Module: ArelExtensions
- Defined in:
- lib/arel_extensions/visitors/oracle.rb,
lib/arel_extensions/math.rb,
lib/arel_extensions/aliases.rb,
lib/arel_extensions/helpers.rb,
lib/arel_extensions/railtie.rb,
lib/arel_extensions/version.rb,
lib/arel_extensions/nodes/abs.rb,
lib/arel_extensions/nodes/md5.rb,
lib/arel_extensions/nodes/std.rb,
lib/arel_extensions/nodes/sum.rb,
lib/arel_extensions/attributes.rb,
lib/arel_extensions/nodes/case.rb,
lib/arel_extensions/nodes/cast.rb,
lib/arel_extensions/nodes/ceil.rb,
lib/arel_extensions/nodes/json.rb,
lib/arel_extensions/nodes/rand.rb,
lib/arel_extensions/nodes/then.rb,
lib/arel_extensions/nodes/trim.rb,
lib/arel_extensions/nodes/wday.rb,
lib/arel_extensions/comparators.rb,
lib/arel_extensions/nodes/blank.rb,
lib/arel_extensions/nodes/floor.rb,
lib/arel_extensions/nodes/log10.rb,
lib/arel_extensions/nodes/power.rb,
lib/arel_extensions/nodes/round.rb,
lib/arel_extensions/nodes/union.rb,
lib/arel_extensions/nodes/format.rb,
lib/arel_extensions/nodes/length.rb,
lib/arel_extensions/nodes/locate.rb,
lib/arel_extensions/nodes/repeat.rb,
lib/arel_extensions/predications.rb,
lib/arel_extensions/date_duration.rb,
lib/arel_extensions/nodes/collate.rb,
lib/arel_extensions/nodes/is_null.rb,
lib/arel_extensions/nodes/matches.rb,
lib/arel_extensions/nodes/replace.rb,
lib/arel_extensions/nodes/soundex.rb,
lib/arel_extensions/set_functions.rb,
lib/arel_extensions/insert_manager.rb,
lib/arel_extensions/math_functions.rb,
lib/arel_extensions/nodes/coalesce.rb,
lib/arel_extensions/nodes/duration.rb,
lib/arel_extensions/nodes/function.rb,
lib/arel_extensions/null_functions.rb,
lib/arel_extensions/visitors/mssql.rb,
lib/arel_extensions/visitors/mysql.rb,
lib/arel_extensions/nodes/date_diff.rb,
lib/arel_extensions/nodes/substring.rb,
lib/arel_extensions/nodes/union_all.rb,
lib/arel_extensions/visitors/ibm_db.rb,
lib/arel_extensions/visitors/sqlite.rb,
lib/arel_extensions/visitors/to_sql.rb,
lib/arel_extensions/string_functions.rb,
lib/arel_extensions/boolean_functions.rb,
lib/arel_extensions/nodes/change_case.rb,
lib/arel_extensions/nodes/find_in_set.rb,
lib/arel_extensions/visitors/oracle12.rb,
lib/arel_extensions/visitors/postgresql.rb,
lib/arel_extensions/common_sql_functions.rb,
lib/arel_extensions/nodes/formatted_number.rb,
lib/arel_extensions/visitors/convert_format.rb,
lib/arel_extensions/nodes/aggregate_function.rb,
lib/arel_extensions/nodes/levenshtein_distance.rb
Overview
require ‘oracle_visitor’
Defined Under Namespace
Modules: Aliases, Attributes, BooleanFunctions, Comparators, DateDuration, InsertManager, Math, MathFunctions, Nodes, NullFunctions, Predications, SetFunctions, StringFunctions, Visitors Classes: CommonSqlFunctions, Railtie
Constant Summary collapse
- VERSION =
"2.1.2".freeze
Class Method Summary collapse
- .column_of(table_name, column_name) ⇒ Object
-
.column_of_via_arel_table(table_name, column_name) ⇒ Object
column_of.
Class Method Details
.column_of(table_name, column_name) ⇒ Object
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# File 'lib/arel_extensions/helpers.rb', line 31 def self.column_of(table_name, column_name) use_arel_table = !ActiveRecord::Base.connected? || \ (ActiveRecord::Base.connection.pool.respond_to?(:schema_cache) && ActiveRecord::Base.connection.pool.schema_cache.nil?) if use_arel_table column_of_via_arel_table(table_name, column_name) else if ActiveRecord::Base.connection.pool.respond_to?(:pool_config) ActiveRecord::Base.connection.pool.pool_config.schema_cache.columns_hash(table_name)[column_name] elsif ActiveRecord::Base.connection.pool.respond_to?(:schema_cache) ActiveRecord::Base.connection.pool.schema_cache.columns_hash(table_name)[column_name] else puts ">>> We really shouldn't be here #{table_name}.#{column_name}" column_of_via_arel_table(table_name, column_name) end end end |
.column_of_via_arel_table(table_name, column_name) ⇒ Object
column_of
Before the creation of these methods, getting the column name was done uniquely through the code found in ‘column_of_via_arel_table`.
This turned out to be unreliable, most notably when using adapters that do not come with activerecord standard batteries. SQL Server is the most notorious example.
Currently, we’re using a needlessly complicated way to address this issue. Different versions of activerecord are behaving differently; the public APIs do not seem to come with any guarantees, so we need to be sure that we’re coveing all these cases.
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# File 'lib/arel_extensions/helpers.rb', line 18 def self.column_of_via_arel_table(table_name, column_name) begin Arel::Table.engine.connection.schema_cache.columns_hash(table_name)[column_name] rescue NoMethodError nil rescue Exception => e puts "Failed to fetch column info for #{table_name}.#{column_name} ." puts "This should never be reached." puts "#{e.class}: #{e}" nil end end |