Parse mysql2 gem SELECT query - ruby

Question

I am trying to parse some output from a query using the mysql2 gem.
Previously, I would use:
response = JSON.parse(response.body)
a = response.map{|s| {label: s['Category'], value: s['count'].to_i} }
Now with the mysql2 query:
results = db.query(sql)
results.map do |row|
puts row
end
Output
{"Category"=>"Food", "count"=>22}
{"Category"=>"Drinks", "count"=>12}
{"Category"=>"Alcohol", "count"=>9}
{"Category"=>"Home", "count"=>7}
{"Category"=>"Work", "count"=>2}
'Category' to ':label' and 'count' to ':value'.
results = db.query(sql)
results.map do |row|
{label: row['Category'], value: row['count'].to_i} }
end
Desired Output
{:label=>"Food", :value=>22}
{:label=>"Drinks", :value=>12}
{:label=>"Alcohol", :value=>9}
{:label=>"Home", :value=>7}
{:label=>"Work", :value=>2}

Answer 1

You have two mistakes in your code:
1) You have two closing braces:
# HERE
# | |
results.map do |row| # V V
{label: row['Category'], value: row['count'].to_i} }
end
2) map() returns an array, and you don't save the array anywhere, so ruby discards it.
records = results.map do |row|
{label: row['Category'], value: row['count'].to_i }
end
p records
Here's the proof:
mysql> select * from party_supplies;
+----+----------+-------+
| id | Category | count |
+----+----------+-------+
| 1 | Food | 22 |
| 2 | Drinks | 12 |
+----+----------+-------+
2 rows in set (0.00 sec)
.
require 'mysql2'
client = Mysql2::Client.new(
host: "localhost",
username: "root",
database: "my_db",
)
results = client.query("SELECT * FROM party_supplies")
records = results.map do |row|
{ label: row['Category'], value: row['count'] }
end
p records
--output:--
[{:label=>"Food", :value=>22}, {:label=>"Drinks", :value=>12}]
Note that your output indicates the 'count' field is already an int, so calling to_i() is redundant.