Rails：组合实例变量，以显示具有不同值的唯一记录

Question

I'm combining two instance variables, but its displaying two of the same values because sometimes each of my instance variable has the same record. How do I only display distinct?

  @var1 = Image.tagged_with(params[:tags])
  @var2 = Image.psql_search(params[:tags])

  @Combined = @var1 + @var2

@var1 is from acts-as-taggable gem, and @var2 is from postgresql full-text.

Answer 1

Get the unique IDs of the objects and map them to a new array (using OpenStruct in place of ActiveRecord objects here for example):

@combined = [OpenStruct.new(:id => 1), OpenStruct.new(:id => 1), OpenStruct.new(:id => 2)]
#=> [#<OpenStruct id=1>, #<OpenStruct id=1>, #<OpenStruct id=2>]
@combined.map(&:id).uniq.map {|x| @combined.find {|y| y.id == x}}
#=> [#<OpenStruct id=1>, #<OpenStruct id=2>]

• http://www.ruby-doc.org/core-1.9.3/Enumerable.html#method-i-find
• http://www.ruby-doc.org/core-1.9.3/Array.html#method-i-uniq
• http://www.ruby-doc.org/stdlib-1.9.3/libdoc/ostruct/rdoc/OpenStruct.html#method-c-new

This solution doesn't address original database queries, and only addresses presentation issues.