Wie Einfügen in Postgres-Tabelle mit dem PG-Edelstein

Question

Ich erstellte drei DB-Schemas mit Postgres. Die Tische sind definitiv da, ich habe die Shell mit \dt benutzt um sie zu sehen.

Mein SqlRunner schlägt fehl, wenn ich versuche, mit meiner seeds.rb-Datei einen INSERT zu erstellen. Das Terminal gibt einen PG :: SyntaxError bei oder in der Nähe von "11.18" zurück. Die vorherige Zeile ist auch ein Float, also weiß ich nicht, was los ist.

Das Modell sieht so aus:

require('pg') 
require('../project_giclee_db/sql_runner') 


class Material 

    attr_reader :id, :product_name, :guk_name, :roll_width_in, :roll_length_metres, :list_price, :cost_per_sqm, 
    :cost_per_sqm_with_ink, :factor_n, :sell_per_sqm, :rounded_sale_price 


    def initialize(options) 
    @id = options['id'].to_i 
    @product_name = options['product_name'] 
    @guk_name = options['guk_name'] 
    @roll_width_in = options['roll_width_in'].to_i 
    @roll_length_metres = options['roll_length_metres'].to_i 
    @list_price = options['list_price'].to_f 
    @cost_per_sqm = options['cost_per_sqm'].to_f 
    @cost_per_sqm_with_ink = options['cost_per_sqm_with_ink'].to_f 
    @factor_n = options['factor_n'].to_f 
    @sell_per_sqm = options['sell_per_sqm'].to_f 
    @rounded_sale_price = options['rounded_sale_price'].to_i 

    end 


    def save 
    sql = "INSERT INTO materials (product_name, guk_name, roll_width_in, roll_length_metres, 
    list_price, cost_per_sqm, cost_per_sqm_with_ink, factor_n, sell_per_sqm, rounded_sale_price) 
    VALUES (#{@product_name}, #{@guk_name}, #{@roll_width_in}, #{@roll_length_metres}, #{@list_price} 
    #{@cost_per_sqm}, #{@cost_per_sqm_with_ink}, #{@factor_n}, #{@sell_per_sqm}, #{@rounded_sale_price} 
    ) RETURNING *" 

    data = SqlRunner.run(sql).first 
    @id = data['id'] 
    end 


    def self.delete_all 
    sql = "DELETE FROM materials" 
    SqlRunner.run(sql) 
    end 

end 

Runner wie folgt aussieht:

require('pg') 

class SqlRunner 

    def self.run(sql) 
    begin 
    db = PG.connect({dbname: 'giclee_db', host: 'localhost'}) 
    result = db.exec(sql) 
    ensure 
    db.close 
    end 
    return result 
end 

end 

Seed-Daten wie folgt aussieht:

require('../models/materials') 
require('pry-byebug') 

Material.delete_all 

@material1 = Material.new({ 'product_name' => 'giclee_canvas', 'guk_name' => 'canvas', 
'roll_width_in' => 44, 'roll_length_metres' => 12, 'list_price' => 150.00, 
'cost_per_sqm' => 11.18, 'cost_per_sqm_with_ink' => 14.18, 'factor_n' => 11.00, 
'sell_per_sqm' => 156.03, 'rounded_sale_price' => 156 
}) 


@material1.save 

Answer 1

Sie Anführungszeichen um die Saiten haben sollte:

def save 
sql = "INSERT INTO materials (product_name, guk_name, roll_width_in, roll_length_metres, 
list_price, cost_per_sqm, cost_per_sqm_with_ink, factor_n, sell_per_sqm, rounded_sale_price) 
VALUES ('#{@product_name}', '#{@guk_name}', #{@roll_width_in}, #{@roll_length_metres}, #{@list_price} 
#{@cost_per_sqm}, #{@cost_per_sqm_with_ink}, #{@factor_n}, #{@sell_per_sqm}, #{@rounded_sale_price} 
) RETURNING *" 

    data = SqlRunner.run(sql).first 
    @id = data['id'] 
end 

Answer 2

Das Problem ist, ein fehlendes Komma am Ende der Zeile in der SQL:

VALUES ('#{@product_name}', '#{@guk_name}', #{@roll_width_in}, #{@roll_length_metres}, #{@list_price}