Class: Linkage::Expectations::Match

Inherits:
Simple show all
Defined in:
lib/linkage/expectations/simple.rb

Direct Known Subclasses

Cross, Dual, Self

Constant Summary

Constants inherited from Simple

Simple::VALID_OPERATORS

Instance Attribute Summary

Attributes inherited from Simple

#meta_object_1, #meta_object_2, #operator, #side

Instance Method Summary collapse

Methods inherited from Simple

create, #decollation_needed?, #exactly!, #initialize, #same_except_side?

Methods inherited from Linkage::Expectation

#decollation_needed?, #kind

Constructor Details

This class inherits a constructor from Linkage::Expectations::Simple

Instance Method Details

#apply_to(dataset, side) ⇒ Object 



123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
 
# File 'lib/linkage/expectations/simple.rb', line 123

def apply_to(dataset, side)
  target =
    if @meta_object_1.side == side
      @meta_object_1
    elsif @meta_object_2.side == side
      @meta_object_2
    else
      raise ArgumentError, "Invalid `side` argument: #{side}"
    end

  dataset.group_match_more({
    :meta_object => target,
    :alias => merged_field.name
  })
end

#display_warnings ⇒ Object 



143
144
145
146
147
148
149
150
151
152
153
 
# File 'lib/linkage/expectations/simple.rb', line 143

def display_warnings
  object_1 = @meta_object_1.object
  object_2 = @meta_object_2.object
  if object_1.ruby_type[:type] == String && object_2.ruby_type[:type] == String
    if @meta_object_1.dataset.database_type != @meta_object_2.dataset.database_type
      warn "NOTE: You are comparing two string fields (#{object_1.name} and #{object_2.name}) from different databases. This may result in unexpected results, as different databases compare strings differently. Consider using the =binary= function."
    elsif object_1.respond_to?(:collation) && object_1.respond_to?(:collation) && object_1.collation != object_2.collation
      warn "NOTE: The two string fields you are comparing (#{object_1.name} and #{object_2.name}) have different collations (#{ldata.collation} vs. #{rdata.collation}). This may result in unexpected results, as the database may compare them differently. Consider using the =exactly= method."
    end
  end
end

#merged_field ⇒ Object 



139
140
141
 
# File 'lib/linkage/expectations/simple.rb', line 139

def merged_field
  @merged_field ||= @meta_object_1.merge(@meta_object_2)
end