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module Guff
class TagModel < Model
SQL = TemplateCache.new({
add_tags: "
INSERT INTO tags(name) VALUES %{tags}
",
get_tags: "
SELECT tag_id,
name
FROM tags
WHERE name IN (%{tags})
",
} of Symbol => String)
def initialize(models : Models)
super(models, SQL)
end
def add_tags(tags : Array(String))
missing_tags = get_missing_tags(tags)
if missing_tags.size > 0
query(:add_tags, nil, {
"tags": missing_tags.map { |tag|
"('" + @db.quote(tag) + "')"
}.join(','),
})
end
end
private def get_missing_tags(
tags : Array(String)
) : Array(String)
# get ids of existing tags
ids = get_ids(tags)
# return missing tags
tags.reject { |tag| ids[tag]? }
end
private def get_ids(
tags = [] of String : Array(String)
) : Hash(String, Int32)
r = {} of String => Int32
all(:get_tags, nil, {
"tags": tags.map { |tag|
"'" + @db.quote(tag) + "'"
}.join(','),
}) do |row|
# add to results
r[row["name"] as String] = row["tag_id"].to_s.to_i
end
# return result
r
end
end
end
|
