The JSONBaseOp class is a simple container for a single object that defines methods that yield Sequel expression objects representing PostgreSQL json operators and functions.
In the method documentation examples, assume that:
json_op = Sequel.pg_json(:json)
Get JSON array element or object field as json. If an array is given, gets the object at the specified path.
json_op[1] # (json -> 1) json_op['a'] # (json -> 'a') json_op[%w'a b'] # (json #> ARRAY['a', 'b'])
# File lib/sequel/extensions/pg_json_ops.rb, line 89 def [](key) if is_array?(key) json_op(GET_PATH, wrap_array(key)) else json_op(GET, key) end end
Returns a set of json values for the elements in the json array.
json_op.array_elements # json_array_elements(json)
# File lib/sequel/extensions/pg_json_ops.rb, line 101 def array_elements function(:array_elements) end
Returns a set of text values for the elements in the json array.
json_op.array_elements_text # json_array_elements_text(json)
# File lib/sequel/extensions/pg_json_ops.rb, line 108 def array_elements_text function(:array_elements_text) end
Get the length of the outermost json array.
json_op.array_length # json_array_length(json)
# File lib/sequel/extensions/pg_json_ops.rb, line 115 def array_length Sequel::SQL::NumericExpression.new(:NOOP, function(:array_length)) end
Returns a set of key and value pairs, where the keys are text and the values are JSON.
json_op.each # json_each(json)
# File lib/sequel/extensions/pg_json_ops.rb, line 123 def each function(:each) end
Returns a set of key and value pairs, where the keys and values are both text.
json_op.each_text # json_each_text(json)
# File lib/sequel/extensions/pg_json_ops.rb, line 131 def each_text function(:each_text) end
Returns a json value for the object at the given path.
json_op.extract('a') # json_extract_path(json, 'a') json_op.extract('a', 'b') # json_extract_path(json, 'a', 'b')
# File lib/sequel/extensions/pg_json_ops.rb, line 139 def extract(*a) self.class.new(function(:extract_path, *a)) end
Returns a text value for the object at the given path.
json_op.extract_text('a') # json_extract_path_text(json, 'a') json_op.extract_text('a', 'b') # json_extract_path_text(json, 'a', 'b')
# File lib/sequel/extensions/pg_json_ops.rb, line 147 def extract_text(*a) Sequel::SQL::StringExpression.new(:NOOP, function(:extract_path_text, *a)) end
Get JSON array element or object field as text. If an array is given, gets the object at the specified path.
json_op.get_text(1) # (json ->> 1) json_op.get_text('a') # (json ->> 'a') json_op.get_text(%w'a b') # (json #>> ARRAY['a', 'b'])
# File lib/sequel/extensions/pg_json_ops.rb, line 157 def get_text(key) if is_array?(key) json_op(GET_PATH_TEXT, wrap_array(key)) else json_op(GET_TEXT, key) end end
Returns a set of keys AS text in the json object.
json_op.keys # json_object_keys(json)
# File lib/sequel/extensions/pg_json_ops.rb, line 168 def keys function(:object_keys) end
Expands the given argument using the columns in the json.
json_op.populate(arg) # json_populate_record(arg, json)
# File lib/sequel/extensions/pg_json_ops.rb, line 175 def populate(arg) SQL::Function.new(function_name(:populate_record), arg, self) end
Expands the given argument using the columns in the json.
json_op.populate_set(arg) # json_populate_recordset(arg, json)
# File lib/sequel/extensions/pg_json_ops.rb, line 182 def populate_set(arg) SQL::Function.new(function_name(:populate_recordset), arg, self) end
Builds arbitrary record from json object. You need to define the structure of the record using as on the resulting object:
json_op.to_record.as(:x, [Sequel.lit('a integer'), Sequel.lit('b text')]) # json_to_record(json) AS x(a integer, b text)
# File lib/sequel/extensions/pg_json_ops.rb, line 190 def to_record(nested_as_text=false) function(:to_record, nested_as_text) end
Builds arbitrary set of records from json array of objects. You need to define the structure of the records using as on the resulting object:
json_op.to_recordset.as(:x, [Sequel.lit('a integer'), Sequel.lit('b text')]) # json_to_recordset(json) AS x(a integer, b text)
# File lib/sequel/extensions/pg_json_ops.rb, line 198 def to_recordset(nested_as_text=false) function(:to_recordset, nested_as_text) end
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