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Extract clusterfuck method for surgery
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Original file line number | Diff line number | Diff line change |
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module ActiveRecord | ||
class Relation | ||
class Merger | ||
attr_reader :relation, :other | ||
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def initialize(relation, other) | ||
@relation = relation | ||
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if other.default_scoped? && other.klass != relation.klass | ||
@other = other.with_default_scope | ||
else | ||
@other = other | ||
end | ||
end | ||
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def merge | ||
Relation::ASSOCIATION_METHODS.each do |method| | ||
value = other.send(:"#{method}_values") | ||
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unless value.empty? | ||
relation.send("#{method}!", value) | ||
end | ||
end | ||
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(Relation::MULTI_VALUE_METHODS - [:joins, :where, :order, :binds]).each do |method| | ||
value = other.send(:"#{method}_values") | ||
next if value.empty? | ||
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value += relation.send(:"#{method}_values") | ||
relation.send :"#{method}_values=", value | ||
end | ||
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relation.joins_values += other.joins_values | ||
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merged_wheres = relation.where_values + other.where_values | ||
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merged_binds = (relation.bind_values + other.bind_values).uniq(&:first) | ||
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unless relation.where_values.empty? | ||
# Remove duplicates, last one wins. | ||
seen = Hash.new { |h,table| h[table] = {} } | ||
merged_wheres = merged_wheres.reverse.reject { |w| | ||
nuke = false | ||
if w.respond_to?(:operator) && w.operator == :== | ||
name = w.left.name | ||
table = w.left.relation.name | ||
nuke = seen[table][name] | ||
seen[table][name] = true | ||
end | ||
nuke | ||
}.reverse | ||
end | ||
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relation.where_values = merged_wheres | ||
relation.bind_values = merged_binds | ||
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(Relation::SINGLE_VALUE_METHODS - [:lock, :create_with, :reordering]).each do |method| | ||
value = other.send(:"#{method}_value") | ||
relation.send(:"#{method}_value=", value) unless value.nil? | ||
end | ||
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relation.lock_value = other.lock_value unless relation.lock_value | ||
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unless other.create_with_value.empty? | ||
relation.create_with_value = (relation.create_with_value || {}).merge(other.create_with_value) | ||
end | ||
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if other.reordering_value | ||
# override any order specified in the original relation | ||
relation.reordering_value = true | ||
relation.order_values = other.order_values | ||
else | ||
# merge in order_values from r | ||
relation.order_values += other.order_values | ||
end | ||
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# Apply scope extension modules | ||
relation.send :apply_modules, other.extensions | ||
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relation | ||
end | ||
end | ||
end | ||
end |
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