如何將參數傳遞給activerecord where子句可能導致表別名錯誤？

Question

我正在運行一個相當複雜（並且確實相當醜陋）的查詢作爲管理搜索頁面的一部分。它按預期工作，直到搜索參數包含a。在它例如。 foo@bar.com打破它，foo @ bar沒有。查詢是建立如下：

DealPurchase.order('created_at DESC').includes(
     :couple => :couple_detail, :vendor => :vendor_detail 
    ).joins(:couple => :couple_detail).joins(:vendor => :vendor_detail).joins(
     "LEFT JOIN coupons ON deal_purchases.coupon_id = coupons.id" 
    ).where(
     "CONCAT_WS(' ', couple_detail.fname, couple_detail.lname) LIKE ? OR " + 
     "vendor_detail.business_name LIKE ? OR " + 
     "users.email LIKE ? OR " + 
     "coupons.coupon_code LIKE ? OR " + 
     "deal_purchases.voucher_code LIKE ?", 
     "%#{params[:search]}%", "%#{params[:search]}%", "%#{params[:search]}%", "%#{params[:search]}%", "%#{params[:search]}%" 
    ).includes(:coupon) 

當生成的查詢工作，它看起來像：

SELECT `deal_purchases`.* FROM `deal_purchases` INNER JOIN `users` ON `users`.`user_id` = `deal_purchases`.`couple_id` INNER JOIN `couple_detail` ON `couple_detail`.`user_id` = `users`.`user_id` INNER JOIN `users` `vendors_deal_purchases` ON `vendors_deal_purchases`.`user_id` = `deal_purchases`.`vendor_id` INNER JOIN `vendor_detail` ON `vendor_detail`.`user_id` = `vendors_deal_purchases`.`user_id` LEFT JOIN coupons ON deal_purchases.coupon_id = coupons.id WHERE (CONCAT_WS(' ', couple_detail.fname, couple_detail.lname) LIKE '%keifatosweet@hotmail%' OR vendor_detail.business_name LIKE '%keifatosweet@hotmail%' OR users.email LIKE '%keifatosweet@hotmail%' OR coupons.coupon_code LIKE '%keifatosweet@hotmail%' OR deal_purchases.voucher_code LIKE '%keifatosweet@hotmail%') ORDER BY created_at DESC 

