Class Sequel::Postgres::ArrayOp
In: lib/sequel/extensions/pg_array_ops.rb
Parent: Sequel::SQL::Wrapper

The ArrayOp class is a simple container for a single object that defines methods that yield Sequel expression objects representing PostgreSQL array operators and functions.

In the method documentation examples, assume that:

  array_op = :array.pg_array

Methods

[]   all   any   concat   contained_by   contains   dims   hstore   join   length   lower   overlaps   pg_array   push   remove   replace   to_string   unnest   unshift  

Constants

CONCAT = ["(".freeze, " || ".freeze, ")".freeze].freeze
CONTAINS = ["(".freeze, " @> ".freeze, ")".freeze].freeze
CONTAINED_BY = ["(".freeze, " <@ ".freeze, ")".freeze].freeze
OVERLAPS = ["(".freeze, " && ".freeze, ")".freeze].freeze

Public Instance methods

Access a member of the array, returns an SQL::Subscript instance:

  array_op[1] # array[1]

[Source]

    # File lib/sequel/extensions/pg_array_ops.rb, line 78
78:       def [](key)
79:         s = Sequel::SQL::Subscript.new(self, [key])
80:         s = ArrayOp.new(s) if key.is_a?(Range)
81:         s
82:       end

Call the ALL function:

  array_op.all # ALL(array)

Usually used like:

  dataset.where(1=>array_op.all)
  # WHERE (1 = ALL(array))

[Source]

    # File lib/sequel/extensions/pg_array_ops.rb, line 92
92:       def all
93:         function(:ALL)
94:       end

Call the ANY function:

  array_op.all # ANY(array)

Usually used like:

  dataset.where(1=>array_op.any)
  # WHERE (1 = ANY(array))

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 104
104:       def any
105:         function(:ANY)
106:       end
concat(other)

Alias for push

Use the contained by (<@) operator:

  array_op.contained_by(:a) # (array <@ a)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 118
118:       def contained_by(other)
119:         bool_op(CONTAINED_BY, wrap_array(other))
120:       end

Use the contains (@>) operator:

  array_op.contains(:a) # (array @> a)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 111
111:       def contains(other)
112:         bool_op(CONTAINS, wrap_array(other))
113:       end

Call the array_dims method:

  array_op.dims # array_dims(array)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 125
125:       def dims
126:         function(:array_dims)
127:       end

Convert the array into an hstore using the hstore function. If given an argument, use the two array form:

  array_op.hstore          # hstore(array)
  array_op.hstore(:array2) # hstore(array, array2)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 134
134:       def hstore(arg=(no_arg_given=true; nil))
135:         v = if no_arg_given
136:           Sequel.function(:hstore, self)
137:         else
138:           Sequel.function(:hstore, self, wrap_array(arg))
139:         end
140:         if Sequel.respond_to?(:hstore_op)
141:           v = Sequel.hstore_op(v)
142:         end
143:         v
144:       end
join(joiner="", null=nil)

Alias for to_string

Call the array_length method:

  array_op.length    # array_length(array, 1)
  array_op.length(2) # array_length(array, 2)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 150
150:       def length(dimension = 1)
151:         function(:array_length, dimension)
152:       end

Call the array_lower method:

  array_op.lower    # array_lower(array, 1)
  array_op.lower(2) # array_lower(array, 2)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 158
158:       def lower(dimension = 1)
159:         function(:array_lower, dimension)
160:       end

Use the overlaps (&&) operator:

  array_op.overlaps(:a) # (array && a)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 165
165:       def overlaps(other)
166:         bool_op(OVERLAPS, wrap_array(other))
167:       end

Return the receiver.

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 179
179:       def pg_array
180:         self
181:       end

Use the concatentation (||) operator:

  array_op.push(:a) # (array || a)
  array_op.concat(:a) # (array || a)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 173
173:       def push(other)
174:         array_op(CONCAT, [self, wrap_array(other)])
175:       end

Remove the given element from the array:

  array_op.remove(1) # array_remove(array, 1)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 186
186:       def remove(element)
187:         ArrayOp.new(function(:array_remove, element))
188:       end

Replace the given element in the array with another element:

  array_op.replace(1, 2) # array_replace(array, 1, 2)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 194
194:       def replace(element, replacement)
195:         ArrayOp.new(function(:array_replace, element, replacement))
196:       end

Call the array_to_string method:

  array_op.join           # array_to_string(array, '', NULL)
  array_op.to_string      # array_to_string(array, '', NULL)
  array_op.join(":")      # array_to_string(array, ':', NULL)
  array_op.join(":", "*") # array_to_string(array, ':', '*')

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 204
204:       def to_string(joiner="", null=nil)
205:         function(:array_to_string, joiner, null)
206:       end

Call the unnest method:

  array_op.unnest # unnest(array)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 212
212:       def unnest
213:         function(:unnest)
214:       end

Use the concatentation (||) operator, reversing the order:

  array_op.unshift(:a) # (a || array)

[Source]

     # File lib/sequel/extensions/pg_array_ops.rb, line 219
219:       def unshift(other)
220:         array_op(CONCAT, [wrap_array(other), self])
221:       end

[Validate]