Select record if the records has same id as any of the ID's in the Array [duplicate]

问题

I am having trouble finding the right syntax and operator to check if a record has the same ID of any of the ID's stored in an Array. Is there a has any? function or similar?

@problem = Remedy.where(["LOWER(\"remedyName\") LIKE?", "%#{params[:searchremedy]}%".downcase]).pluck(:id)

@pretreatments =  Treatment.joins(:remedies_treatment).where(:remedies_treatment_remedy_id == @problem)

I have updated the code to:

 ids = Remedy.where(["LOWER(\"remedyName\") LIKE?", "%#{params[:searchremedy]}%".downcase]).pluck(:id)

 @pretreatments = Treatment.joins(:remedies_treatments).where(remedies_treatments: { remedy_id: @problem })

However the error I am getting now is:

     SELECT "treatments".* FROM "treatments" INNER JOIN "remedies_treatments" ON "remedies_treatments"."treatment_id" = "treatments"."id" WHERE "remedies_treatment"."remedy_id" IS NULL
Completed 500 Internal Server Error in 157ms (ActiveRecord: 17.0ms)

ActiveRecord::StatementInvalid (PG::UndefinedTable: ERROR:  missing FROM-clause entry for table "remedies_treatment"
LINE 1: ...atments"."treatment_id" = "treatments"."id" WHERE "remedies_...
                                                             ^
: SELECT "treatments".* FROM "treatments" INNER JOIN "remedies_treatments" ON "remedies_treatments"."treatment_id" = "treatments"."id" WHERE "remedies_treatment"."remedy_id" IS NULL):
  app/controllers/treatments_controller.rb:116:in `index'



ActiveRecord::StatementInvalid: PG::UndefinedTable: ERROR:  missing FROM-clause entry for table "remedies_treatment"
LINE 1: ...atments"."treatment_id" = "treatments"."id" WHERE "remedies_...
                                                             ^
: SELECT "treatments".* FROM "treatments" INNER JOIN "remedies_treatments" ON "remedies_treatments"."treatment_id" = "treatments"."id" WHERE "remedies_treatment"."remedy_id" IS NULL
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/activerecord-4.2.5/lib/active_record/connection_adapters/postgresql_adapter.rb:592:in `async_exec'

回答1:

Since you wish to match ids, so get the list, and use it in next query:

ids = Remedy.where(["LOWER(\"remedyName\") LIKE?", "%#{params[:searchremedy]}%".downcase]).pluck(:id)

Treatment.joins(:remedies_treatments).where(remedies_treatments: { remedy_id: ids })

NOTE: You should have the following relation in Treatment:

class Treatment
   has_many :remedies_treatments
end

回答2:

Using ActiveRecord, you can search for matching records from the database:

@problem = Remedy.where(["LOWER(\"remedyName\") LIKE?", "%#{params[:searchremedy]}%".downcase]).pluck(:id)
@pretreatments =  Treatment.joins(:remedies_treatment).where(:remedies_treatment_remedy_id: @problem)

This uses the Hash syntax for the where clause, by specifying that you want to retrieve any records where remedies_treatment_remedy_id includes any value in @problem.

来源：https://stackoverflow.com/questions/37416290/select-record-if-the-records-has-same-id-as-any-of-the-ids-in-the-array

标签

ruby-on-rails

postgresql

activerecord

has-many