Class: Sequel::Postgres::JSONExistsOp

Inherits:
SQL::Expression show all
Defined in:
lib/sequel/extensions/pg_json_ops.rb

Overview

Object representing json_exists calls

Direct Known Subclasses

JSONValueOp

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from SQL::Expression

#==, attr_reader, #clone, #eql?, #hash, inherited, #inspect

Constructor Details

#initialize(expr, path, opts = OPTS) ⇒ JSONExistsOp

See JSONBaseOp#exists for documentation on the options.



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# File 'lib/sequel/extensions/pg_json_ops.rb', line 906

def initialize(expr, path, opts=OPTS)
  @expr = expr
  @path = path
  @passing = opts[:passing]
  @on_error = opts[:on_error]
  freeze
end

Instance Attribute Details

#expr ⇒ Object (readonly)

Expression (context_item in PostgreSQL terms), usually JSONBaseOp instance



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# File 'lib/sequel/extensions/pg_json_ops.rb', line 894

def expr
  @expr
end

#on_error ⇒ Object (readonly)

How to handle errors when evaluating the JSON path expression



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# File 'lib/sequel/extensions/pg_json_ops.rb', line 903

def on_error
  @on_error
end

#passing ⇒ Object (readonly)

Variables to set in the JSON path expression



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# File 'lib/sequel/extensions/pg_json_ops.rb', line 900

def passing
  @passing
end

#path ⇒ Object (readonly)

JSON path expression to apply against the expression



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# File 'lib/sequel/extensions/pg_json_ops.rb', line 897

def path
  @path
end

Instance Method Details

#sequel_ast_transform(transformer) ⇒ Object

Support transforming of function call expression



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# File 'lib/sequel/extensions/pg_json_ops.rb', line 923

def sequel_ast_transform(transformer)
  opts = {}
  transform_opts(transformer, opts)
  self.class.new(transformer.call(@expr), @path, opts)
end

#to_s_append(ds, sql) ⇒ Object

Append the SQL function call expression to the SQL



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# File 'lib/sequel/extensions/pg_json_ops.rb', line 915

def to_s_append(ds, sql)
  to_s_append_function_name(ds, sql)
  to_s_append_args_passing(ds, sql)
  to_s_append_on_error(ds, sql)
  sql << ')'
end