當PARAMS [：搜索]包括。它看起來像：

SELECT `deal_purchases`.`id` AS t0_r0, `deal_purchases`.`couple_id` AS t0_r1, `deal_purchases`.`vendor_id` AS t0_r2, `deal_purchases`.`deal_id` AS t0_r3, `deal_purchases`.`transaction_id` AS t0_r4, `deal_purchases`.`voucher_code` AS t0_r5, `deal_purchases`.`created_at` AS t0_r6, `deal_purchases`.`updated_at` AS t0_r7, `deal_purchases`.`credit_card_id` AS t0_r8, `deal_purchases`.`used` AS t0_r9, `deal_purchases`.`paid` AS t0_r10, `deal_purchases`.`refunded` AS t0_r11, `deal_purchases`.`cents_spent` AS t0_r12, `deal_purchases`.`weddingful_cents_spent` AS t0_r13, `deal_purchases`.`weddingful_cents_awarded` AS t0_r14, `deal_purchases`.`affiliate_id` AS t0_r15, `deal_purchases`.`affiliate_cents` AS t0_r16, `deal_purchases`.`affiliate_link_id` AS t0_r17, `deal_purchases`.`coupon_id` AS t0_r18, `users`.`user_id` AS t1_r0, `users`.`email` AS t1_r1, `users`.`password` AS t1_r2, `users`.`create_date` AS t1_r3, `users`.`last_updated` AS t1_r4, `users`.`last_login` AS t1_r5, `users`.`user_type` AS t1_r6, `users`.`status` AS t1_r7, `users`.`fb_user_id` AS t1_r8, `couple_detail`.`id` AS t2_r0, `couple_detail`.`user_id` AS t2_r1, `couple_detail`.`fname` AS t2_r2, `couple_detail`.`lname` AS t2_r3, `couple_detail`.`fiance_fname` AS t2_r4, `couple_detail`.`fiance_lname` AS t2_r5, `couple_detail`.`phone` AS t2_r6, `couple_detail`.`address1` AS t2_r7, `couple_detail`.`address2` AS t2_r8, `couple_detail`.`city` AS t2_r9, `couple_detail`.`state` AS t2_r10, `couple_detail`.`country` AS t2_r11, `couple_detail`.`zipcode` AS t2_r12, `couple_detail`.`couple_role` AS t2_r13, `couple_detail`.`fiance_role` AS t2_r14, `couple_detail`.`logo` AS t2_r15, `couple_detail`.`status` AS t2_r16, `couple_detail`.`completed_registration` AS t2_r17, `couple_detail`.`weddingful_cents` AS t2_r18, `vendors_deal_purchases`.`user_id` AS t3_r0, `vendors_deal_purchases`.`email` AS t3_r1, `vendors_deal_purchases`.`password` AS t3_r2, `vendors_deal_purchases`.`create_date` AS t3_r3, `vendors_deal_purchases`.`last_updated` AS t3_r4, `vendors_deal_purchases`.`last_login` AS t3_r5, `vendors_deal_purchases`.`user_type` AS t3_r6, `vendors_deal_purchases`.`status` AS t3_r7, `vendors_deal_purchases`.`fb_user_id` AS t3_r8, `vendor_detail`.`id` AS t4_r0, `vendor_detail`.`user_id` AS t4_r1, `vendor_detail`.`business_name` AS t4_r2, `vendor_detail`.`business_phone` AS t4_r3, `vendor_detail`.`first_name` AS t4_r4, `vendor_detail`.`last_name` AS t4_r5, `vendor_detail`.`url` AS t4_r6, `vendor_detail`.`address1` AS t4_r7, `vendor_detail`.`address2` AS t4_r8, `vendor_detail`.`city` AS t4_r9, `vendor_detail`.`state` AS t4_r10, `vendor_detail`.`country` AS t4_r11, `vendor_detail`.`zipcode` AS t4_r12, `vendor_detail`.`business_description` AS t4_r13, `vendor_detail`.`tagline` AS t4_r14, `vendor_detail`.`logo` AS t4_r15, `vendor_detail`.`logo_caption` AS t4_r16, `vendor_detail`.`store_type` AS t4_r17, `vendor_detail`.`vendor_type` AS t4_r18, `vendor_detail`.`signup_pitch_seen` AS t4_r19, `vendor_detail`.`signup_complete` AS t4_r20, `vendor_detail`.`profile_views` AS t4_r21, `vendor_detail`.`hash_key` AS t4_r22, `vendor_detail`.`available_credits` AS t4_r23, `vendor_detail`.`credit_expire_on` AS t4_r24, `vendor_detail`.`promotion_title` AS t4_r25, `vendor_detail`.`promotion_text` AS t4_r26, `vendor_detail`.`promotion_posted_on` AS t4_r27, `vendor_detail`.`notes` AS t4_r28, `vendor_detail`.`last_updated` AS t4_r29, `vendor_detail`.`claim_date` AS t4_r30, `vendor_detail`.`profile_percentage` AS t4_r31, `vendor_detail`.`vendor_url` AS t4_r32, `vendor_detail`.`status` AS t4_r33, `vendor_detail`.`twilio_number` AS t4_r34 FROM `deal_purchases` INNER JOIN `users` ON `users`.`user_id` = `deal_purchases`.`couple_id` INNER JOIN `couple_detail` ON `couple_detail`.`user_id` = `users`.`user_id` INNER JOIN `users` `vendors_deal_purchases` ON `vendors_deal_purchases`.`user_id` = `deal_purchases`.`vendor_id` INNER JOIN `vendor_detail` ON `vendor_detail`.`user_id` = `vendors_deal_purchases`.`user_id` LEFT JOIN coupons ON deal_purchases.coupon_id = coupons.id WHERE (CONCAT_WS(' ', couple_detail.fname, couple_detail.lname) LIKE '%@hotmail.com%' OR vendor_detail.business_name LIKE '%@hotmail.com%' OR users.email LIKE '%@hotmail.com%' OR coupons.coupon_code LIKE '%@hotmail.com%' OR deal_purchases.voucher_code LIKE '%@hotmail.com%') ORDER BY created_at DESC 

