Hi,
I don't fully understand how to make real use of varargs and
destructuring. c.c.sql/create-table is defined as follows:
(create-table name & specs)
Called as follows:
(c.c.sql/create-table
:tblname
[:cola :text "NOT NULL" "PRIMARY KEY"]
[:colb :number "NOT NULL"]
[:colc :blob "NOT NULL")]
I want to store my table definitions in a data structure (I'm open to
which one) such that I can get access to table names later on. However
if I store the definitions in a vector which each element is a vector
of arguments to create-table I'm not able to pass the correct
arguments to create-table.
An example of the data structure:
(def schema
[[:users
[:id :text "PRIMARY KEY" "NOT NULL"]
[:domain :text "NOT NULL"]
[:email :text :unique "NOT NULL"]
[:password :text "NOT NULL"]
[:name :text "NOT NULL"]
[:created :bigint "NOT NULL"]
[:last_login :bigint]]
[:user_token
[:token :text :unique "PRIMARY KEY" "NOT NULL"]
[:user_id :text "NOT NULL" "REFERENCES users(id) ON DELETE CASCADE"]
[:client :text "NOT NULL"]
[:created :bigint "NOT NULL"]
[:last_used :bigint]]])
(defn x [a & b] (prn (str "a: " a)) (prn (str "b: " b)))
(map (fn [y] (x (first y) (rest y))) schema)
results in:
("a: :users"
"b: (([:id :text \"PRIMARY KEY\" \"NOT NULL\"] [:domain :text \"NOT
NULL\"] [:email :text :unique \"NOT NULL\"] [:password :text \"NOT
NULL\"] [:name :text \"NOT NULL\"] [:created :bigint \"NOT NULL\"]
[:last_login :bigint]))"
"a: :user_token"
"b: (([:token :text :unique \"PRIMARY KEY\" \"NOT NULL\"] [:user_id
:text \"NOT NULL\" \"REFERENCES users(id) ON DELETE CASCADE\"]
[:client :text \"NOT NULL\"] [:created :bigint \"NOT NULL\"]
[:last_used :bigint]))")
if I call create-table instead of `x` it gets two arguments, (first y)
and a vector containing the elements in (rest y) instead of (first y)
and each of the elements in (rest y).
How is it possible for me to flatten b such that when passed to
c.c.sql/create-table its fn arguments are satisfied? I feel like
partial need to be used, however I haven't been able to figure it out.
Any help much appreciated!
Cheers,
mike
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