### Home Classes Methods

### In Files

- lib/sequel/plugins/many_through_many.rb

### Methods

- #def_many_through_many
- #many_through_many

### Files

- CHANGELOG
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# Sequel::Plugins::ManyThroughMany::ClassMethods

### Public Instance Methods

many_through_many(name, through, opts={}, &block) click to toggle source

Create a many_through_many association. Arguments:

- name - Same as associate, the name of the association.

- through - The tables and keys to join between the current table and the associated table. Must be an array, with elements that are either 3 element arrays, or hashes with keys :table, :left, and :right. The required entries in the array/hash are:

  - :table (first array element) - The name of the table to join.

  - :left (middle array element) - The key joining the table to the previous table. Can use an array of symbols for a composite key association.

  - :right (last array element) - The key joining the table to the next table. Can use an array of symbols for a composite key association.

  If a hash is provided, the following keys are respected when using eager_graph:

  - :block - A proc to use as the block argument to join.

  - :conditions - Extra conditions to add to the JOIN ON clause. Must be a hash or array of two pairs.

  - :join_type - The join type to use for the join, defaults to :left_outer.

  - :only_conditions - Conditions to use for the join instead of the ones specified by the keys.

- opts - The options for the associaion. Takes the same options as associate, and supports these additional options:

  - :left_primary_key - column in current table that the first :left option in through points to, as a symbol. Defaults to primary key of current table. Can use an array of symbols for a composite key association.

  - :right_primary_key - column in associated table that the final :right option in through points to, as a symbol. Defaults to primary key of the associated table. Can use an array of symbols for a composite key association.

  - :uniq - Adds a after_load callback that makes the array of objects unique.

         # File lib/sequel/plugins/many_through_many.rb, line 154
    154:         def many_through_many(name, through, opts={}, &block)
    155:           associate(:many_through_many, name, opts.merge(through.is_a?(Hash) ? through : {:through=>through}), &block)
    156:         end

### Private Instance Methods

def_many_through_many(opts) click to toggle source

Create the association methods and :eager_loader and :eager_grapher procs.

         # File lib/sequel/plugins/many_through_many.rb, line 161
    161:         def def_many_through_many(opts)
    162:           name = opts[:name]
    163:           model = self
    164:           opts[:read_only] = true
    165:           opts[:after_load].unshift(:array_uniq!) if opts[:uniq]
    166:           opts[:cartesian_product_number] ||= 2
    167:           opts[:through] = opts[:through].map do |e|
    168:             case e
    169:             when Array
    170:               raise(Error, "array elements of the through option/argument for many_through_many associations must have at least three elements") unless e.length == 3
    171:               {:table=>e[0], :left=>e[1], :right=>e[2]}
    172:             when Hash
    173:               raise(Error, "hash elements of the through option/argument for many_through_many associations must contain :table, :left, and :right keys") unless e[:table] && e[:left] && e[:right]
    174:               e
    175:             else
    176:               raise(Error, "the through option/argument for many_through_many associations must be an enumerable of arrays or hashes")
    177:             end
    178:           end
    179:
    180:           left_key = opts[:left_key] = opts[:through].first[:left]
    181:           uses_lcks = opts[:uses_left_composite_keys] = left_key.is_a?(Array)
    182:           left_keys = Array(left_key)
    183:           left_pk = (opts[:left_primary_key] ||= self.primary_key)
    184:           left_pks = opts[:left_primary_keys] = Array(left_pk)
    185:           opts[:dataset] ||= lambda do
    186:             ds = opts.associated_class
    187:             opts.reverse_edges.each{|t| ds = ds.join(t[:table], Array(t[:left]).zip(Array(t[:right])), :table_alias=>t[:alias])}
    188:             ft = opts[:final_reverse_edge]
    189:             ds.join(ft[:table],  Array(ft[:left]).zip(Array(ft[:right])) + left_keys.zip(left_pks.map{|k| send(k)}), :table_alias=>ft[:alias])
    190:           end
    191:
    192:           left_key_alias = opts[:left_key_alias] ||= opts.default_associated_key_alias
    193:           opts[:eager_loader] ||= lambda do |eo|
    194:             h = eo[:key_hash][left_pk]
    195:             rows = eo[:rows]
    196:             rows.each{|object| object.associations[name] = []}
    197:             ds = opts.associated_class
    198:             opts.reverse_edges.each{|t| ds = ds.join(t[:table], Array(t[:left]).zip(Array(t[:right])), :table_alias=>t[:alias])}
    199:             ft = opts[:final_reverse_edge]
    200:             ds = ds.join(ft[:table], Array(ft[:left]).zip(Array(ft[:right])) + [[opts.eager_loading_predicate_key, h.keys]], :table_alias=>ft[:alias])
    201:             ds = model.eager_loading_dataset(opts, ds, nil, eo[:associations], eo)
    202:             case opts.eager_limit_strategy
    203:             when :window_function
    204:               delete_rn = true
    205:               rn = ds.row_number_column
    206:               ds = apply_window_function_eager_limit_strategy(ds, opts)
    207:             when :correlated_subquery
    208:               ds = apply_correlated_subquery_eager_limit_strategy(ds, opts) do |xds|
    209:                 dsa = ds.send(:dataset_alias, 2)
    210:                 opts.reverse_edges.each{|t| xds = xds.join(t[:table], Array(t[:left]).zip(Array(t[:right])), :table_alias=>t[:alias])}
    211:                 xds.join(ft[:table], Array(ft[:left]).zip(Array(ft[:right])) + left_keys.map{|k| [k, SQL::QualifiedIdentifier.new(ft[:table], k)]}, :table_alias=>dsa)
    212:               end
    213:             end
    214:             ds.all do |assoc_record|
    215:               assoc_record.values.delete(rn) if delete_rn
    216:               hash_key = if uses_lcks
    217:                 left_key_alias.map{|k| assoc_record.values.delete(k)}
    218:               else
    219:                 assoc_record.values.delete(left_key_alias)
    220:               end
    221:               next unless objects = h[hash_key]
    222:               objects.each{|object| object.associations[name].push(assoc_record)}
    223:             end
    224:             if opts.eager_limit_strategy == :ruby
    225:               limit, offset = opts.limit_and_offset
    226:               rows.each{|o| o.associations[name] = o.associations[name].slice(offset||0, limit) || []}
    227:             end
    228:           end
    229:
    230:           join_type = opts[:graph_join_type]
    231:           select = opts[:graph_select]
    232:           graph_block = opts[:graph_block]
    233:           only_conditions = opts[:graph_only_conditions]
    234:           use_only_conditions = opts.include?(:graph_only_conditions)
    235:           conditions = opts[:graph_conditions]
    236:           opts[:eager_grapher] ||= proc do |eo|
    237:             ds = eo[:self]
    238:             iq = eo[:implicit_qualifier]
    239:             opts.edges.each do |t|
    240:               ds = ds.graph(t[:table], t.fetch(:only_conditions, (Array(t[:right]).zip(Array(t[:left])) + t[:conditions])), :select=>false, :table_alias=>ds.unused_table_alias(t[:table]), :join_type=>t[:join_type], :implicit_qualifier=>iq, &t[:block])
    241:               iq = nil
    242:             end
    243:             fe = opts[:final_edge]
    244:             ds.graph(opts.associated_class, use_only_conditions ? only_conditions : (Array(opts.right_primary_key).zip(Array(fe[:left])) + conditions), :select=>select, :table_alias=>eo[:table_alias], :join_type=>join_type, &graph_block)
    245:           end
    246:
    247:           def_association_dataset_methods(opts)
    248:         end

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