struct Crysda::ColNames

Overview

Struct which is passed to block and provide helpful methods which can be invoked to perform filtering

Defined in:

crysda/select.cr

Constructors

Instance Method Summary

Constructor Detail

def self.new(names) #

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Instance Method Detail

def =~(regex : String) #

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def =~(regex : Regex) #

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def [](from : String, to : String) #

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def [](range : Range(String?, String?)) #

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def all #

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def ends_with?(prefix : String) #

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def except(cols : Array(String)) #

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def except(*cols : String) #

normally, there should be no need for them. We just do positive selection and either use reject or select. BUT: verbs like gather still need to support negative selection Performs a negative selection by selecting all columns except the listed ones.


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def except(&selector : ColumnSelector) #

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def list_of(col_names : Array(String)) #

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def list_of(*col_names : String) #

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def matches(regex : String) #

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def matches(regex : Regex) #

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def names : Array(String) #

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def starts_with?(prefix : String) #

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