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lsiden/gist:260167a4d3574a580d97

Last active February 7, 2018 17:53
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Revisions

  1. lsiden revised this gist Jul 25, 2014. 1 changed file with 4 additions and 8 deletions.
    12 changes: 4 additions & 8 deletions gistfile1.rb
    View file
    Original file line number Diff line number Diff line change
    @@ -9,15 +9,11 @@ def self.included(base)
    module ClassMethods
    def union_scope(*scopes)
    id_column = "#{table_name}.id"

    where case scopes.reduce(0) { |c, s| c + s.count }
    when 0
    "1 = 0"
    when 1
    scopes[0].to_sql

    if (sub_query = scopes.reject { |sc| sc.count == 0 }.map { |s| s.select(id_column).to_sql }.join(" UNION ")).present?
    where "#{id_column} IN (#{sub_query})"
    else
    sub_query = scopes.map { |s| s.select(id_column).to_sql }.join(" UNION ")
    "#{id_column} IN (#{sub_query})"
    none
    end
    end
    end
  2. lsiden revised this gist Jul 24, 2014. 1 changed file with 2 additions and 2 deletions.
    4 changes: 2 additions & 2 deletions gistfile1.rb
    View file
    Original file line number Diff line number Diff line change
    @@ -9,8 +9,8 @@ def self.included(base)
    module ClassMethods
    def union_scope(*scopes)
    id_column = "#{table_name}.id"
    ar_queries = scopes.map { |s| s.select(id_column) }.flatten
    where case ar_queries.length

    where case scopes.reduce(0) { |c, s| c + s.count }
    when 0
    "1 = 0"
    when 1
  3. lsiden created this gist Jul 21, 2014.
    24 changes: 24 additions & 0 deletions gistfile1.rb
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,24 @@
    #https://gist.github.com/tlowrimore/5162327
    #http://stackoverflow.com/a/15413611/270511

    module ActiveRecord::UnionScope
    def self.included(base)
    base.send :extend, ClassMethods
    end

    module ClassMethods
    def union_scope(*scopes)
    id_column = "#{table_name}.id"
    ar_queries = scopes.map { |s| s.select(id_column) }.flatten
    where case ar_queries.length
    when 0
    "1 = 0"
    when 1
    scopes[0].to_sql
    else
    sub_query = scopes.map { |s| s.select(id_column).to_sql }.join(" UNION ")
    "#{id_column} IN (#{sub_query})"
    end
    end
    end
    end