產生的錯誤是：

Mysql2::Error: Not unique table/alias: 'coupons': SELECT `deal_purchases`.`id` AS t0_r0, `deal_purchases`.`couple_id` AS t0_r1, `deal_purchases`.`vendor_id` AS t0_r2, `deal_purchases`.`deal_id` AS t0_r3, `deal_purchases`.`transaction_id` AS t0_r4, `deal_purchases`.`voucher_code` AS t0_r5, `deal_purchases`.`created_at` AS t0_r6, `deal_purchases`.`updated_at` AS t0_r7, `deal_purchases`.`credit_card_id` AS t0_r8, `deal_purchases`.`used` AS t0_r9, `deal_purchases`.`paid` AS t0_r10, `deal_purchases`.`refunded` AS t0_r11, `deal_purchases`.`cents_spent` AS t0_r12, `deal_purchases`.`weddingful_cents_spent` AS t0_r13, `deal_purchases`.`weddingful_cents_awarded` AS t0_r14, `deal_purchases`.`affiliate_id` AS t0_r15, `deal_purchases`.`affiliate_cents` AS t0_r16, `deal_purchases`.`affiliate_link_id` AS t0_r17, `deal_purchases`.`coupon_id` AS t0_r18, `users`.`user_id` AS t1_r0, `users`.`email` AS t1_r1, `users`.`password` AS t1_r2, `users`.`create_date` AS t1_r3, `users`.`last_updated` AS t1_r4, `users`.`last_login` AS t1_r5, `users`.`user_type` AS t1_r6, `users`.`status` AS t1_r7, `users`.`fb_user_id` AS t1_r8, `couple_detail`.`id` AS t2_r0, `couple_detail`.`user_id` AS t2_r1, `couple_detail`.`fname` AS t2_r2, `couple_detail`.`lname` AS t2_r3, `couple_detail`.`fiance_fname` AS t2_r4, `couple_detail`.`fiance_lname` AS t2_r5, `couple_detail`.`phone` AS t2_r6, `couple_detail`.`address1` AS t2_r7, `couple_detail`.`address2` AS t2_r8, `couple_detail`.`city` AS t2_r9, `couple_detail`.`state` AS t2_r10, `couple_detail`.`country` AS t2_r11, `couple_detail`.`zipcode` AS t2_r12, `couple_detail`.`couple_role` AS t2_r13, `couple_detail`.`fiance_role` AS t2_r14, `couple_detail`.`logo` AS t2_r15, `couple_detail`.`status` AS t2_r16, `couple_detail`.`completed_registration` AS t2_r17, `couple_detail`.`weddingful_cents` AS t2_r18, `vendors_deal_purchases`.`user_id` AS t3_r0, `vendors_deal_purchases`.`email` AS t3_r1, `vendors_deal_purchases`.`password` AS t3_r2, `vendors_deal_purchases`.`create_date` AS t3_r3, `vendors_deal_purchases`.`last_updated` AS t3_r4, `vendors_deal_purchases`.`last_login` AS t3_r5, `vendors_deal_purchases`.`user_type` AS t3_r6, `vendors_deal_purchases`.`status` AS t3_r7, `vendors_deal_purchases`.`fb_user_id` AS t3_r8, `vendor_detail`.`id` AS t4_r0, `vendor_detail`.`user_id` AS t4_r1, `vendor_detail`.`business_name` AS t4_r2, `vendor_detail`.`business_phone` AS t4_r3, `vendor_detail`.`first_name` AS t4_r4, `vendor_detail`.`last_name` AS t4_r5, `vendor_detail`.`url` AS t4_r6, `vendor_detail`.`address1` AS t4_r7, `vendor_detail`.`address2` AS t4_r8, `vendor_detail`.`city` AS t4_r9, `vendor_detail`.`state` AS t4_r10, `vendor_detail`.`country` AS t4_r11, `vendor_detail`.`zipcode` AS t4_r12, `vendor_detail`.`business_description` AS t4_r13, `vendor_detail`.`tagline` AS t4_r14, `vendor_detail`.`logo` AS t4_r15, `vendor_detail`.`logo_caption` AS t4_r16, `vendor_detail`.`store_type` AS t4_r17, `vendor_detail`.`vendor_type` AS t4_r18, `vendor_detail`.`signup_pitch_seen` AS t4_r19, `vendor_detail`.`signup_complete` AS t4_r20, `vendor_detail`.`profile_views` AS t4_r21, `vendor_detail`.`hash_key` AS t4_r22, `vendor_detail`.`available_credits` AS t4_r23, `vendor_detail`.`credit_expire_on` AS t4_r24, `vendor_detail`.`promotion_title` AS t4_r25, `vendor_detail`.`promotion_text` AS t4_r26, `vendor_detail`.`promotion_posted_on` AS t4_r27, `vendor_detail`.`notes` AS t4_r28, `vendor_detail`.`last_updated` AS t4_r29, `vendor_detail`.`claim_date` AS t4_r30, `vendor_detail`.`profile_percentage` AS t4_r31, `vendor_detail`.`vendor_url` AS t4_r32, `vendor_detail`.`status` AS t4_r33, `vendor_detail`.`twilio_number` AS t4_r34, `coupons`.`id` AS t5_r0, `coupons`.`coupon_code` AS t5_r1, `coupons`.`region_id` AS t5_r2, `coupons`.`category_id` AS t5_r3, `coupons`.`expiry` AS t5_r4, `coupons`.`max_uses` AS t5_r5, `coupons`.`deal_id` AS t5_r6, `coupons`.`discount_cents` AS t5_r7, `coupons`.`discount_percent` AS t5_r8, `coupons`.`weddingful_cents_awarded` AS t5_r9, `coupons`.`weddingful_cents_percent` AS t5_r10, `coupons`.`used_count` AS t5_r11, `coupons`.`affiliate_id` AS t5_r12, `coupons`.`created_at` AS t5_r13, `coupons`.`updated_at` AS t5_r14 FROM `deal_purchases` INNER JOIN `users` ON `users`.`user_id` = `deal_purchases`.`couple_id` INNER JOIN `couple_detail` ON `couple_detail`.`user_id` = `users`.`user_id` INNER JOIN `users` `vendors_deal_purchases` ON `vendors_deal_purchases`.`user_id` = `deal_purchases`.`vendor_id` INNER JOIN `vendor_detail` ON `vendor_detail`.`user_id` = `vendors_deal_purchases`.`user_id` LEFT OUTER JOIN `coupons` ON `coupons`.`id` = `deal_purchases`.`coupon_id` LEFT JOIN coupons ON deal_purchases.coupon_id = coupons.id WHERE (CONCAT_WS(' ', couple_detail.fname, couple_detail.lname) LIKE '%keifatosweet@hotmail.com%' OR vendor_detail.business_name LIKE '%keifatosweet@hotmail.com%' OR users.email LIKE '%keifatosweet@hotmail.com%' OR coupons.coupon_code LIKE '%keifatosweet@hotmail.com%' OR deal_purchases.voucher_code LIKE '%keifatosweet@hotmail.com%') ORDER BY created_at 

