Assign variable to multiple vectors in Clojure

Question

The clojure.contrib.sql module has a create-table function that takes the table name and a list of specifications, like this:

(sql/create-table :services
                  [:id :serial "PRIMARY KEY"]
                  [:service_name :varchar "NOT NULL"]
                  [:pass_hash :varchar "NOT NULL"]
                  [:token :varchar "NOT NULL"])

If I'm reusing the same columns again and again, is there a way to define something like this?

(def same-columns 
                  [:id :serial "PRIMARY KEY"]
                  [:service_name :varchar "NOT NULL"]
                  [:pass_hash :varchar "NOT NULL"]
                  [:token :varchar "NOT NULL"])

When I tried running that in the REPL I got an error, because it passes too many arguments to def.

Jonas · Accepted Answer · 2011-10-01 20:48:20Z

3

You could probably use apply for this:

(def same-columns [[:id :serial "PRIMARY KEY"]
                   [:service_name :varchar "NOT NULL"]
                   [:pass_hash :varchar "NOT NULL"]
                   [:token :varchar "NOT NULL"]])

(apply sql/create-table 
       :services 
       same-columns)

If you have other columns you can add those as well:

(apply sql/create-table 
       :services
       [:some-column :varchar "NOT NULL"]
       same-columns)

answered Oct 1, 2011 at 20:48

Jonas

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