Syntax to specify limit while generating a model

in rails, we can generate the model like this

rails generate model post title:string body:text published:boolean

And the command has following syntax as per the rails guide

$ rails generate model
Usage: rails generate model NAME [field:type field:type] [options]

I am wondering if its possible to specify limit/length for each field as part of [options]? Further, what is the use of [options] parameter?


You can provide the limit with braces:

rails g model Session session_id:string{40} user_agent:string{200}

In rails 5 I had to use rails g model User name:"string{16}"

I know this is old but does that syntax turn into a varchar() or a char(). is there a difinitive list of the syntax for the model generation that tells someone how to define everything from an index on one or more columns to contraints to null/not null,etc. I tried to add this as a comment to the previous answer but was unable to

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