我願意重構如果人們有改進建議查詢的構建方式，但我真正找如果搜索參數包含a，則不會發生爆炸的方法。任何在這方面的建議將不勝感激。

Answer 1

@ JofoCodin的觀點讓我嘗試重寫我左連接的方式來映射到rails所生成的版本。

DealPurchase.order('created_at DESC').includes(
    :couple => :couple_detail, :vendor => :vendor_detail 
).joins(:couple => :couple_detail).joins(:vendor => :vendor_detail).joins(
    "LEFT OUTER JOIN `coupons` ON `coupons`.`id` = `deal_purchases`.`coupon_id`" 
).where(
    "CONCAT_WS(' ', couple_detail.fname, couple_detail.lname) LIKE ? OR " + 
    "vendor_detail.business_name LIKE ? OR " + 
    "users.email LIKE ? OR " + 
    "coupons.coupon_code LIKE ? OR " + 
    "deal_purchases.voucher_code LIKE ?", 
    "%#{params[:search]}%", "%#{params[:search]}%", "%#{params[:search]}%", "%#{params[:search]}%", "%#{params[:search]}%" 
).includes(:coupon) 

這工作，Rails停止在優惠券上創建額外的聯接條款。我希望我能更好地理解發生了什麼，但這至少可以解決具體問題。

感謝您的幫助JofoCinin。