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January 15, 2016 07:01
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Sorting, filtering, and searching using the command pattern to apply a list queries to the collection when they meet criteria for usage.
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module Index | |
module_function | |
def call(parent_filter:, search_term:, sort:, direction:) | |
queries = [ | |
filter_query(parent_filter), | |
search_query(search_term), | |
sort_query(sort, direction) | |
] | |
queries.inject(Owner.includes(:user)) do |query,collection| | |
collection.call(query) | |
end | |
end | |
private | |
module_function | |
def noop_call | |
->(collection) { collection } | |
end | |
def sort_query(sort_column, direction) | |
return noop_call unless sort_column | |
sort_direction = direction == 'DESC' ? :desc : :asc | |
->(collection) { collection.order(sort_column => sort_direction) } | |
end | |
def search_query(search_term) | |
return noop_call unless search_term.present? | |
->(collection) { collection.search(search_term) } | |
end | |
def filter_query(parent) | |
return noop_call unless parent? | |
->(collection) { | |
collection | |
.joins(:parent) | |
.where(parents: { id: parent }) | |
} | |
end | |
end |
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