field and activerecord will handle casting.
>
> You could use a string column if you know your values won't be too big
> (VARCHAR(255)) and you know what types you want to accept and handle
> serialization yourself like:
>
> def value=(something)
> val = if value.is_a?(Integer)
> "integer:#{something}"
> elsif value.is_a?(String)
> "string:#{something}"
> elsif value.is_a?(Date)
> "date:#{something}
> # etc...
> write_attribute(:value, val)
> end
>
> def value
> type, val = read_attribute(:value).split(':')
> case type
> when "integer" then val.to_i
> when "string" then val
> when "date" then Date.parse(val)
> etc...
> end
>
>
> El jue., 26 sept. 2019 a las 17:17, fugee ohu (<[email protected]
> <javascript:>>) escribió:
>
>>
>>
>> On Monday, September 16, 2019 at 4:31:29 PM UTC-4, Ariel Juodziukynas
>> wrote:
>>>
>>> Personally, I would do this:
>>>
>>> auctions table
>>> (with the basic shared information of all auctions and an "auction
>>> type"))
>>>
>>> properties table
>>> property_name (like network, carrier, publisher, etc)
>>> auction_type (like cellphone, book, etc)
>>>
>>> auctions_properties
>>> auction_id
>>> property_id
>>> value
>>>
>>> That way you can have any number of auction types with any number of
>>> specific properties with just 3 tables.
>>>
>>> Note that the "value" column would be some string variation (VARCHAR,
>>> CHAR, TEXT, etc) depending on your needs, maybe you want to redesign it a
>>> little if you want to store different types. Like if you want to store an
>>> integer (and retrieve an integer) you'll have to save the original type and
>>> reparse it (you could use serialization but that requires a TEXT column and
>>> maybe you can't use that many space)
>>>
>>> El lun., 16 sept. 2019 a las 17:19, fugee ohu (<[email protected]>)
>>> escribió:
>>>
>>>> I was looking at some auction projects that use a single listings table
>>>> for all auctions but I know on auction sites the form will be different
>>>> for
>>>> different types of items like if you're selling a cell phone there'll be a
>>>> form field for network, carrier, whatever and if you're selling a book
>>>> there'll be form fields for publisher, year of publication, so they would
>>>> have separate tables I assume for books, cell phones, etc? Then how would
>>>> they treat them all as one?
>>>>
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>>>>
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>>>> .
>>>>
>>>
>> What data type do you suggest for value column
>>
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>> .
>>
>
If I'm using a string column then whatever value is put in it is a string,
so I don't understand all these "'if value.is_a?" conditions
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