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2a0d97bc89
emit an event when we instantiate AR objects so we can see how many records were instantiated and how long it took
68 lines
3.7 KiB
Ruby
68 lines
3.7 KiB
Ruby
module ActiveRecord
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module Querying
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delegate :find, :take, :take!, :first, :first!, :last, :last!, :exists?, :any?, :many?, to: :all
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delegate :second, :second!, :third, :third!, :fourth, :fourth!, :fifth, :fifth!, :forty_two, :forty_two!, to: :all
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delegate :first_or_create, :first_or_create!, :first_or_initialize, to: :all
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delegate :find_or_create_by, :find_or_create_by!, :find_or_initialize_by, to: :all
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delegate :find_by, :find_by!, to: :all
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delegate :destroy, :destroy_all, :delete, :delete_all, :update, :update_all, to: :all
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delegate :find_each, :find_in_batches, to: :all
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delegate :select, :group, :order, :except, :reorder, :limit, :offset, :joins,
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:where, :rewhere, :preload, :eager_load, :includes, :from, :lock, :readonly,
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:having, :create_with, :uniq, :distinct, :references, :none, :unscope, to: :all
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delegate :count, :average, :minimum, :maximum, :sum, :calculate, to: :all
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delegate :pluck, :ids, to: :all
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# Executes a custom SQL query against your database and returns all the results. The results will
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# be returned as an array with columns requested encapsulated as attributes of the model you call
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# this method from. If you call <tt>Product.find_by_sql</tt> then the results will be returned in
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# a +Product+ object with the attributes you specified in the SQL query.
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#
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# If you call a complicated SQL query which spans multiple tables the columns specified by the
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# SELECT will be attributes of the model, whether or not they are columns of the corresponding
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# table.
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#
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# The +sql+ parameter is a full SQL query as a string. It will be called as is, there will be
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# no database agnostic conversions performed. This should be a last resort because using, for example,
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# MySQL specific terms will lock you to using that particular database engine or require you to
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# change your call if you switch engines.
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#
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# # A simple SQL query spanning multiple tables
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# Post.find_by_sql "SELECT p.title, c.author FROM posts p, comments c WHERE p.id = c.post_id"
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# # => [#<Post:0x36bff9c @attributes={"title"=>"Ruby Meetup", "first_name"=>"Quentin"}>, ...]
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#
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# You can use the same string replacement techniques as you can with <tt>ActiveRecord::QueryMethods#where</tt>:
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#
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# Post.find_by_sql ["SELECT title FROM posts WHERE author = ? AND created > ?", author_id, start_date]
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# Post.find_by_sql ["SELECT body FROM comments WHERE author = :user_id OR approved_by = :user_id", { :user_id => user_id }]
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def find_by_sql(sql, binds = [])
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result_set = connection.select_all(sanitize_sql(sql), "#{name} Load", binds)
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column_types = result_set.column_types.dup
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columns_hash.each_key { |k| column_types.delete k }
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message_bus = ActiveSupport::Notifications.instrumenter
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payload = {
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record_count: result_set.length,
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class_name: name
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}
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message_bus.instrument('instantiation.active_record', payload) do
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result_set.map { |record| instantiate(record, column_types) }
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end
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end
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# Returns the result of an SQL statement that should only include a COUNT(*) in the SELECT part.
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# The use of this method should be restricted to complicated SQL queries that can't be executed
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# using the ActiveRecord::Calculations class methods. Look into those before using this.
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#
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# ==== Parameters
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#
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# * +sql+ - An SQL statement which should return a count query from the database, see the example below.
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#
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# Product.count_by_sql "SELECT COUNT(*) FROM sales s, customers c WHERE s.customer_id = c.id"
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def count_by_sql(sql)
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sql = sanitize_conditions(sql)
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connection.select_value(sql, "#{name} Count").to_i
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end
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end
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end
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